Re: Looking for tips and gotchas for working with Python 3.5 zipapp feature
> The other main limitation (not so much a gotcha as a consequence of > how the OS works) is that you can't load C extensions (pyd or so > files) from a zipfile. If you need to do that, you'll have to bundle > the C extensions to work around that limitation, but that's pretty > advanced usage. > Very interesting post (and one of the only ones on the internet about that... that is why I am posting here even though the thread is quite old). I am exactly in the "pretty advanced usage": I want to create a zip that embed numpy. In this case, I have to bundle the C extension. How can I do that? Thx, Simon -- https://mail.python.org/mailman/listinfo/python-list
__getitem__ on new-style classes
What i'm trying to do is tie special methods of a "proxy" instance
to another instance:
def test1():
class Container:
def __init__( self, data ):
self.data = data
self.__getitem__ = self.data.__getitem__
data = range(10)
c = Container(data)
print "test1"
print c[3]
This works OK. But when I try the same thing on
new style classes:
def test2():
print "test2"
class Container(object):
def __init__( self, data ):
self.data = data
# self.__dict__["__getitem__"] = self.data.__getitem__
self.__setattr__( "__getitem__", self.data.__getitem__ )
data = range(10)
c = Container(data)
print
print c.__getitem__(3) # works OK
print c[3] # fails
I get a "TypeError: unindexable object". It
seems that c[] does not call __getitem__ in this case.
The plot thickens, however, when one tries the following:
def test3():
data = range(10)
c = type( "Container", (), { "__getitem__":data.__getitem__ } )()
print "test3"
print c[3]
Which works fine. However, if I need to resort to
such trickery, no-one here where i work will have any idea
what it does :)
Would anyone like to shed some light on what is going on here ?
bye,
Simon.
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Re: Set literals
+1 from me.
The other possible meaning for {1,2,3} would be {1:None,2:None,3:None},
but that is usually meant to be a set anyway (done with a dict).
So what is this: {1:2, 3, 4 } (apart from "nearly useless") ?
hmmm, thinking a bit more about this, it seems
you can build a set from a dict's keys, but not the other
way around. Is this odd, or what ?
>>> a = set({1:0,2:0,3:0})
>>> a
set([1, 2, 3])
>>>
>>> dict(a)
Traceback (most recent call last):
File "", line 1, in ?
TypeError: cannot convert dictionary update sequence element #0 to a
sequence
Simon.
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how to create an external string when binding C to Python?
I'd like to make a C memory buffer available inside Python via the Python C/API without copying that memory into Python. How to do this? I've read [1] but it's not clear that this functionality exists. In javascript it's possible using String::NewExternal() [2]. "Creates a new external string using the ASCII data defined in the given resource. When the external string is no longer live on V8's heap the resource will be disposed by calling its Dispose method. The caller of this function should not otherwise delete or modify the resource. Neither should the underlying buffer be deallocated or modified except through the destructor of the external string resource." [1] https://docs.python.org/2/c-api/buffer.html [2] http://izs.me/v8-docs/classv8_1_1String.html#a07c47bf675b802c550984fa24511a589 -- https://mail.python.org/mailman/listinfo/python-list
how to create a zero copy external string when binding C to Python?
I'd like to make a C memory buffer available inside Python via the Python C/API without copying that memory into Python. How to do this? I've read [1] but it's not clear that this functionality exists. In javascript it's possible using String::NewExternal() [2]. "Creates a new external string using the ASCII data defined in the given resource. When the external string is no longer live on V8's heap the resource will be disposed by calling its Dispose method. The caller of this function should not otherwise delete or modify the resource. Neither should the underlying buffer be deallocated or modified except through the destructor of the external string resource." [1] https://docs.python.org/2/c-api/buffer.html [2] http://izs.me/v8-docs/classv8_1_1String.html#a07c47bf675b802c550984fa24511a589 -- https://mail.python.org/mailman/listinfo/python-list
Re: per instance descriptors
George Sakkis wrote: > Simon Bunker wrote: > > > Hi I have code similar to this: > > > > class Input(object): > > > > def __init__(self, val): > > self.value = val > > > > def __get__(self, obj, objtype): > > return self.value > > > > def __set__(self, obj, val): > > # do some checking... only accept floats etc > > self.value = val > > > > class Node(object): > > > > a = Input(1) > > b = Input(2) > > > > I realise that a and b are now class attributes - however I want to do this: > > > > node1 = Node() > > node2 = Node() > > > > node1.a = 3 > > node.b = 4 > > > > And have them keep these values per instance. However now node1.a is 4 > > when it should be 3. > > > > Basically I want to have the Input class as a gateway that does lots of > > checking when the attibute is assigned or read. > > > > I have had a look at __getattribute__(), but this gets very ugly as I > > have to check if the attribute is an Input class or not. > > > > Also I don't think property() is appropriate is it? All of the > > attributes will essentially be doing the same thing - they should not > > have individual set/get commands. > > > > Is there any way of doing this nicely in Python? > > What about __setattr__ ? At least from your example, checking happens > only when you set an attribute. If not, post a more representative > sample of what you're trying to do. > > George Yes, but I am setting it in the Node class aren't I? Wouldn't I need to define __setattr__() in class Node rather than class Input? I don't want to do this. Or am I getting confused here? thanks Simon -- http://mail.python.org/mailman/listinfo/python-list
epydoc and latex math
Hi, We have a requirement for latex math (eg. $\sum_i x_i$) in our documentation, and i'm looking at patching epydoc to handle this. We have been using the python doc system (also used by numarray), with a script to rip docstrings into the required latex. However, this method is getting out of hand, and epydoc looks like a great replacement tool. I see nltk and twisted use epydoc, but the project itself seems to be quiet at the moment. Also, I have been subscribed to doc-sig for a while now, but I am utterly confused as to what they are up to. bye, Simon. -- Simon Burton, B.Sc. Licensed PO Box 8066 ANU Canberra 2601 Australia Ph. 61 02 6249 6940 http://arrowtheory.com -- http://mail.python.org/mailman/listinfo/python-list
python unix install, sqlite3
I installed the source code on unix for python 2.5.1. The install went mainly okay, except for some failures regarding: _ssl, _hashlib, _curses, _curses_panel. No errors regarding sqlite3. However, when I start python and do an import sqlite3 I get: /ptmp/bin/> python Python 2.5.1 (r251:54863, May 29 2007, 05:19:30) [GCC 3.3.2] on sunos5 Type "help", "copyright", "credits" or "license" for more information. >>> import sqlite3 Traceback (most recent call last): File "", line 1, in File "/ptmp/Python-2.5.1/lib/python2.5/sqlite3/__init__.py", line 24, in from dbapi2 import * File "/ptmp/Python-2.5.1/lib/python2.5/sqlite3/dbapi2.py", line 27, in from _sqlite3 import * ImportError: No module named _sqlite3 -- http://mail.python.org/mailman/listinfo/python-list
Re: python unix install, sqlite3
On May 29, 7:05 am, vasudevram <[EMAIL PROTECTED]> wrote: > On May 29, 5:52 pm, Simon <[EMAIL PROTECTED]> wrote: > > > > > > > I installed the source code on unix for python 2.5.1. The install went > > mainly okay, except for some failures regarding: > > _ssl, _hashlib, _curses, _curses_panel. > > > No errors regarding sqlite3. > > However, when I start python and do an import sqlite3 I get: > > > /ptmp/bin/> python > > Python 2.5.1 (r251:54863, May 29 2007, 05:19:30) > > [GCC 3.3.2] on sunos5 > > Type "help", "copyright", "credits" or "license" for more information.>>> > > import sqlite3 > > > Traceback (most recent call last): > > File "", line 1, in > > File "/ptmp/Python-2.5.1/lib/python2.5/sqlite3/__init__.py", line > > 24, in > > from dbapi2 import * > > File "/ptmp/Python-2.5.1/lib/python2.5/sqlite3/dbapi2.py", line 27, > > in > > from _sqlite3 import * > > ImportError: No module named _sqlite3 > > Some ideas: > > I don't know if sqlite3 comes bundled with the standard Python source > bundle. My guess is not. If not, that's the cause of the error - you > need to install sqlite3 (and probably pysqlite3 (not sure of the name > (whether it has a trailing 3) which, if I remember, is the Python > binding/wrapper for sqlite3 (which is a C library, I think). Other > possible cause of the error (if sqlite3 _is_ bundled with Python and > no Python binding/wrapper is needed, is that sqlite3 depends on one of > those other libraries you mention (such as _hashlib) for which you got > errors while installing Python from source. > > HTH > Vasudev Ram > Dancing Bison Enterpriseswww.dancingbison.com- Hide quoted text - > > - Show quoted text - Vasudev, Thanks so much for the reply. I went to their website and your guess was correct. Python 2.5 has included support for sqlite but it only includes the PySqlite interface module (now called sqlite3). It does not include sqlite3 with the source distribution. Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: HIRING: PHP Developer
>I apologize. Google groups has restricted our contact email. To reach > us, please send your quote to hiringdivision @ gmail.com. > > Thank you. Apologize to whom? Who/What are you replying to? Please note that we don't all use Google groups format your replies properly. Simon -- http://urlkick.com/ Free URL redirection service. Turns a long URL into a much shorter one. -- http://mail.python.org/mailman/listinfo/python-list
Re: HIRING: PHP Developer
-- http://urlkick.com/ Free URL redirection service. Turns a long URL into a much shorter one. "Lawrence D'Oliveiro" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > In article <[EMAIL PROTECTED]>, > [EMAIL PROTECTED] wrote: > >>We are hiring a PHP developer! > > <http://groups.google.com/[EMAIL PROTECTED] > .co.nz> Or http://urlkick.com/51 :) Simon -- http://mail.python.org/mailman/listinfo/python-list
Wrapping paper, anyone ?
#!/usr/bin/env python
from math import *
from random import *
import cairo
from cairo import Context
Black = (0, 0, 0)
White = (1, 1, 1)
def rand():
return random()*2 - 1
def rotate(theta, x, y):
x, y = x*cos(theta)-y*sin(theta), x*sin(theta)+y*cos(theta)
return x, y
def star(ctx, n=5, r0=0.4):
for c in range(2):
ctx.set_source_rgba(*(White, Black)[c])
x, y = 0, 1
ctx.move_to(x, y)
theta = 2*pi / n
for i in range(n):
x1, y1 = rotate(theta/2, x, y)
ctx.line_to(r0*x1, r0*y1)
x, y = rotate(theta/2, x1, y1)
ctx.line_to(x, y)
ctx.close_path()
(ctx.fill, ctx.stroke)[c]()
class ScribeCall(object):
def __init__(self, scribe, name):
self.scribe = scribe
self.name = name
def __call__(self, *args, **kw):
self.args = args
self.kw = kw
self.scribe.calls.append(self)
class Scribe(object):
def __init__(self):
self.calls = []
__getattr__ = ScribeCall
def run(self, ctx):
for call in self.calls:
#print "ctx.%s(%s)" % (call.name, ', '.join(str(x) for x
in call.args))
getattr(ctx, call.name)(*call.args, **call.kw)
def orbit(dx, dy, w, h):
x = -2*w
while x < 2*w:
y = -2*h
while y < 2*h:
yield x, y
y += dy
x += dx
def main_stars(w=800, h=1000):
seed(0)
surface = cairo.PSSurface('stars.ps', w, h)
ctx = Context(surface)
ctx.set_source_rgba(*White)
ctx.rectangle(0, 0, w, h)
ctx.fill()
ctx.set_line_width(1./30)
scribe = Scribe()
for i in range(10):
scribe.save()
scribe.translate(w*random(), h*random())
scribe.scale(20, 20)
scribe.rotate(random() * 2 * pi)
r = exp(random())
scribe.scale(r, r)
star(scribe, 5)
scribe.scale(1./r, 1./r)
scribe.translate(rand(), rand())
scribe.restore()
for x, y in orbit(120, 240, w, h):
ctx.save()
ctx.translate(x, y)
scribe.run(ctx)
ctx.restore()
if __name__=="__main__":
main_stars()
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Re: Wrapping paper, anyone ?
On Dec 16, 9:00 pm, Peter Otten <__pete...@web.de> wrote: > simon wrote: > > Nice :) > > --- stars.py 2009-12-16 10:52:49.553505036 +0100 > +++ stars_fixed.py 2009-12-16 10:53:32.545786454 +0100 > @@ -48,7 +48,9 @@ > def __init__(self): > self.calls = [] > > - __getattr__ = ScribeCall > + def __getattr__(self, name): > + return ScribeCall(self, name) > + > def run(self, ctx): > for call in self.calls: > #print "ctx.%s(%s)" % (call.name, ', '.join(str(x) for x in > call.args)) > > Peter Oh.. I'm on py2.5.. does this not work for you ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Wrapping paper, anyone ?
On Dec 17, 12:36 am, r0g wrote: > Peter Otten wrote: > > simon wrote: > > > Nice :) > > > --- stars.py 2009-12-16 10:52:49.553505036 +0100 > > +++ stars_fixed.py 2009-12-16 10:53:32.545786454 +0100 > > @@ -48,7 +48,9 @@ > > def __init__(self): > > self.calls = [] > > > - __getattr__ = ScribeCall > > + def __getattr__(self, name): > > + return ScribeCall(self, name) > > + > > def run(self, ctx): > > for call in self.calls: > > #print "ctx.%s(%s)" % (call.name, ', '.join(str(x) for x in > > call.args)) > > > Peter > > Nice :) Now all I need is an A0 printer, maybe Santa will bring me one! > > Roger. I found I could wrap a CD in A4 paper... for bigger things, i might stick some A4 paper together. Wow. Who is getting the A0 gift ? -- http://mail.python.org/mailman/listinfo/python-list
Re: Wrapping paper, anyone ?
On Dec 17, 2:18 am, Peter Otten <__pete...@web.de> wrote:
> simon wrote:
> > On Dec 16, 9:00 pm, Peter Otten <__pete...@web.de> wrote:
> >> simon wrote:
>
> >> Nice :)
>
> >> --- stars.py 2009-12-16 10:52:49.553505036 +0100
> >> +++ stars_fixed.py 2009-12-16 10:53:32.545786454 +0100
> >> @@ -48,7 +48,9 @@
> >> def __init__(self):
> >> self.calls = []
>
> >> - __getattr__ = ScribeCall
> >> + def __getattr__(self, name):
> >> + return ScribeCall(self, name)
> >> +
> >> def run(self, ctx):
> >> for call in self.calls:
> >> #print "ctx.%s(%s)" % (call.name, ', '.join(str(x) for x in
> >> call.args))
>
> >> Peter
>
> > Oh.. I'm on py2.5.. does this not work for you ?
>
> You mean 2.4? Here's a little demo:
>
> $ cat scribecall.py
> class ScribeCall(object):
> def __init__(self, scribe, name):
> print "init", scribe, name
> def __call__(self, *args, **kw):
> print "call", args, kw
>
> class Scribe(object):
> __getattr__ = ScribeCall
>
> if __name__ == "__main__":
> scribe = Scribe()
> scribe.yadda(42)
>
> $ python2.4 scribecall.py
> init <__main__.Scribe object at 0x7fc87b9a1450> yadda
> call (42,) {}
>
> $ python2.5 scribecall.py
> Traceback (most recent call last):
> File "scribecall.py", line 12, in
> scribe.yadda(42)
> TypeError: __init__() takes exactly 3 arguments (2 given)
>
> $ python2.5 -V
> Python 2.5.4
>
> $ python2.6 scribecall.py
> Traceback (most recent call last):
> File "scribecall.py", line 12, in
> scribe.yadda(42)
> TypeError: __init__() takes exactly 3 arguments (2 given)
>
> Peter
Oh wow, it works on python 2.5.2 !
Simon.
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Re: ftp and python
You could user FTP.voidcmd()
E.G.
ftp.voidcmd('RNFT filename.txt')ftp.voidcmd('RNTO newdir/filename.txt')
>From the rfc:
RENAME FROM (RNFR)
This command specifies the old pathname of the file which is
to be renamed. This command must be immediately followed by
a "rename to" command specifying the new file pathname.
RENAME TO (RNTO)
This command specifies the new pathname of the file
specified in the immediately preceding "rename from"
command. Together the two commands cause a file to be
renamed.
P.S. Sorry about emailing that direct to you John :(
On 8 April 2010 07:24, John Nagle wrote:
> Tim Chase wrote:
>
>> Matjaz Pfefferer wrote:
>>
>>> What would be the easiest way to copy files from one ftp
>>> folder to another without downloading them to local system?
>>>
>>
>> As best I can tell, this isn't well-supported by FTP[1] which doesn't seem
>> to have a native "copy this file from server-location to server-location
>> bypassing the client". There's a pair of RNFR/RNTO commands that allow you
>> to rename (or perhaps move as well) a file which ftplib.FTP.rename()
>> supports but it sounds like you want too copies.
>>
>
> In theory, the FTP spec supports "three-way transfers", where the
> source, destination, and control can all be on different machines.
> But no modern implementation supports that.
>
>John Nagle
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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Re: Python dot-equals (syntax proposal)
Hay I got a better idea. If you put two dots (..) on a line by itself it
means
execute the previous line again!
On 1 May 2010 07:08, Patrick Maupin wrote:
> On Apr 30, 11:04 am, Jabapyth wrote:
> > At least a few times a day I wish python had the following shortcut
> > syntax:
> >
> > vbl.=func(args)
> >
> > this would be equivalent to
> >
> > vbl = vbl.func(args)
> >
> > example:
> >
> > foo = "Hello world"
> > foo.=split(" ")
> > print foo
> > # ['Hello', 'world']
> >
> > and I guess you could generalize this to
> >
> > vbl.=[some text]
> > #
> > vbl = vbl.[some text]
> >
> > e.g.
> >
> > temp.=children[0]
> > # temp = temp.children[0]
> >
> > thoughts?
>
> First thought: good luck getting something like this through.
> Probably not going to happen, although I do find the idea very
> intriguing.
>
> Second thought: I don't like the proposed syntax at all.
>
> +=, -=, /=, *=, etc. conceptually (and, if lhs object supports in-
> place operator methods, actually) *modify* the lhs object.
>
> Your proposed .= syntax conceptually *replaces* the lhs object
> (actually, rebinds the lhs symbol to the new object).
>
> If this were to be deemed worthy of the language, I would think a
> better syntax would be something like:
>
> mystring = .upper()
> mystring = .replace('a', 'b')
>
> etc.
>
> The '=' shows clearly that mystring is being rebound to a new object.
>
> As Steven has shown, '.' functions as an operator, so if this change
> were accepted, in reality you would probably be able to write:
>
> mystring = . upper()
> mystring=.upper()
>
> or whatever. But the canonical form would probably be with a space
> before the period but not after.
>
> Regards,
> Pat
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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install Python-2.4.4 from source (parallel to existing Python-2.6)
edexter wrote: simon wrote: Hi everybody, The situation: I wrote a GUI, based on Python, TkInter and Pmw. It runs perfectly fine with Python 2.4 (providing, TkInter and Pmw are installed). But it crashes with Python 2.6. I tried this on MacOSX11.4 and various Linux Distributions. Crashes occurs when I activate a Pmw.Diaog (I guess this is due to a bug in the installed blt package), also when I use setitems on Pmw.OptionMenu (I guess this is due to another package, associated with tcl/tk). The target: I have to get my GUI work under openSUSE 11.1 (x86_64). My plan: On my openSUSE 11.1 (x86_64), Python 2.6 is installed by default. I would like to know, how to install Python 2.4 along with TkInter and Pmw (and packages that are required by them), parallel to the existing Python 2.6. So that I do not break other software that depends on Python 2.6. If you can think of another plan, I would be also glad to discuss it. Cheers, Simon I suspect you want to install python 2.4 and then reinstall 2.6 I did that in windows and I don't understand why it wouldn't work in linux I'm afraid, installation is quit different under UNIX based systems and Windows. I installed Python-2.4.4.tar.bz2 from python.org, using gcc-4.3 (within openSUSE 11.1 x86_64) via 'make altinstall'. First, I tried to configure with the following flags: --prefix=/opt/python-24 --enable-framework --with-pydebug This provoked an error during compilation via make (sorry, the list was so long, but I will post it, if it helps). Second, configured again without any flags. The installation by 'make altinstall' to /usr/local was a success. Python2.6 seams unaffected, too. So, I got my parallel installation. However, I cannot import modules like Tkinter or readline within python2.4. For example, Tkinter.py is located in /usr/local/lib/python2.4/lib-tk sys.path says: ['', '/usr/local/lib/python24.zip', '/usr/local/lib/python2.4', '/usr/local/lib/python2.4/plat-linux2', '/usr/local/lib/python2.4/lib-tk', '/usr/local/lib/python2.4/lib-dynload', '/usr/local/lib/python2.4/site-packages'] sys.prefix and sys.exec_prefix say: '/usr/local' my bash's PATH variable says: /sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib64/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin Which configuration step did I miss after my Python2.4 installation? What did I do wrong? Cheers, Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: install Python-2.4.4 from source (parallel to existing Python-2.6)
Simon wrote: edexter wrote: simon wrote: Hi everybody, The situation: I wrote a GUI, based on Python, TkInter and Pmw. It runs perfectly fine with Python 2.4 (providing, TkInter and Pmw are installed). But it crashes with Python 2.6. I tried this on MacOSX11.4 and various Linux Distributions. Crashes occurs when I activate a Pmw.Diaog (I guess this is due to a bug in the installed blt package), also when I use setitems on Pmw.OptionMenu (I guess this is due to another package, associated with tcl/tk). The target: I have to get my GUI work under openSUSE 11.1 (x86_64). My plan: On my openSUSE 11.1 (x86_64), Python 2.6 is installed by default. I would like to know, how to install Python 2.4 along with TkInter and Pmw (and packages that are required by them), parallel to the existing Python 2.6. So that I do not break other software that depends on Python 2.6. If you can think of another plan, I would be also glad to discuss it. Cheers, Simon I suspect you want to install python 2.4 and then reinstall 2.6 I did that in windows and I don't understand why it wouldn't work in linux I'm afraid, installation is quit different under UNIX based systems and Windows. I installed Python-2.4.4.tar.bz2 from python.org, using gcc-4.3 (within openSUSE 11.1 x86_64) via 'make altinstall'. First, I tried to configure with the following flags: --prefix=/opt/python-24 --enable-framework --with-pydebug This provoked an error during compilation via make (sorry, the list was so long, but I will post it, if it helps). Second, configured again without any flags. The installation by 'make altinstall' to /usr/local was a success. Python2.6 seams unaffected, too. So, I got my parallel installation. However, I cannot import modules like Tkinter or readline within python2.4. For example, Tkinter.py is located in /usr/local/lib/python2.4/lib-tk sys.path says: ['', '/usr/local/lib/python24.zip', '/usr/local/lib/python2.4', '/usr/local/lib/python2.4/plat-linux2', '/usr/local/lib/python2.4/lib-tk', '/usr/local/lib/python2.4/lib-dynload', '/usr/local/lib/python2.4/site-packages'] sys.prefix and sys.exec_prefix say: '/usr/local' my bash's PATH variable says: /sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib64/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin Which configuration step did I miss after my Python2.4 installation? What did I do wrong? Cheers, Simon OK, I found an 'Ansatzpunkt' where I can start from: _tkinter.so is missing in /usr/local/lib/python2.4/lib-dynload so I guess my python is not configured for using Tcl? I found the following from http://mail.python.org/pipermail/python-list/2001-December/117984.html Install Tcl, Tk and Python as peers of each other ... 1. run configure in Python 2. make and make install Tcl (unless you're using binary dist)make and 3. make install Tk (unless you're using binary dist) 4. edit Setup 5. make and make install Python I guess, I will try that next. Maybe somebody knows a more detailed instruction. My problems: a) I don't know if I have to set special flags to make the three packages aware of each other during 'configure', 'make', and 'make altinstall'. b) Also, I don't know, which setup do I have to edit during step 4. c) Which Tcl and Tk versions do I need, don't I need tcl-devel in addition? Sorry for so many questions, but this stuff is new for me, Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: install Python-2.4.4 from source (parallel to existing Python-2.6)
Benjamin Kaplan wrote:
On Fri, Jun 12, 2009 at 9:31 AM, Simon <mailto:simon...@gmx.de>> wrote:
edexter wrote:
simon wrote:
Hi everybody,
The situation:
I wrote a GUI, based on Python, TkInter and Pmw.
It runs perfectly fine with Python 2.4 (providing, TkInter
and Pmw are
installed). But it crashes with Python 2.6. I tried this on
MacOSX11.4
and various Linux Distributions.
Crashes occurs when I activate a Pmw.Diaog (I guess this is
due to a bug
in the installed blt package), also when I use setitems on
Pmw.OptionMenu (I guess this is due to another package,
associated with
tcl/tk).
The target:
I have to get my GUI work under openSUSE 11.1 (x86_64).
My plan:
On my openSUSE 11.1 (x86_64), Python 2.6 is installed by
default.
I would like to know, how to install Python 2.4 along with
TkInter and
Pmw (and packages that are required by them), parallel to
the existing
Python 2.6. So that I do not break other software that
depends on Python
2.6.
If you can think of another plan, I would be also glad to
discuss it.
Cheers,
Simon
I suspect you want to install python 2.4 and then reinstall 2.6
I did
that in windows and I don't understand why it wouldn't work in linux
I'm afraid, installation is quit different under UNIX based systems
and Windows.
I installed Python-2.4.4.tar.bz2 from python.org
<http://python.org>, using gcc-4.3 (within openSUSE 11.1 x86_64) via
'make altinstall'.
First, I tried to configure with the following flags:
--prefix=/opt/python-24 --enable-framework --with-pydebug
This provoked an error during compilation via make (sorry, the list
was so long, but I will post it, if it helps).
The --enable-framework option is for creating Framework builds on OS X.
It won't work on Linux.
Second, configured again without any flags. The installation by
'make altinstall' to /usr/local was a success. Python2.6 seams
unaffected, too. So, I got my parallel installation.
However, I cannot import modules like Tkinter or readline within
python2.4.
For example, Tkinter.py is located in /usr/local/lib/python2.4/lib-tk
sys.path says: ['', '/usr/local/lib/python24.zip',
'/usr/local/lib/python2.4', '/usr/local/lib/python2.4/plat-linux2',
'/usr/local/lib/python2.4/lib-tk',
'/usr/local/lib/python2.4/lib-dynload',
'/usr/local/lib/python2.4/site-packages']
sys.prefix and sys.exec_prefix say: '/usr/local'
my bash's PATH variable says:
/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/X11R6/bin:/usr/games:/opt/kde3/bin:/usr/lib64/jvm/jre/bin:/usr/lib/mit/bin:/usr/lib/mit/sbin
Which configuration step did I miss after my Python2.4 installation?
What did I do wrong?
Again, give us the error message. We can't help if we don't know exactly
what's going on.
Sorry, here it comes:
Python 2.4.4 (#1, Jun 12 2009, 14:11:55)
[GCC 4.3.2 [gcc-4_3-branch revision 141291]] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Traceback (most recent call last):
File "/etc/pythonstart", line 7, in ?
import readline
ImportError: No module named readline
>>> import Tkinter
Traceback (most recent call last):
File "", line 1, in ?
File "/usr/local/lib/python2.4/lib-tk/Tkinter.py", line 38, in ?
import _tkinter # If this fails your Python may not be configured
for Tk
ImportError: No module named _tkinter
Right know, I'm following Christian's hint, to "install the development
library of tk, readline, zlib and libbz2 prior to configure && make",
because the following essential packages were not installed on my system:
autoconf automake libbz2-devel libopenssl-devel libtool ncurses-devel
readline-devel sqlite2-devel tack tcl-devel tk-devel zlib-devel
I will let you know about the result, soon.
Cheers,
Simon
--
http://mail.python.org/mailman/listinfo/python-list
Re: install Python-2.4.4 from source (parallel to existing Python-2.6)
Christian Heimes wrote: Simon schrieb: Christian Heimes wrote: Simon wrote: I installed Python-2.4.4.tar.bz2 from python.org, using gcc-4.3 (within openSUSE 11.1 x86_64) via 'make altinstall'. First, I tried to configure with the following flags: --prefix=/opt/python-24 --enable-framework --with-pydebug This provoked an error during compilation via make (sorry, the list was so long, but I will post it, if it helps). --enable-framework is for Mac OS X only. Second, configured again without any flags. The installation by 'make altinstall' to /usr/local was a success. Python2.6 seams unaffected, too. So, I got my parallel installation. You have chosen the correct and canonical way to install a parallel installation of Python. However, I cannot import modules like Tkinter or readline within python2.4. You must install the development library of tk, readline, zlib and libbz2 prior to configure && make. Try this on your box: zypper install gcc make autoconf automake libtool zlib-devel readline-devel tk-devel tcl-devel sqlite2-devel libbz2-devel libopenssl-devel Unfortunately, I got the following errors, while compiling via make. Please, see attached text file for details about everything I did from installing the missing packages via zypper until make. zypper should have installed all necessary dependencies, including a whole bunch of X11 headers. Something seems to be wrong on your system or SuSE's package dependencies. I know why I dislike SuSE. :) Although I started my Linux career 12 years ago with SuSE I prefer Debian based systems since Woody came out in 2002. :) X11 says: Program 'X11' is present in package 'xorg-x11', which is installed on your system. zypper search X11 | grep devel ... zypper install xorg-x11-devel That should (hopefully) do the trick. On a Debian based systems it's much easier to install all Python dependencies with "apt-get build-dep python2.5" To quote SuSE: "Have a lot of fun ..." Und viel Glück! Christian Danke :) On Monday, I will be able to tell if it worked out, or if I have to try a new strategy, e.g. to convince the admin about (K)ubuntu. -- http://mail.python.org/mailman/listinfo/python-list
Newbie Question regarding __init__()
Hi
I want to create an instance of dcCursor which inherits from
dcObject. When I run the following code it gives the error shown.
Can some explain to me what is wrong? I have included the dcObject.py
and dcCursor.py below.
>>>import dcObject
>>> import dcCursor
>>> x = dcCursor.dcCursor()
Traceback (most recent call last):
File "", line 1, in
TypeError: __init__() takes no arguments (1 given)
# -*- coding: utf-8 -*-
# dcCursor.py - The base Cursor Class
from dcObject import dcObject
class dcCursor(dcObject):
"""The base Cursor Class"""
def OpenCursor(tcTemp,tcTable):
"""Opens the specified cursor
Parameters: tcTemp,tcTable"""
pass
def CreateCursor(tcTable):
"""Creates the specified cursor
Parameters: tcTable"""
pass
def init_Exec():
print("init_Exec called")
# -*- coding: utf-8 -*-
# dcObject.py - Base Object
class dcObject(object):
"""Base Object"""
def __init__():
"""default init method has the form
of init_Pre() and init_Exec
init_Post()"""
self.init_Pre() and self.init_Exec()
self.init_Post()
def init_Pre():
"""Always called before init_Exec()
if it returns false init_Exec is
not executed"""
return True
def init_Exec():
"""Base __init__ code goes here and this is
only executed if init_Pre() returns true"""
return True
def init_Post():
"""Always called after the init_Pre() and
init_Exec()"""
return True
--
http://mail.python.org/mailman/listinfo/python-list
Re: Newbie Question regarding __init__()
Hi So should the dcObject class include the "self" as well since I have not defined an __init__ method in dcCursor? Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie Question regarding __init__()
Okay I will fix my code and include "self" and see what happens. I know I tried that before and got another error which I suspect was another newbie error. The idea behind the init_Pre is that I can put custom code here to customize the __init__ instead of creating a new subclass. This kind of hook pattern allows you to flatten your inheritance hierarchy. I can choose in the init_Pre method to execute code before the init_exec (which contains the default __init__ code) and still execute the init_Exec method or I can completely customize the entire __init__ by returning False from init_Pre and prevent the init_Exec from being called. I use this type of pattern with almost all my methods. In this way I can create a less complicated inheritance chain but still have have custom code when needed without sub-classing. I am use to Visual FoxPro which where you can do =This.init_Pre().And.This.init_Exec() and the result is discarded so that is why it looks the way it does. In this form init_Exec has to return a value. However, If self.init_Pre(): self.init_Exec() would work the same and then I could avoid returning a value. Thanks, Simon On Aug 1, 5:52 am, Dave Angel wrote: > Nat Williams wrote: > > As MRAB described, ALL instance methods need to accept 'self' as a first > > parameter, as that will be passed to them implicitly when they are called. > > This includes __init__. The name 'self' is just a commonly accepted > > convention for the name of the instance object passed to methods. You don't > > have to call it that, but you really should. > > > Take a look athttp://docs.python.org/tutorial/classes.html#class-objects > > It might help shed some light on how methods and instances work. > > > One other thing. I'm a little confused by the first line of > > dcObject.__init__: > > > self.init_Pre() and self.init_Exec() > > > I suspect this does not do what you think it does. init_Pre and init_Exec > > will both be called by this expression (unless init_Pre throws an exception, > > of course). You're not getting anything here that you wouldn't by just > > calling each method on a separate line, except just making it harder to > > read. > > Read the doc-string for init_Pre() and for init_Exec(). The final > version of init_Pre() will return False in some circumstances, and in > those circumstances Simon doesn't want init_Exec() to be called. He's > deliberately using the short-circuit evaluation of 'and' to accomplish > that. > > > > > > > > > On Fri, Jul 31, 2009 at 8:53 PM, Simon wrote: > > >> Hi > > >> So should the dcObject class include the "self" as well since I have > >> not defined an __init__ method in dcCursor? > > >> Simon > > >> -- > >>http://mail.python.org/mailman/listinfo/python-list > > Every one of those methods in both of those classes need a "self" first > argument. As others have said, all instance methods need a 'self.' -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie Question regarding __init__()
On Aug 2, 5:51 am, Dave Angel wrote: > Simon wrote: > > Okay I will fix my code and include "self" and see what happens. I > > know I tried that before and got another error which I suspect was > > another newbie error. > > > The idea behind the init_Pre is that I can put custom code here to > > customize the __init__ instead of creating a new subclass. This kind > > of hook pattern allows you to flatten your inheritance hierarchy. I > > can choose in the init_Pre method to execute code before the init_exec > > (which contains the default __init__ code) and still execute the > > init_Exec method or I can completely customize the entire __init__ by > > returning False from init_Pre and prevent the init_Exec from being > > called. I use this type of pattern with almost all my methods. In > > this way I can create a less complicated inheritance chain but still > > have have custom code when needed without sub-classing. > > > I am use to Visual FoxPro which where you can do > > > =is.init_Pre().And.This.init_Exec() and the result is discarded so > > that is why it looks the way it does. In this form init_Exec has to > > return a value. However, If self.init_Pre(): self.init_Exec() would > > work the same and then I could avoid returning a value. > > > Thanks, > > Simon > > > On Aug 1, 5:52 am, Dave Angel wrote: > > >> Nat Williams wrote: > > >>> As MRAB described, ALL instance methods need to accept 'self' as a first > >>> parameter, as that will be passed to them implicitly when they are called. > >>> This includes __init__. The name 'self' is just a commonly accepted > >>> convention for the name of the instance object passed to methods. You > >>> don't > >>> have to call it that, but you really should. > > >>> Take a look athttp://docs.python.org/tutorial/classes.html#class-objects > >>> It might help shed some light on how methods and instances work. > > >>> One other thing. I'm a little confused by the first line of > >>> dcObject.__init__: > > >>> self.init_Pre() and self.init_Exec() > > >>> I suspect this does not do what you think it does. init_Pre and init_Exec > >>> will both be called by this expression (unless init_Pre throws an > >>> exception, > >>> of course). You're not getting anything here that you wouldn't by just > >>> calling each method on a separate line, except just making it harder to > >>> read. > > >> Read the doc-string for init_Pre() and for init_Exec(). The final > >> version of init_Pre() will return False in some circumstances, and in > >> those circumstances Simon doesn't want init_Exec() to be called. He's > >> deliberately using the short-circuit evaluation of 'and' to accomplish > >> that. > > >>> On Fri, Jul 31, 2009 at 8:53 PM, Simon wrote: > > >>>> Hi > > >>>> So should the dcObject class include the "self" as well since I have > >>>> not defined an __init__ method in dcCursor? > > >>>> Simon > > >>>> -- > >>>>http://mail.python.org/mailman/listinfo/python-list > > >> Every one of those methods in both of those classes need a "self" first > >> argument. As others have said, all instance methods need a 'self.' > > (Please don't top-post. You should put new responses at the end of > quoted text, or sometimes inline if that's clearer.) > > I don't understand your comparison to Foxpro. read on. > > As your code was last posted, you don't need a return value from > init_Exec() Every function that doesn't have an explicit return will > return None. And None is interpreted as False in an "and" expression. > If you had an "if" around the whole thing, then you'd care. > > DaveA All I meant by the FoxPro comment was the idea of using the equal sign without a variable to throw away the result. Also in FoxPro there is no such thing as automatically returning None. If there is no explicit return then True is returned. Thanks I did not know that None is interpreted as False. Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Newbie Question regarding __init__()
On Aug 3, 11:00 pm, Dave Angel wrote: > Simon wrote: > > On Aug 2, 5:51 am, Dave Angel wrote: > > >> > >> I don't understand your comparison to Foxpro. read on. > > >> As your code was last posted, you don't need a return value from > >> init_Exec() Every function that doesn't have an explicit return will > >> return None. And None is interpreted as False in an "and" expression. > >> If you had an "if" around the whole thing, then you'd care. > > >> DaveA > > > All I meant by the FoxPro comment was the idea of using the equal sign > > without a variable to throw away the result. Also in FoxPro there is > > no such thing as automatically returning None. If there is no > > explicit return then True is returned. > > > Thanks I did not know that None is interpreted as False. > > > Simon > > To throw away the result of an expression in Python is even easier. > Just don't use it. > func1() and func2() > is a valid expression whose result is not used. And func2()'s result is > therefore irrelevant. But shortcircuiting means that func2() is only > called if func1() returned False (or something equivalent to it, like 0 > or an empty list) Thanks for telling me how Python throws away the result. Secondly my code works perfectly now that I am properly defining my methods using "self". -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: eGenix PyRun - One file Python Runtime 1.0.0
On 02/07/12 23:52, eGenix Team: M.-A. Lemburg wrote: ANNOUNCING eGenix PyRun - One file Python Runtime Version 1.0.0 An easy-to-use single file relocatable Python run-time - available for Windows, Mac OS X and Unix platforms This announcement is also available on our web-site for online reading: http://www.egenix.com/company/news/eGenix-PyRun-1.0.0.html INTRODUCTION Our new eGenix PyRun combines a Python interpreter with an almost complete Python standard library into a single easy-to-use executable, that does not require a system wide installation and is fully relocatable. eGenix PyRun's executable only needs 12MB, but still supports most Python application and scripts - and it can be further compressed to 3-4MB using gzexe or upx. Compared to a regular Python installation of typically 100MB on disk, this makes eGenix PyRun ideal for applications and scripts that need to be distributed to many target machines, client installations or customers. It makes "installing" Python on a Unix based system as simple as copying a single file. http://www.egenix.com/products/python/PyRun/ NEWS This is the first public release of eGenix PyRun. We have been using the product internally in our mxODBC Connect Server since 2008 with great success and have now extracted it into a stand-alone open-source product. We provide both the source archive to build your own eGenix PyRun, as well as provide pre-compiled binaries for Linux, FreeBSD and Mac OS X, for the resp. 32- and 64-bit platforms. Presentation at EuroPython 2012 --- Marc-André, CEO of eGenix, will be giving a presentation about eGenix PyRun at EuroPython 2012 in Florence, Italy on Wednesday, July 4th in the Room Tagliatelle. He will also be available during the conference to answer questions. DOWNLOADS The download archives and instructions for installing the product can be found at: http://www.egenix.com/products/python/PyRun/ ___ SUPPORT Commercial support for these packages is available from eGenix.com. Please see http://www.egenix.com/services/support/ for details about our support offerings. MORE INFORMATION For more information about eGenix PyRun, licensing and download instructions, please visit our web-site or write to sa...@egenix.com. Enjoy, Hello, Are you able to indicate what size the installation would be WITH ALL the mentioned dependencies on various typical systems (MS Windows 32/64, Ubuntu, etc)? Saying something is only 12-13 MB in size is one thing but noting that you need 283MB+* of other packages means that in order to get this package to work on another machine you would need to install more than a 12-13MB executable, particularly on a Windows machine. OpenSSL on Windows 20MB -- http://slproweb.com/products zlib binary on Windows 0.012MB-- /Win32OpenSSL.html -- http://gnuwin32.sourceforge.net/packages/zlib.htm SQLite binary for Windows 262.59 MB -- http://www.sqlite.org/download.html/ BZip tarball 0.75 MB -- http://www.bzip.org/downloads.html Also, do you have a page that indicates what standard libraries have been included? How can someone tell whether they would need to distribute or include any additional modules to get a script to work? -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: code review
On 04/07/12 13:53, Chris Angelico wrote: On Wed, Jul 4, 2012 at 12:57 PM, wrote: Well, if you waited until you had the password (however long) in a variable before you applied your maximum limits, the DoS ship has probably sailed already. Only because data transfer is usually more expensive than hashing. But I'd say that'll always be true. ChrisA Some questions to Tyler Littlefield, who started this thread. Q1 -- Did you get any constructive feedback on your code? Q2 -- Did you feel that the process of submitting your code for review met your expectation? Q3 -- Would you recommend others doing this either on this forum or other fora? It appears to me - third party watching the ongoing dialog - that the tread has gone right off topic (some time ago) and someone should really start a new thread under a new title/subject. Most of what I have read does not appear to be discussing your code or how you could improve your code. Following the last few posts, I was wondering whether some other off-list dialog is going on or whether I am missing something. -- Cheers Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Apology for OT posts
On 06/07/12 12:06, John O'Hagan wrote: On Tue, 03 Jul 2012 23:39:20 -0600 "Littlefield, Tyler" wrote: On 7/3/2012 10:55 PM, Simon Cropper wrote: Some questions to Tyler Littlefield, who started this thread. Q1 -- Did you get any constructive feedback on your code? I did get some, which I appreciated. someone mentioned using PyLint. From reading, I found it was really really pedantic, so I used PyFlakes instead. Q2 -- Did you feel that the process of submitting your code for review met your expectation? There wasn't much more to review, so yes. The info I got was helpful and farther than it was before I started. Q3 -- Would you recommend others doing this either on this forum or other fora? It appears to me - third party watching the ongoing dialog - that the tread has gone right off topic (some time ago) and someone should really start a new thread under a new title/subject. Most of what I have read does not appear to be discussing your code or how you could improve your code. I basically just stopped after a while. It got into a my language is better than your language, so I didn't see much constructive info. I've started reading from the bottom though, where it looks like it's back, and I do appreciate the rest of the info given, as well. Thanks again for the feedback. As one of the perpetrators, I did apologise for being OT within the body of my replies to OT posts, but I see the irony. I guess I just thought somebody else would do it eventually. I hereby apologise for not taking the correct action, and vow to do so in future: to change the subject line regardless of who initially went OT, starting now. Regards, -- John thanks :) bet this kills the conservation though... Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: PollyReports 1.5 -- Band-oriented PDF Report Generator
On 12/07/12 00:06, Chris Gonnerman wrote: I've held off announcing this until I was sure it was really stable; it's been 19 days since I made the last change to it, so here goes. PollyReports is my Python module for report generation. It is designed to be, quite literally, the "simplest thing that can possibly work" in the field of PDF generation from a database record set. There is a somewhat vague resemblance to GeraldoReports; I had problems with Geraldo's pagination which led me to develop PollyReports in a brief flurry of intense activity. It's on PyPI: http://pypi.python.org/pypi/PollyReports and on Github: https://github.com/Solomoriah/PollyReports and I have a blog where I talk about it (like anyone cares): http://opensource.gonnerman.org/?cat=4 "I've noticed that acceptance of a new software module or package for developers in the Open Source/Free Software world is greatly affected by the availability of a good tutorial. I mean, it seems obvious, doesn't it? But I've also noticed that the original author of a project rarely writes a good tutorial." http://packages.python.org/PollyReports/tutorial.html Well I thought it was a good tutorial. It certainly empowers me with enough confidence to give it a try. That said... with more than a passing interest in software and content licensing I looked at how the work was licensed. A none-standard license like this makes most people stop and think "will this be a problem if I use this in my work?" How compatible is your license with the main software licenses currently available? -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: my email
On 18/07/12 11:44, Maria Hanna Carmela Dionisio wrote: mmdionisio1...@yahoo.com.ph Just a newbhie here :> [snip] You must know your password to change your options (including changing the password, itself) or to unsubscribe. It is: sweet103093 I suggest you change you password now that you have told the world what it is. -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: Finding duplicate file names and modifying them based on elements of the path
On 19/07/12 08:20, larry.mart...@gmail.com wrote: I have an interesting problem I'm trying to solve. I have a solution almost working, but it's super ugly, and know there has to be a better, cleaner way to do it. I have a list of path names that have this form: /dir0/dir1/dir2/dir3/dir4/dir5/dir6/file I need to find all the file names (basenames) in the list that are duplicates, and for each one that is a dup, prepend dir4 to the filename as long as the dir4/file pair is unique. If there are multiple dir4/files in the list, then I also need to add a sequence number based on the sorted value of dir5 (which is a date in ddMONyy format). For example, if my list contains: /dir0/dir1/dir2/dir3/qwer/09Jan12/dir6/file3 /dir0/dir1/dir2/dir3/abcd/08Jan12/dir6/file1 /dir0/dir1/dir2/dir3/abcd/08Jan12/dir6/file2 /dir0/dir1/dir2/dir3/xyz/08Jan12/dir6/file1 /dir0/dir1/dir2/dir3/qwer/07Jan12/dir6/file3 Then I want to end up with: /dir0/dir1/dir2/dir3/qwer/09Jan12/dir6/qwer_01_file3 /dir0/dir1/dir2/dir3/abcd/08Jan12/dir6/abcd_file1 /dir0/dir1/dir2/dir3/abcd/08Jan12/dir6/file2 /dir0/dir1/dir2/dir3/xyz/08Jan12/dir6/xyz_file1 /dir0/dir1/dir2/dir3/qwer/07Jan12/dir6/qwer_00_file3 My solution involves multiple maps and multiple iterations through the data. How would you folks do this? Hi Larry, I am making the assumption that you intend to collapse the directory tree and store each file in the same directory, otherwise I can't think of why you need to do this. If this is the case, then I would... 1. import all the files into an array 2. parse path to extract forth level directory name and base name. 3. reiterate through the array 3.1 check if base filename exists in recipient directory 3.2 if not, copy to recipient directory 3.3 if present, append the directory path then save 3.4 create log of success or failure Personally, I would not have some files with abcd_file1 and others as file2 because if it is important enough to store a file in a separate directory you should also note where file2 came from as well. When looking at your results at a later date you are going to have to open file2 (which I presume must record where it relates to) to figure out where it came from. If it is in the name it is easier to review. In short, consistency is the name of the game; if you are going to do it for some then do it for all; and finally it will be easier for others later to work out what you have done. -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: dbf.py 0.94
On 21/07/12 09:59, Ethan Furman wrote: Getting closer to a stable release. Latest version has a simpler, cleaner API, and works on PyPy (and hopefully the other implementations as well ;), as well as CPython. Get your copy at http://python.org/pypi/dbf. Bug reports, comments, and kudos welcome! ;) ~Ethan~ Question 1 - What version of VFP will dbf work with? Is VFP9 OK? Question 2 - You statement of compatibility is unclear. Works with PyPy, OK. Hopefully works with other implementations, Hm, what does this mean? Works or hopefully works with CPython -- which is it? -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
PyPy, is it a 1:1 replacement for CPython?
Hi, Can you use PyPy as a direct replacement for the normal python or is it a specialized compiler that can only work with libraries that are manipulated to operate within its constraints (if it has any). Are there any issues with using PyPy? For example, if programs are created under PyPy are they subtle different from normal code that would make the program incompatible with the normal compiler? -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
append in IMAP4 from imaplib very slow
Hi, I'm currently experimenting with IMAP using Python 2.7.3 and IMAP4 from imaplib. I noticed the performance to be very bad. I read 5000 files from a directory and append them to an IMAP INBOX. The hole procedure of reading and appending is taking about 210 seconds. I set up the exact same code in Perl to check if there is a general IMAP server configuration issue, since CPU and I/O isn't the problem. The same amount of data on the same IMAP server is done after 7.9 seconds using Perl. The difference is huge and I tried to narrow the issue down by profiling the Python code. The profile results are, 206 seconds are spent in calling socket.recv. Python Code: <http://pastebin.com/EWnfpsZB>http://pastebin.com/d2c9d4Dx Profile Result: http://pastebin.com/rWCS8tAz Perl Code: http://pastebin.com/ZV3Yv74d Maybe someone can explain what's the problem, or help me debugging the issue. Thanks, Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: append in IMAP4 from imaplib very slow
On 07/26/2012 05:21 AM, Tim Chase wrote: On 07/25/12 12:47, Simon Pirschel wrote: I'm currently experimenting with IMAP using Python 2.7.3 and IMAP4 from imaplib. I noticed the performance to be very bad. I read 5000 files from a directory and append them to an IMAP INBOX. The hole procedure of reading and appending is taking about 210 seconds. I set up the exact same code in Perl to check if there is a general IMAP server configuration issue, since CPU and I/O isn't the problem. The same amount of data on the same IMAP server is done after 7.9 seconds using Perl. The difference is huge and I tried to narrow the issue down by profiling the Python code. The profile results are, 206 seconds are spent in calling socket.recv. While I don't know the ins and outs of the Perl code, it looks like the Python imaplib.py is doing some pretty straight-forward send/receive work. However, IMAP4 does support both pipelining and multi-append extensions, so if the Perl code takes advantage of the features if the server offers them, it might be reaping significant gains over the naïve Python code. Can you get a debugging dump of the commands being sent each way? (particularly if you see a bunch of APPEND commands before the reply acknowledgement, as detailed at [1]) -tkc [1] http://www.ietf.org/rfc/rfc3502.txt on page 4 I took a strace of all network related sys calls from Python and Perl. It seems both don't do multi appends and waiting for the OK after appending one mail. But the Python version is getting a completely different response. Python: "* 204 EXISTS\r\n* 1 RECENT\r\nNBGC3 OK [APPENDUID 1343283946 204] Append completed.\r\n" Perl: "2 OK [APPENDUID 1343283946 255] Append completed.\r\n" The Python lib seems to trigger a EXISTS and RECENT lookup on every append, which could be the performance difference. I couldn't figure out why, yet! Python strace: http://aboutsimon.com/py.strace Perl strace: http://aboutsimon.com/pl.strace Strings are shortened to 40 chars. Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: append in IMAP4 from imaplib very slow
On 07/26/2012 09:49 AM, Simon Pirschel wrote: On 07/26/2012 05:21 AM, Tim Chase wrote: On 07/25/12 12:47, Simon Pirschel wrote: I'm currently experimenting with IMAP using Python 2.7.3 and IMAP4 from imaplib. I noticed the performance to be very bad. I read 5000 files from a directory and append them to an IMAP INBOX. The hole procedure of reading and appending is taking about 210 seconds. I set up the exact same code in Perl to check if there is a general IMAP server configuration issue, since CPU and I/O isn't the problem. The same amount of data on the same IMAP server is done after 7.9 seconds using Perl. The difference is huge and I tried to narrow the issue down by profiling the Python code. The profile results are, 206 seconds are spent in calling socket.recv. While I don't know the ins and outs of the Perl code, it looks like the Python imaplib.py is doing some pretty straight-forward send/receive work. However, IMAP4 does support both pipelining and multi-append extensions, so if the Perl code takes advantage of the features if the server offers them, it might be reaping significant gains over the naïve Python code. Can you get a debugging dump of the commands being sent each way? (particularly if you see a bunch of APPEND commands before the reply acknowledgement, as detailed at [1]) -tkc [1] http://www.ietf.org/rfc/rfc3502.txt on page 4 I took a strace of all network related sys calls from Python and Perl. It seems both don't do multi appends and waiting for the OK after appending one mail. But the Python version is getting a completely different response. Python: "* 204 EXISTS\r\n* 1 RECENT\r\nNBGC3 OK [APPENDUID 1343283946 204] Append completed.\r\n" Perl: "2 OK [APPENDUID 1343283946 255] Append completed.\r\n" The Python lib seems to trigger a EXISTS and RECENT lookup on every append, which could be the performance difference. I couldn't figure out why, yet! Python strace: http://aboutsimon.com/py.strace Perl strace: http://aboutsimon.com/pl.strace Strings are shortened to 40 chars. Simon Ok, forget about the EXISTS and RECENT response. The server will response this way if you selected a mailbox, which I did in the Python code but not in the Perl code. I disabled selecting the mailbox in Python and there is no difference in the runtime. So, this isn't the issue. -- http://mail.python.org/mailman/listinfo/python-list
Re: append in IMAP4 from imaplib very slow
On 07/26/2012 11:25 AM, Simon Pirschel wrote: Ok, forget about the EXISTS and RECENT response. The server will response this way if you selected a mailbox, which I did in the Python code but not in the Perl code. I disabled selecting the mailbox in Python and there is no difference in the runtime. So, this isn't the issue. I solved the issue. The bad performance is caused by the socketopt socket.TCP_NODELAY set to 0 by default. Request timing with socket.TCP_NODELAY=0: 0.0501310825348 seconds Request timing with socket.TCP_NODELAY=1: 0.0027711391449 seconds This is a huge difference. Setting TCP_NODELAY=1 will bring the runtime from 3:30 minutes down to 14 seconds! Not Perl speed, but close. Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: dbf.py 0.94.003
On 27/07/12 05:31, Ethan Furman wrote: A few more bug fixes, and I actually included the documentation this time. :) It can be found at http://python.org/pypi/dbf, and has been tested on CPythons 2.4 - 2.7, and PyPy 1.8. [snip] Ethan, That's great. Can you comment on the ultimate aim of the project? Is this package primarily a "universal dbf translator" that allows the data stored in DBFs (which I might add I have many in legacy VFP applications and GIS Shapefiles) to be accessed and extracted or is the module being designed to be used interactively to extract data from and update tables? I remember on the last thread that someone mentioned that indexes are not supported. I presume then that moving around a table with a couple of million records might be a tad slow. Have you tested the package on large datasets, both DBFs with a large number of records as well as a large number of fields? -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: [ANN] New paper published (Volume 7 of The Python Papers) - High-Speed Data Shredding using Python
On 31/07/12 07:36, mauricel...@acm.org wrote: Link: http://ojs.pythonpapers.org/index.php/tpp/article/view/243 Abstract In recent years, backup and restore is a common topic in data storage. However, there’s hardly anybody mention about safe data deletion. Common data destruction methodology requires the wipe operation to fill the disk with zeros, then with random data, and then with zeros again. Three passes are normally sufficient for ordinary home users. On the down side, such algorithms will take many hours to delete a 2TB hard disk. Although current Linux utility tools gives most users more than enough security and data protections, we had developed a cross-platform standalone application that could expunge all confidential data stored in flash drive or hard disk. The data shredding software is written in Python, and it could overwrite existing data using user-defined wipe algorithm. This software project also explores the technical approaches to digital data destruction using various methodologies defined in different standards, which includes a selection of military-grade procedures proposed by information security specialists. The application operates with no limitations to the capacity of the storage media connected to the computer system, it can rapidly and securely erase any magnetic mediums, optical disks or solid-state memories found in the computer or embedded system. Not only does the software comply with the IEEE T10/T13 specifications, it also binds to the number of connectivity limited by the SAS/SATA buses. The paper is very interesting. Funny though I found it very hard to find a name of the application developed -- I presume it is the successor of CBL Data Shredder -- or if it is foss or proprietary package? Does the application have a project page? -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Geneology Packages -- WAS: Looking for a good introduction to object oriented programming with Python
On 09/08/12 12:59, Dennis Lee Bieber wrote: On Wed, 08 Aug 2012 20:31:57 +0100, lipska the kat declaimed the following in gmane.comp.python.general: A Tree consists of Node(s) and Leaf(s), relationships are modelled by following the Line(s) in the Tree diagram and that is it. Line may be a class as in 'the patriarchal line' I'm not sure, it would come out in the iterative wash. We can infer whatever we want from this simple model. A Leaf is a child, until it becomes a parent when it becomes a Node. To anthropomorphize a bit more (I love that word) and introduce non species specific words and concepts, a Node can be a father or mother (simple to implement by If a "node" is a father or mother, and it takes one of each to produce a "leaf", your "tree" has just collapsed. In genealogy, a "tree" is merely the representation -- in one direction -- of relationships from a single Person to either all ancestors, or to all descendents. "Father", "mother", "son", "daughter" (or to simplify, "parent", "child") are merely roles taken on by a person in relationship to another person. A Person can exist even if we do not know who the parents were, nor if there are any children. But what of all the ephemeral data that goes with a sentient existance on this planet such as birth certificates, newspaper articles, christenings, death certificates, photographs etc etc, what about pegigree certificates, innoculation records and any other trivia, information and flotsam that goes with a pedigree Dog or Horse or indeed Parrot. Those documents are the /evidence/ used to prove the linkages of the Person. Granted, the most popular genealogy program tends to be the least capable -- it won't let one add a person without creating a "family" first; and most all evidence is recorded as just a text memo. In contrast, TMG, provides for "Sources" (the documents), "Citations" (references to sources, used in the events in the person's life), "Repositories" (where the source can be found). Events cover things like "Birth", "Marriage", "Death", "Graduation", etc. [one can create custom events too]. Events have a date, a location, and can have multiple citations to the source the provides evidence that the event took place and involved the person to which it is linked. In TMG, there is no "family" as such -- only the linkages from relationship events (a "birth" event does not link a child to its parents; that is done via a pair of parent-child relationships [father-relationship, mother-relationship] and TMG supports having multiples -- only the pair marked a "primary" is used to produce "tree-like" reports, but the system supports having birth-parents and adoptive-parents at the same time in the data). It even supports having multiple "Birth" events too, if one finds conflicting evidence and can not determine if some is invalid. I'm not going to go into depth, but the TMG (v8) database consists of 29 tables, and the user interface centers on displaying a list of events for a person. Oh, and the person can have more than one name too, though only one can be listed as primary (shows at the top of the page) -- the others appear as name events. The absolute minimum to define a person in TMG is an ID number (the internal primary key) and preferably a "primary" name (and the name could be all blanks -- though having multiple people with no names, just ID numbers, makes for difficulty when later adding relationships: does this person connect to "(---unknown---)(---unknown---)" #2718 or to "(---unknown---)(---unknown---)" #3145 ) Since we have graduated to a completely different topic I have renamed the thread. If people are interested in a totally python-based open source FREE (as in no $$) package that can do all the above try gramps... http://gramps-project.org/ I have used this package for a few years now and it is fantastic. Check out the features page to see what I mean. http://gramps-project.org/features/ -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: how to call perl script from html using python
On 14/08/12 15:12, mullaper...@gmail.com wrote: Hi, I wanna call perl script in HTML form n store that data in DB using Python. How can i do this...?? Please help me Thank you Pervez Google you question. Many solutions already exist on the Internet. -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: how to call perl script from html using python
On 14/08/12 15:31, mullaper...@gmail.com wrote: On Tuesday, August 14, 2012 10:42:48 AM UTC+5:30, mulla...@gmail.com wrote: Hi, I wanna call perl script in HTML form n store that data in DB using Python. How can i do this...?? Please help me Thank you Pervez Hey Simon, Thank You for your mail and time, Yest I spent entire day for this , But I didn't get any solution for this problem .I google it but am not able to get any solution for this Then you should outline what you have tried and what the problems you encountered that way people can help. -- Cheers Simon Simon Cropper - Open Content Creator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
pylagiarism -- Need help now! Please provide code...
Hi Everyone, I just had a great idea for a new python module. I haven't bothered googling it or doing any research. I need help putting together some code; today preferably, my boss is on my back. Can someone please contribute a functioning module showing me how to do it? Once I have all your submissions, I will compile a functioning package, which I hope to sell. Don't worry, no one will be at risk of being sued, I don't intend to credit you with the code and you will not know anything about what I have done because I don't intend to post and feedback to the list. Licenses are not a problem either, I don't believe in them and even if you find out I have plagiarized your stuff you have bub-kiss chance of suing me as I am in another jurisdiction. So, now you know where I am coming from, I would like to thank you for all your help. Remember though, I need help now, so please stop what you are doing and submit something quickly. I'm waiting... Still waiting... Hey, stop reading and get on with writing some code, I don't have all day! -- Simon Disclaimer :) Please don't flame me, I have written this with my tongue in my cheek and a light hearted take on some people request for assistance on a range of mail lists. It was not meant to target anyone in particular only to exaggerate how some people's requests appear to lurkers and contributors on many fora I frequent. -- http://mail.python.org/mailman/listinfo/python-list
Re: pylagiarism -- Need help now! Please provide code...
On 14/08/12 18:19, Peter Otten wrote: Simon Cropper wrote: Hi Everyone, I just had a great idea for a new python module. I haven't bothered googling it or doing any research. I need help putting together some code; today preferably, my boss is on my back. Can someone please contribute a functioning module showing me how to do it? Once I have all your submissions, I will compile a functioning package, which I hope to sell. Don't worry, no one will be at risk of being sued, I don't intend to credit you with the code and you will not know anything about what I have done because I don't intend to post and feedback to the list. Licenses are not a problem either, I don't believe in them and even if you find out I have plagiarized your stuff you have bub-kiss chance of suing me as I am in another jurisdiction. So, now you know where I am coming from, I would like to thank you for all your help. Remember though, I need help now, so please stop what you are doing and submit something quickly. I'm waiting... Still waiting... Hey, stop reading and get on with writing some code, I don't have all day! You're close, but I prefer to help out the guy with the brilliant idea (I know it's brilliant because he says so) who is offering me a fraction of the fortune he is going to make once I've done all the work... Peter, You are right. Quite remiss of me. Anyone willing to contribute money to help with the compilation of the code will get a portion of the profits. Just send me your account details, name and address; and I will ensure, once I have been paid, that I will send you your cut! :) -- Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Haskell -> Python
On 02/11/12 19:56, Dave Angel wrote: On 11/02/2012 03:19 PM, foste...@gmail.com wrote: Hi All, As part of a Nim solver I'm playing around with I'm trying to code this Haskell snippet: options [x] = zero : [ [y] | y <- [1..x - 1] ] options (x:xs) = map (++ xs) (options [x]) ++ map (x:) (options xs) in Python. So far I have this, which works OK, but somehow doesn't feel right: def options( heaps ): if heaps == []: return [] head, tail = heaps[:1], heaps[1:] # Calculate all possible moves which is the sum of # prepending all possible head "moves" to the tail # and appending all possible tail "moves" to the head return [ [h] + tail for h in range( head[0] ) ] \ + [ head + t for t in options( tail ) ] Is there anything anyone could recommend to make it more "Pythonic" or more functional. It looks clumsy next to the Haskell. Regards etc. You'd save people a lot of time if you'd specify that the parameter heaps is a list of ints, perhaps initially [1,3,5,7] or [3, 4, 5] depending on which variation of Nim you're trying to. There are many. One variant is that some versions of Nim say the winner is the player who does NOT take the last piece. I'll assume that the goal is to end up with [0,0,0,0] My main problem with studying your code is that brute force is totally unnecessary; there's a fairly simple strategy for winning at Nim. Certainly it's simple enough to have perfect strategy without any computer. A "good" move is any one where the xor of all the items in the list ends up as zero. There is always at least one move for an "ungood" position that results in a "good" one. Thus the strategy is to go from good to good, with the opponent always stuck on an ungood one. Hi Dave, Thanks for the comments. Yes, I should have specified that the input is a list of ints giving the size of each heap, and the return value should be a list of all game positions reachable from the input position. At the moment I'm not concentrating on any particular Nim flavour, just trying to enumerate all possible moves from a given position. I know that there's an easier way to determine winning-losing positions, but my question was more about programming style than Nim strategy. My code to calculate the "nim-value" looks like this: def nim_val( heaps ): return functools.reduce( operator.xor, heaps, 0 ) Assuming that we're playing "non-misere" Nim then a zero nim-value is a lose for the player *about* to play. Regards Simon -- http://mail.python.org/mailman/listinfo/python-list
Re: Numpy outlier removal
"Steven D'Aprano" wrote in message news:50ea28e7$0$30003$c3e8da3$54964...@news.astraweb.com... > On Sun, 06 Jan 2013 19:44:08 +, Joseph L. Casale wrote: > >> I have a dataset that consists of a dict with text descriptions and >> values that are integers. If required, I collect the values into a list >> and create a numpy array running it through a simple routine: >> >> data[abs(data - mean(data)) < m * std(data)] >> >> where m is the number of std deviations to include. > > I'm not sure that this approach is statistically robust. No, let me be > even more assertive: I'm sure that this approach is NOT statistically > robust, and may be scientifically dubious. > > The above assumes your data is normally distributed. How sure are you > that this is actually the case? > > For normally distributed data: > > Since both the mean and std calculations as effected by the presence of > outliers, your test for what counts as an outlier will miss outliers for > data from a normal distribution. For small N (sample size), it may be > mathematically impossible for any data point to be greater than m*SD from > the mean. For example, with N=5, no data point can be more than 1.789*SD > from the mean. So for N=5, m=1 may throw away good data, and m=2 will > fail to find any outliers no matter how outrageous they are. > > For large N, you will expect to find significant numbers of data points > more than m*SD from the mean. With N=10, and m=3, you will expect to > throw away 270 perfectly good data points simply because they are out on > the tails of the distribution. > > Worse, if the data is not in fact from a normal distribution, all bets > are off. You may be keeping obvious outliers; or more often, your test > will be throwing away perfectly good data that it misidentifies as > outliers. > > In other words: this approach for detecting outliers is nothing more than > a very rough, and very bad, heuristic, and should be avoided. > > Identifying outliers is fraught with problems even for experts. For > example, the ozone hole over the Antarctic was ignored for many years > because the software being used to analyse it misidentified the data as > outliers. > > The best general advice I have seen is: > > Never automatically remove outliers except for values that are physically > impossible (e.g. "baby's weight is 95kg", "test score of 31 out of 20"), > unless you have good, solid, physical reasons for justifying removal of > outliers. Other than that, manually remove outliers with care, or not at > all, and if you do so, always report your results twice, once with all > the data, and once with supposed outliers removed. > > You can read up more about outlier detection, and the difficulties > thereof, here: > > http://www.medcalc.org/manual/outliers.php > > https://secure.graphpad.com/guides/prism/6/statistics/index.htm > > http://www.webapps.cee.vt.edu/ewr/environmental/teach/smprimer/outlier/outlier.html > > http://stats.stackexchange.com/questions/38001/detecting-outliers-using-standard-deviations > > > > -- > Steven If you suspect that the data may not be normal you might look at exploratory data analysis, see Tukey. It's descriptive rather than analytic, treats outliers respectfully, uses median rather than mean, and is very visual. Wherever I analyzed data both gaussian and with EDA, EDA always won. Paul -- http://mail.python.org/mailman/listinfo/python-list
Re: Fetching data from a HTML file
On Fri, Mar 23, 2012 at 9:52 PM, Sangeet wrote: > Hi, > > I've got to fetch data from the snippet below and have been trying to > match the digits in this to specifically to specific groups. But I can't > seem to figure how to go about stripping the tags! :( > > Sum class="green">24511 align='center'>02561.496 > [min] > > > Actually, I'm working on ROBOT Framework, and haven't been able to figure > out how to read data from HTML tables. Reading from the source, is the best > (read rudimentary) way I could come up with. Any suggestions are welcome! > Sangeet, I think Python comes with its own HTML parser. Can you have a look at this http://docs.python.org/library/htmlparser.html and see if it helps? > > Thanks, > Sangeet > -- > http://mail.python.org/mailman/listinfo/python-list > -- Regards, YeeYaa (Simon Yan) http://simonyan.fedorapeople.org/ -- http://mail.python.org/mailman/listinfo/python-list
Re: inquery
On 19/04/12 08:32, Lovda, Kathryn wrote: Hello, I'm having trouble trying to script for a fellow graduate student who is doing research on frogs and their homeranges. He asked me to help him by using python to manipulate his data on ArcMap 10. Here is a summary of the situation: "A fellow graduate student working in the Boone Herpetology lab in the Zoology Department has asked you to help him with his research project. Specifically he needs to know what land use land cover types the frogs he has been studying had within their "homerange" in the early 1990s. He has field measurements for current data but he wants historical data on what this same area was like in terms of land use land cover (LULC). The output you provide to him should be a table that lists the total area of each land cover type within ALL frog homeranges in each county. Use the data provided to you to write a script that has the desired output that your friend needs." I know that I have to use the JoinField command and the Statistics command, but not sure how to formulate the script. Is there anyway you can send me a script to work off of? Thanks for your help. -- Kathryn Lovda Miami University IES Graduate Student Botany & Environmental Science B.A. Major lov...@muohio.edu <mailto:lov...@muohio.edu> Kathryn, This type of work is basic GIS work that should be able to be achieved without resorting to scripting. That is, achieved through a simple GUI interface using preconfigured tools. The issue is whether you actually have land use and land cover data for the 1990s. Present the same inquiry to an ESRI forum - you would probably have more chance of a response. If your University does not have the entire ESRI suite you can download any number of free and open source tools that can do this work -- e.g. GRASS, gvSIG, QGIS. All you need to do is convert the ArcMap file to something that can be used by ArcView or by one of these tools (e.g. shapefile). -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: Newby Python Programming Question
On 15/05/12 12:18, Chris Angelico wrote: On Sat, May 12, 2012 at 8:25 AM, Coyote wrote: I've been playing around with a couple of IDEs because I liked the one I used with IDL and I wanted to use something similar for Python. The IDLDE was an Eclipse variant, but I've tried installing Eclipse before for something else and I'm pretty sure I don't need *that* kind of headache on a Friday afternoon. Unless, of course, I need a good excuse to head over to the Rio for the margaritas. :-) When it comes to IDEs, I've never really gone for any. My current setup at work (which I convinced my boss to deploy to all our developers, himself included) is all open-source: SciTE (Scintilla-based Text Editor) with a few in-house configurations, a good makefile, and m4 (plus git for source control). SciTE has syntax highlighting for all the languages we use, and is set to save and 'make' on press of F7, and the makefile handles everything else. There's a couple of in-house scripts such as a cache-control script (looks through our HTML and PHP pages for references to .js files and adds ?tag to them where tag comes from git) and a rapid deployment handler, but the upshot is that I edit a file, hit F7, and everything happens for me. That's about as good as any IDE would give, but without the overhead of most IDEs. ChrisA Sorry for responding to you post Chris but I missed Davids post. David, I really like SPE IDE - Stani's Python Editor (http://pythonide.stani.be/). It and the bundled packages work really well. I note it works on Windows, Mac and Linux. -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: Where is the most recent Tkinter information
On 17/05/12 13:02, Mark R Rivet wrote: It seems like all the info on tkinter is around the 2000 time frame. Is tkinter still being developed/supported? The main page of the python 3.2.3 documentation for tkinter can be found here... http://docs.python.org/py3k/library/tkinter.html?highlight=tkinter#tkinter it is dated 2012. This seems to be duplicated from the ActiveState site here... http://docs.activestate.com/activepython/3.1/python/library/tkinter.html also dated 2012. Here are some other resources I have stumbled on... http://www.tutorialspoint.com/python/python_gui_programming.htm http://infohost.nmt.edu/tcc/help/pubs/tkinter/ http://www.tkdocs.com/tutorial/index.html http://www.ibm.com/developerworks/linux/library/l-tkprg/ -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: Looking for Python script for Vector Map simplification, preserving shape and topology
On 18/05/12 03:46, David Shi wrote: Dear All, I am looking for Python script for Vector Map simplification, preserving shape and topology. Please get in touch with davidg...@yahoo.co.uk Regards. David David, You really need to provide more information to get a specific answer; what sort of vector file? What do you mean by simplify? etc. Of course, most likely most people python-gis bent would say check out the GDAL libraries -- http://pypi.python.org/pypi/GDAL/ -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
GUI toolkits and dynamic table browser widget
Hi, There has been some discussion on this list regarding GUI toolkits and it reinvigorated my search for one to meet my needs. I would like to create windows with grids (AKA rows and column of a table like excel). Do any of the GUI interfaces have these types of widgets? i have looked but can't find any and I have not stumbled on program that presents data in this way so I can see how they do it. Specifically I would like to run a SQL command and have the returned list passed to a widget with little or no manipulation and that widget present the data, allow the user to scroll through that data and preferably allow edits to occur. These edits could then be passed back via a string to the program for inclusion in a sql-update command. Any ideas? -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: GUI toolkits and dynamic table browser widget
On 18/05/12 14:00, Vincent Vande Vyvre wrote: On 18/05/12 02:52, Simon Cropper wrote: Hi, There has been some discussion on this list regarding GUI toolkits and it reinvigorated my search for one to meet my needs. I would like to create windows with grids (AKA rows and column of a table like excel). Do any of the GUI interfaces have these types of widgets? i have looked but can't find any and I have not stumbled on program that presents data in this way so I can see how they do it. Specifically I would like to run a SQL command and have the returned list passed to a widget with little or no manipulation and that widget present the data, allow the user to scroll through that data and preferably allow edits to occur. These edits could then be passed back via a string to the program for inclusion in a sql-update command. Any ideas? Have a look at PyQt [1], specially QTableView [2] and QtSql [3] [1] http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/index.html [2] http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qtableview.html [3] http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qsql.html Vincent, That looks very promising... do you understand the licensing though? GPL to GPL is obvious but would development of an in-house system be commercial or GPL licensing? -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: serial module
Sounds like you may be using this on a Windows machine. the code is functional, it is best practice to close the port first before openiing it. If due to an error, usually not syntax, the port will stay stuck open until the program is closed and reopened. I have used the Python serial port (serial.py?) with good results. Paul Simon "Ron Eggler" wrote in message news:jp6gcj$1rij$1...@adenine.netfront.net... > Hoi, > > I'm trying to connect to a serial port and always get the error > "serial.serialutil.SerialException: Port is already open." whcih is > untrue. > I have no serial port open yet, my code looks like this: > #!/usr/bin/python > import time > import serial > > # configure the serial connections (the parameters differs on the device > # you are connecting to) > ser = serial.Serial( >port='/dev/ttyUSB0', >baudrate=19200, >parity=serial.PARITY_ODD, >stopbits=serial.STOPBITS_TWO, >bytesize=serial.SEVENBITS > ) > > ser.open() > > Why do I get this error? > > Thank you, > Ron > > --- Posted via news://freenews.netfront.net/ - Complaints to > n...@netfront.net --- -- http://mail.python.org/mailman/listinfo/python-list
Re: GUI toolkits and dynamic table browser widget
On 19/05/12 01:09, Dennis Lee Bieber wrote: On Fri, 18 May 2012 10:52:07 +1000, Simon Cropper declaimed the following in gmane.comp.python.general: Hi, There has been some discussion on this list regarding GUI toolkits and it reinvigorated my search for one to meet my needs. I would like to create windows with grids (AKA rows and column of a table like excel). Do any of the GUI interfaces have these types of widgets? i have looked but can't find any and I have not stumbled on program that presents data in this way so I can see how they do it. Page 426 of "wxPython in Action" starts a chapter on using a grid view (and a "gridtable" which uses a linked data structure for populating the grid).. Specifically I would like to run a SQL command and have the returned list passed to a widget with little or no manipulation and that widget present the data, allow the user to scroll through that data and preferably allow edits to occur. These edits could then be passed back via a string to the program for inclusion in a sql-update command. Don't know if it has a direct link to SQL data sources; however, the "gridtable" is probably closest. Dennis, Thanks for you feedback. Sometimes it just knowing the name of what you are looking for you to be able to find the data. Googling gridtable allowed me to find my way to the wxGrid Manual which seems to be what I was asking for... http://wiki.wxpython.org/wxGrid%20Manual wxPyGridTableBase, a particular class associated with wxGrid appears to be what I need. The blurb states "The wxPyGridTableBase class is the interface between the wxGrid and your application-specific data sources" http://wiki.wxpython.org/wxPyGridTableBase -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: GUI toolkits and dynamic table browser widget
On 22/05/12 05:35, Sibylle Koczian wrote: So I suppose you're using Python 2 or that's acceptable for you at least. In this case I'd take a long look at Dabo: http://www.dabodev.com/ That's based on wxPython but easier to use and explicitly made for database applications. Developers and mailing list are especially helpful and friendly. I have investigated Dabo. Dabo is OK but is like a big wizard. You fix you underlying data structure then it creates basic menus, data entry screens, etc. The basic stuff is OK but you need change the underlying code to customize the screens and you are bound to use the classes created by the developers (you can create you own but all sorts of interactions can happen apparently, and although it can be done, care needs to be taken to avoid conflicts -- the recommendation by the developers to is use the existing classes whenever possible). On top of this the project is not being developed any more. What is there, is what is there. The developers occasionally jump on the forums to propose a solution to an interesting problem but state that no further development will be happening. The community is still active however and there are a number of devotees. Personally, when I reviewed it, I wanted to develop a different dialog screen and database model than what Dabo is designed to address, which meant that I required to butcher their code and classes to achieve what I wanted. In my mind you are better starting from scratch using a maintained library/toolkit, rather than creating a hybrid system with a unmaintained project (that is unless you want to fork the project). -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
wxpython using variable with wx.statictext ignores \n
Hi, I have some wxPython code created with wxGlade that I am customizing. I have a label created under the def __init__() section of the Frame Class. It states... self.Question = wx.StaticText(self, -1, "My question...") if I insert a new line character in this string like this then the output is placed on two lines as expected. self.Question = wx.StaticText(self, -1, "My \nquestion...") Output My question I am getting the question as an argument using sys.argv[] and putting it in a variable called "question_text". The code is as follows... question_text = "My \nquestion..." self.Question = wx.StaticText(self, -1, question_text) Output My \nquestion How do I get the line text \n recognized so the break is inserted using the variable technique like what happened when I actually used a string? ...in bash you would do "$question_text". Is there comparable macro substitution in python. -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://www.fossworkflowguides.com/gis bash / Pythonhttp://www.fossworkflowguides.com/scripting -- http://mail.python.org/mailman/listinfo/python-list
Re: testing if a list contains a sublist
On Mon, Aug 15, 2011 at 4:26 PM, Johannes wrote: > hi list, > what is the best way to check if a given list (lets call it l1) is > totally contained in a second list (l2)? > > for example: > l1 = [1,2], l2 = [1,2,3,4,5] -> l1 is contained in l2 > l1 = [1,2,2,], l2 = [1,2,3,4,5] -> l1 is not contained in l2 > l1 = [1,2,3], l2 = [1,3,5,7] -> l1 is not contained in l2 > > my problem is the second example, which makes it impossible to work with > sets insteads of lists. But something like set.issubset for lists would > be nice. > > greatz Johannes > -- > http://mail.python.org/mailman/listinfo/python-list > Probably not the most efficient way, but I wanted to mention it: from difflib import SequenceMatcher def list_in(a, b): '''Is a completely contained in b?''' matcher = SequenceMatcher(a=a, b=b) m = matcher.find_longest_match(0, len(a), 0, len(b)) return m.size == len(a) Cheers, ~Simon -- http://mail.python.org/mailman/listinfo/python-list
Hello, and request for help with 'dynamic grids'
Hi, I am a applications developer - originally from Windows using primarily Visual Foxpro, although I am familiar with a variety of other xbase derivatives. I now use Linux / Ubuntu, and have been actively teaching myself Python with the view to migrate most of my applications to sqlite-based database. I am looking for the ability to create dynamic grids in a window but can't for the life of me find how to do this. Here is the functionality that I desire... 1. Have a dialog appear that allows me to select a database, e.g. sqlite3 database. 2. Select table in the database and have all the records appear in a grid. Fields represented as column, width and order adjustable, rows representing records. Each cell can be edited directly. 3. I would like to create filters on this grid based on attributes in the table. So if the table is a list of names, filter and show only those people with a particular first name. For people familiar with xbase languages it equivalent to browsing a table and applying a filter. 4. Once the record is identified I would like to select the record or hit enter to have the data sent to the keyboard buffer or put into the clipboard. I have found most of these elements available. I can create dialogs, I can connect to a database, I can extract data from the tables using SQL but I can't find how to easily get these lists into a grid -- it appears to me you need to allocate list record 1 to grid row 1, list record 2 to grid row 2, etc and manage how many rows are displayed and 'page' through the table. Am I missing something? I presume that you could just supply a list or array selected using SQL from a table and just pass this data to a grid and have it manage all the basics like if the window is resized the number of rows and columns are adjusted accordingly, buffering records, etc. My investigations have generally found that windows/forms/data entry screen can be created for a specific table or view, but these are hard-wired during development. Is there anyway of rapidly defining the grid during runtime so any table can be viewed? -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://gis.fossworkflowguides.com bash / Pythonhttp://scripting.fossworkflowguides.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello, and request for help with 'dynamic grids'
On 05/09/11 17:19, Steven D'Aprano wrote: On Mon, 5 Sep 2011 03:18 pm Simon Cropper wrote: I am looking for the ability to create dynamic grids in a window but can't for the life of me find how to do this. What GUI toolkit are you using? I have looked at wxGlade, Boa Constructor, wxFormBuilder, tkinder, I have also looked through the Python website many times looking for commands that would allow me to create a GUI from scratch. -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://gis.fossworkflowguides.com bash / Pythonhttp://scripting.fossworkflowguides.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello, and request for help with 'dynamic grids'
On 05/09/11 20:40, Thomas Jollans wrote: It depends on which windowing toolkit you're planning to use. If you use PyGTK, you'd want a TreeView widget to display the list. Fill a ListStore instance with your data and give that to the TreeView. You can implement filtering and sorting on top of that using TreeModelFilter and TreeModelSort. I have look at most. I have no preference. Are you able to point me to some resource material explaining how this can be done - e.g. a tutorial or manual? LibreOffice and OpenOffice have database management components (I haven't used them, I assume they're somewhat similar to MS Access) - and they can be scripted using Python. Depending on what you're doing, and what you're planning to do in the future (re learning investment), that might be worth looking into. 'Base' is of no value in this regard. It is not really designed for this and there is a raging debate at the moment whether it will be maintained in the future. It also fails in that it requires predefined connections and forms to be established. It would not be possible to dynamically link to a table in a database (I have established ODBC links to a SQLite database, but the driver is an un-maintained draft). I also believe that the 'base' component in libreoffice/openoffice is a java implementation not python. -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://gis.fossworkflowguides.com bash / Pythonhttp://scripting.fossworkflowguides.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello, and request for help with 'dynamic grids'
On 05/09/11 23:23, pyt...@bdurham.com wrote: Check out dabodev.com. Dabo is a Python framework created by former VFP developers. Dabo is a great product. Spoke extensively with Ed Leafe and Paul McNett. Unfortunately the framework is not 'dynamic'. If you have an fixed database and tables it can quite quickly create a basic data entry setup and menu. Looks great when it runs. The problem is creating the window and grid on the fly. I want a program that can be used to open any database and 'data mine' and extract table content. Dabo allows RAD for an established relational databases not unknown ones. -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://gis.fossworkflowguides.com bash / Pythonhttp://scripting.fossworkflowguides.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Hello, and request for help with 'dynamic grids'
On 06/09/11 00:40, alex23 wrote: On Sep 5, 3:18 pm, Simon Cropper wrote: My investigations have generally found that windows/forms/data entry screen can be created for a specific table or view, but these are hard-wired during development. Is there anyway of rapidly defining the grid during runtime so any table can be viewed? The commercial product Resolver One provides a grid/spreadsheet style interface with Python scripting capabilities. I'm not sure of its current licensing status but I believe it used to be free if used on open source projects. http://www.resolversystems.com/products/resolver-one/ Each spreadsheet itself is Python code; I think it should be quite do- able to take something with introspective SQL capabilities like SQLAlchemy and have it title columns and fill them with the correct fields accordingly. Hope this helps. Alex, The Resolver Package looks good. Not exactly open source though. I equate it to a proprietary package that can at times be used for free by select groups. The product creates spreadsheets with python code in the background (instead of say VBA in Excel or Basic in Calc). Access to a database still needs to be hard-wired, so it does not act as a 'dynamic' viewer. The product works pretty much like Excel and Calc in this manner. Sheets can be shared, although the Resolver Exchange website does not clarify the licence under which samples are released (GPL, CC, etc), so it is debatable how any of this could reliably be used in creation of derivatives. From what I can glean from this page... http://www.resolversystems.com/opensource/ ... Resolver will allow you to use the package if you are an open source project to create spreadsheets that can be redistributed. For people to use these sheets they need to download the viewer or purchase the package. -- Cheers Simon Simon Cropper - Open Content Creator / Website Administrator Free and Open Source Software Workflow Guides Introduction http://www.fossworkflowguides.com GIS Packages http://gis.fossworkflowguides.com bash / Pythonhttp://scripting.fossworkflowguides.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Parsing numeric ranges
On 25 February 2011 09:27, Seldon wrote:
> Hi all,
> I have to convert integer ranges expressed in a popular "compact" notation
> (e.g. 2, 5-7, 20-22, 41) to a the actual set of numbers (i.e.
> 2,5,7,20,21,22,41).
>
> Is there any library for doing such kind of things or I have to write it
> from scratch ?
I dredged this out:
def _revision_list_with_ranges_to_list_without_ranges(revision_list):
'''Convert a revision list with ranges (e.g. '1,3,5-7') to a
simple list without ranges (1,3,5,6,7)'''
for revision in revision_list:
if '-' in revision:
from_revision, _, to_revision = revision.partition('-')
for revision_in_range in range(int(from_revision),
int(to_revision)+1):
yield revision_in_range
else:
yield int(revision)
--
Cheers,
Simon B.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python benefits over Cobra
> On 05-Apr-11 06:22 AM, Brendan Simon (eTRIX) wrote: >> >> Any other arguments where Python has benefits over Cobra ?? >> >> Cheers, Brendan. >> > Two questions: > 1. Is Cobra Open Source? > 2. The blog ended on October, did he run out of steam? > > I liked the '.', in place of '.self', but that's been rejected for Python. "Cobra is an open source project under the MIT license." according to the web site. It seems that it mostly, if not all, the work of one person. All code commits seem to be from Charles Esterbrook. It seems the latest release is Oct 2010, but I can see posts in the forum for April 2011, March, Feb, . I too like the '.' in place of self :) However, I don't like _ as line continuation :( Life is tough, eh ?? It also looks like there is work to have it run in a JVM. I presume that means that no .NET/Mono framework is required ?? -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.10 Fizzbuzz
On Tue, Feb 28, 2023 at 04:05:19PM -0500, avi.e.gr...@gmail.com wrote: Is it rude to name something "black" to make it hard for some of us to remind them of the rules or claim that our personal style is so often the opposite that it should be called "white" or at least shade of gray? The usual kidding aside, I have no idea what it was called black but in all seriousness this is not a black and white issue. Opinions may differ when a language provides many valid options on how to write code. If someone wants to standardize and impose some decisions, fine. But other may choose their own variant and take their chances. https://pypi.org/project/grey/ https://pypi.org/project/white/ https://pypi.org/project/blue/ https://pypi.org/project/oitnb/ :o It amuses me that opinionated formatter, with very little configurability by design, in the face of differing opinions just results in forks or wrappers that modify the behaviours that might otherwise have been configuration options. Simon -- https://mail.python.org/mailman/listinfo/python-list
Re: Baffled by readline module
On Fri, Mar 10, 2023 at 06:37:56AM -0800, Grant Edwards wrote: On 2023-03-10, Weatherby,Gerard wrote: I'll have to remember that one. It doesn't really fit my current use case, but there are others where it would work nicely. However, cmd.Cmd does not provide command recall and editing. According to the page above, that's provided by the readline module There is also prompt_toolkit[1] for even more fancy command‐line handling. The documentation even states it “can be a very advanced pure Python replacement for GNU readline, but it can also be used for building full screen applications.” (It doesn’t depend on readline or libedit.) It’s used by IPython for its history, editing, and completion features. If cmd with readline is overkill for your use case then this is even more so, but I thought it worth a mention. Simon -- https://mail.python.org/mailman/listinfo/python-list
Re: Distributing program for Linux
On Tue, Mar 14, 2023 at 04:43:14PM +0100, Loris Bennett wrote: If I write a system program which has Python >= 3.y as a dependency, what are the options for someone whose Linux distribution provides Python 3.x, where x < y? The docs suggest creating your own package or building and installing from source: https://docs.python.org/3/using/unix.html To install from source, use ‘make altinstall’ (instead of ‘make install’) to avoid shadowing your system Python version. The alternative interpreter should be qualified with . version, e.g. python3.11 Depending on the package manager used by the distribution, ‘checkinstall’ could be used to build from source and install as a package without rolling your own. https://wiki.debian.org/CheckInstall On Ubuntu check out the deadsnakes PPA: https://launchpad.net/~deadsnakes/+archive/ubuntu/ppa Or use python-build from pyenv to install to a custom location: https://github.com/pyenv/pyenv/wiki/Common-build-problems#installing-a-system-wide-python Simon -- https://mail.python.org/mailman/listinfo/python-list
Re: Implementing a plug-in mechanism
On Thu, Mar 16, 2023 at 07:45:18AM +1300, dn via Python-list wrote: There is a PyPi library called pluggy (not used it). I've used informal approaches using an ABC as a framework/reminder (see @George's response). typing.Protocol is also useful here as the plugin interface can be defined separately not requiring inheriting from an ABC. Simon -- A complex system that works is invariably found to have evolved from a simple system that works.—John Gall -- https://mail.python.org/mailman/listinfo/python-list
Re: Friday finking: IDE 'macro expansions'
On Fri, Mar 17, 2023 at 11:55:38AM +1300, dn via Python-list wrote: Do you make use of your IDE's expansionist tendencies, and if-so, which ones? Unix (well, GNU/Linux) is my IDE ;) Simon -- https://mail.python.org/mailman/listinfo/python-list
Re: Friday finking: IDE 'macro expansions'
On Fri, Mar 17, 2023 at 02:05:50PM +0100, Roel Schroeven wrote: Even better than simply highlighting is (IMO) a thing called "Rainbow Braces" or "Bracket Pair Colorization" I recently learned about: both braces of a matching pair get the same color, while other pairs get other colors. I have to say I like it quite a lot. It's in VS Code these days; possible there are implementations or extensions for other editors and IDEs as well. VS Code also supports ‘semantic highlighting’: Instead of simply highlighting syntax, highlight the same identifiers in the same colours, with the aim of helping you see them through the flow of the code. Simon -- A complex system that works is invariably found to have evolved from a simple system that works.—John Gall -- https://mail.python.org/mailman/listinfo/python-list
ipaddress (was: Re: for a 'good python')
On Thu, Apr 13, 2023 at 04:00:59PM +0100, Barry wrote: Ipaddress was developed outside of the std lib and later added i recall. I used it prior to it being in the standard library: https://pypi.org/project/ipaddr/ Simon -- A complex system that works is invariably found to have evolved from a simple system that works.—John Gall -- https://mail.python.org/mailman/listinfo/python-list
need help with a ctypes project for PyPI
Hi, I have created a ctypes project as in the following link's first answer: https://stackoverflow.com/questions/42585210/extending-setuptools-extension-to-use-cmake-in-setup-py Since my machine's gcc is too high version or something, I used the docker image located here: https://quay.io/repository/pypa/manylinux2014_x86_64 to compile the copied .whl file. I ran auditwheel repair on my whl file then copied it back to my local machine without complaints. I'm not sure I understand the subsequent process I need to do with PyPI. If I copy the manylinux2014 wheel back to my local machine (into the dist folder) and run the command: python3 -m twine upload --repository testpypi dist/* following the instructions from: https://packaging.python.org/tutorials/packaging-projects/ when I pip3 install spamplusplus (this is the name I gave my test project) https://test.pypi.org/project/spamplusplus/ I get that the CMakeLists.txt file is not existent. I used the same setup.py file given in the link: https://stackoverflow.com/questions/42585210/extending-setuptools-extension-to-use-cmake-in-setup-py However I get the error that CMakeLists.txt file is not being uploaded? cmake /tmp/pip-build-6ff9ifuu/spamplusplus -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/tmp/pip-build-6ff9ifuu/spamplusplus/build/lib.linux-x86_64-3.6/spamplusplus -DCMAKE_BUILD_TYPE=Release CMake Error: The source directory "/tmp/pip-build-6ff9ifuu/spamplusplus" does not appear to contain CMakeLists.txt. I think this is something basic involving paths but could be more involved. Can anyone help!! Thanks, Simon Zhang -- https://mail.python.org/mailman/listinfo/python-list
Re: Python installer hangs in Windows 7
On Monday, December 4, 2017 at 12:44:48 PM UTC-8, christian...@gmail.com wrote: > Same with me, except that I tried to install Python 3.6.3. Unchecking > "Install launcher for all users" helped, however. This worked for me, thanks! -- https://mail.python.org/mailman/listinfo/python-list
Pyscripter Issues
Hi I have been having issues trying to run python 3.5.1 and pyscripter 2.6. Giving the error message that it cannot initialize python. I have tried to re-install multiple versions of both python and pyscripter to no avail. Any advice? Thanks Simon Sent from Mail for Windows 10 -- https://mail.python.org/mailman/listinfo/python-list
Rate limiting a web crawler
Hi, I want to build a simple web crawler. I know how I am going to do it but I have one problem. Obviously I don't want to negatively impact any of the websites that I am crawling so I want to implement some form of rate limiting of HTTP requests to specific domain names. What I'd like is some form of timer which calls a piece of code say every 5 seconds or something and that code is what goes off and crawls the website. I'm just not sure on the best way to call code based on a timer. Could anyone offer some advice on the best way to do this? It will be running on Linux and using the python-daemon library to run it as a service and will be using at least Python 3.6. Thanks for any help. -- https://mail.python.org/mailman/listinfo/python-list
Re: Rate limiting a web crawler
On 26/12/2018 18:30, Richard Damon wrote: On 12/26/18 10:35 AM, Simon Connah wrote: Hi, I want to build a simple web crawler. I know how I am going to do it but I have one problem. Obviously I don't want to negatively impact any of the websites that I am crawling so I want to implement some form of rate limiting of HTTP requests to specific domain names. What I'd like is some form of timer which calls a piece of code say every 5 seconds or something and that code is what goes off and crawls the website. I'm just not sure on the best way to call code based on a timer. Could anyone offer some advice on the best way to do this? It will be running on Linux and using the python-daemon library to run it as a service and will be using at least Python 3.6. Thanks for any help. One big piece of information that would help in replies would be an indication of scale. Is you application crawling just a few sites, so that you need to pause between accesses to keep the hit rate down, or are you calling a number of sites, so that if you are going to delay crawling a page from one site, you can go off and crawl another in the mean time? Sorry. I should have stated that. This is for a minimum viable product so crawling say two or three domain names would be enough to start with but I'd want to grow in the future. I'm building this on AWS and my idea was to have each web crawler instance query a database (DynamoDB) and get say 10 URLs and if they hadn't be crawled in the previous say 12 to 24 hours then recrawl them. If they have been crawled in the last 12 to 24 hours then skip that URL. Once a URL has been crawled I would then save the crawl date and time in the database. Doing it that way I could skip the whole timing thing on the daemon end and just use database queries to control whether a URL is crawled or not. Of course that would mean that one web crawler would have to "lock" a domain name so that multiple instances do not query the same domain name in parallel which would be bad. -- https://mail.python.org/mailman/listinfo/python-list
Re: Rate limiting a web crawler
On 26/12/2018 19:04, Terry Reedy wrote: On 12/26/2018 10:35 AM, Simon Connah wrote: Hi, I want to build a simple web crawler. I know how I am going to do it but I have one problem. Obviously I don't want to negatively impact any of the websites that I am crawling so I want to implement some form of rate limiting of HTTP requests to specific domain names. What I'd like is some form of timer which calls a piece of code say every 5 seconds or something and that code is what goes off and crawls the website. I'm just not sure on the best way to call code based on a timer. Could anyone offer some advice on the best way to do this? It will be running on Linux and using the python-daemon library to run it as a service and will be using at least Python 3.6. You can use asyncio to make repeated non-blocking requests to a web site at timed intervals and to work with multiple websites at once. You can do the same with tkinter except that requests would block until a response unless you implemented your own polling. Thank you. I'll look into asynio. -- https://mail.python.org/mailman/listinfo/python-list
asyncio Question
Hi, Hopefully this isn't a stupid question. For the record I am using Python 3.7 on Ubuntu Linux. I've decided to use asyncio to write a TCP network server using Streams and asyncio.start_server(). I can handle that part of it without many problems as the documentation is pretty good. I have one problem though that I am not sure how to solve. Each request to the server will be a JSON string and one of the components of the JSON string will be the latitude and longitude. What I want to do is associate a latitude and longitude with the client connection. Every time the latitude and longitude changes then the two values will be updated. There will only ever be one latitude and longitude for each client connection (since a device can only ever be in one place). I'm just not sure what the best method to achieve this would be when using asyncio.start_server(). Any help would be greatly appreciated. -- https://mail.python.org/mailman/listinfo/python-list
Python WebApp where Python runs on the client's machine using Pyodide
It's still a massive work in progress, but I though people here might be interested in the progress made thus far: https://app.pymedphys.com/ It is a file processing application. It has input files and output files. Users select input files from their computer, select a script to run (or edit a script to create their own) and then it produces the output files which can be downloaded. At the moment when Python is running the user interface freezes but to fix that I am told I just need to get my head around web workers ( https://github.com/iodide-project/pyodide/issues/435#issuecomment-493928297 ). It's been quite fun! Also, adding new scripts to the web app should be as simple as following the steps laid out over here: https://github.com/pymedphys/pymedphys/issues/312 I'm keen for feedback, please let me know what you think! I'll likely post this again in the near future once I fix up the freezing and I have also provided a few more example scripts. Cheers, Simon -- https://mail.python.org/mailman/listinfo/python-list
Would you be interested in this Python open source project?
I'm posting this message as a way to gauge interest in the project and to see if it is worth moving forward with. There are probably hundreds of CI/CD tools out there and many more general devops tools but what I want to build is a CI/CD tool that ONLY supports Python 3.6 or greater and only runs on one Linux distribution (my preference is Ubuntu). This way configuration would be much more simple than the vast majority of devops tools which try to support every programming language that is popular (or so it seems) on many different Linux distributions and even Windows and macOS. My theory is that if you limit the devops tool to a very limited subsection of the available options the system will be easier to configure for users, more stable, easier to patch bugs in and generally just be a better all around things for Python developers. I'd love to hear some feedback on the idea. -- https://mail.python.org/mailman/listinfo/python-list
Re: Would you be interested in this Python open source project?
On 08/10/2019 13:17, Rhodri James wrote: On 08/10/2019 11:22, Simon Connah wrote: I'm posting this message as a way to gauge interest in the project and to see if it is worth moving forward with. There are probably hundreds of CI/CD tools out there and many more general devops tools but what I want to build is a CI/CD tool that ONLY supports Python 3.6 or greater and only runs on one Linux distribution (my preference is Ubuntu). This way configuration would be much more simple than the vast majority of devops tools which try to support every programming language that is popular (or so it seems) on many different Linux distributions and even Windows and macOS. My theory is that if you limit the devops tool to a very limited subsection of the available options the system will be easier to configure for users, more stable, easier to patch bugs in and generally just be a better all around things for Python developers. I'd love to hear some feedback on the idea. I think your reasoning is sound. I probably wouldn't make a lot of use of it, but I live in Embedded Systems land where it's notoriously hard to do CI off the target silicon. Other people living in more tractable problem spaces will probably be more enthusiastic. Thank you for your reply. I'll keep working on this project and see how it turns out. I'm quite excited about it actually as I find that most CI/CD systems are so complicated when it comes to simple tasks. I want to build something where the developer spends 10 minutes reading the documentation and then can do 90% of what he needs with no more hand holding or Googling. -- https://mail.python.org/mailman/listinfo/python-list
Re: Would you be interested in this Python open source project?
On 08/10/2019 15:05, Bill Deegan wrote: You might just consider working with the BuildBot project to add support for lighter weight build workers. Re-Re-Re-inventing the wheel is almost always wasted effort. Buildbot looks good. I'll check to make sure its open source license is compatible with the Affero General Public License version 3. On the other hand I do have a desire to build something similar myself just to get the hang of things like this. Thank you for your reply. On Tue, Oct 8, 2019 at 8:33 AM Rhodri James wrote: On 08/10/2019 11:22, Simon Connah wrote: I'm posting this message as a way to gauge interest in the project and to see if it is worth moving forward with. There are probably hundreds of CI/CD tools out there and many more general devops tools but what I want to build is a CI/CD tool that ONLY supports Python 3.6 or greater and only runs on one Linux distribution (my preference is Ubuntu). This way configuration would be much more simple than the vast majority of devops tools which try to support every programming language that is popular (or so it seems) on many different Linux distributions and even Windows and macOS. My theory is that if you limit the devops tool to a very limited subsection of the available options the system will be easier to configure for users, more stable, easier to patch bugs in and generally just be a better all around things for Python developers. I'd love to hear some feedback on the idea. I think your reasoning is sound. I probably wouldn't make a lot of use of it, but I live in Embedded Systems land where it's notoriously hard to do CI off the target silicon. Other people living in more tractable problem spaces will probably be more enthusiastic. -- Rhodri James *-* Kynesim Ltd -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Accessing class variable at class creation time
It might be that I'm complicating something easy here, but I immediately thought of import sys class A: X = 2 def F(): f = sys._getframe().f_back print f.f_locals["X"] F() -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/28/05, could ildg <[EMAIL PROTECTED]> wrote: > Python is wonderful except that it has no real private and protected > properties and methods. > Every py object has dict so that you can easily find what fields and methods > an obj has, > this is very convenient, but because of this, py is very hard to support > real private and > protected? My convention, attributes with names prefixed with a single underscore are private. There's nothing to stop anyone using these, but, well, if you take the back off the radio, the warranty is void. > If private and protected is supported, python will be perfect. If *real* private and protected are *enforced*, Python will be the poorer for it. See <http://groups.google.com/group/comp.lang.python/msg/b977ed1312e10b21>. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/28/05, Simon Brunning <[EMAIL PROTECTED]> wrote: > My convention, attributes with names prefixed with a single underscore > are private. There's nothing to stop anyone using these, but, well, if > you take the back off the radio, the warranty is void. *By* convention, not *my* convention! -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/28/05, Tony Meyer <[EMAIL PROTECTED]> wrote:
> I'm not sure why I haven't seen this mentioned yet, but a leading
> double-underscore does really make a member private:
I thought about it, but I didn't mention it in the end because this
feature ("name mangling") isn't intended as a mechanism for making
things private - it's intended to prevent namespace clashes when doing
multiple inheritance. It can be used to make things private, true, but
that's abusing the feature, just as using __slots__ as a way of
"declaring variables" is an abuse - (__slots__ is a memory
optimisation feature).
--
Cheers,
Simon B,
[EMAIL PROTECTED],
http://www.brunningonline.net/simon/blog/
--
http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 28 Sep 2005 05:06:50 -0700, Paul Rubin <"http://phr.cx"@nospam.invalid> wrote: > Steven D'Aprano <[EMAIL PROTECTED]> writes: > > Do you know any language that has real private and protected attributes? > > Java? Oh, there are ways around private and protected, even in Java. CGLIB spings to mind. But you'd be wise to follow the rules, especially if you work in a team. When writing Java, I write Java. When writing Python, I write Python. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/28/05, Steven D'Aprano <[EMAIL PROTECTED]> wrote: > > If *real* private and protected are *enforced*, Python will be the > > poorer for it. See > > <http://groups.google.com/group/comp.lang.python/msg/b977ed1312e10b21>. > > That's a wonderful, if long, essay. That's the Martellibot for you. Never use a word where a paragraph with explanatory footnotes will do. Sigh. I miss him on c.l.py. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 28 Sep 2005 05:35:25 -0700, Paul Rubin <"http://phr.cx"@nospam.invalid> wrote: > I don't see anything on the CGLIB web page (in about 1 minute of > looking) that says it can get around private and protected. It looks > like something that disassembles class files and reassembles them into > new classes from them with additional interfaces. That's a lot > different than being able to reach into an already-existing class > instance and get at its private variables. I've never directly used CGLIB myself, but I do use JMock and Hibernate, and AFAIK both use CGLIB to modify private and protected members. I could certainly be wrong, though. Anyway, this is getting a bit OT... -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/28/05, Tony Meyer <[EMAIL PROTECTED]> wrote: > That's not what the documentation says: So, either the docs are wrong, or I am. You be the judge. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/29/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > What if the access to that variable was forbidden for reasons you never > foresaw? What if the class author decide to remove the variable in the next > version of the class, because it's not an interface, but only a part of the > class implementation? Then your code breaks. You can't say you weren't warned. But if too much is made private, chances are you could never get your code working in the first place. This has happened to me several times when using 3rd party Java components. Serves us right for using closed source libraries, I suppose, but that wasn't my decision. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: A rather unpythonic way of doing things
On 9/29/05, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
> "fraca7" wrote:
>
> > print ''.join(map(lambda x: chrord(x) - ord('a')) + 13) % 26) +
> > ord('a')), 'yvfc'))
>
> that's spelled
>
> print "yvfc".decode("rot-13")
>
> or, if you prefer,
>
> print "yvfc".encode("rot-13")
>
> , in contemporary python.
I'm not sure that being more comprehensible is considered a virtue in
this thread, /F. ;-)
--
Cheers,
Simon B,
[EMAIL PROTECTED],
http://www.brunningonline.net/simon/blog/
--
http://mail.python.org/mailman/listinfo/python-list
Re: Will python never intend to support private, protected and public?
On 9/29/05, could ildg <[EMAIL PROTECTED]> wrote: > **Encapsulation** is one of the 3 basic characteristics of OOP. Pyhton has encapsulation. On objetcts members are encapsulated in a namespace all of its own. You can't change these by accident. > Every programmer is just a human being, but not God. Our life is limited, > our time is limited, so we need to use convenient tools to save time. > Private variables guarantee that we will never make stupid mistakes Private variables prevent the developer of the *client* of a class from making a small subset of all possible stupid mistakes. But if the developer of the classitself is mistaken in marking a variable as private, and if the language enforces this, then there is nothing at all that the client can do to fix it. Why should the developer of the class be more likely to be god-like than the user of the class? This has happened to me more than once. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python <=> Excel question
On 9/30/05, Gerry Blais <[EMAIL PROTECTED]> wrote: > Finally, how can I, in Python, make a .txt version of a Word document? http://www.brunningonline.net/simon/blog/archives/001299.html -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: bug or feature?
Python.org General FAQ 1.4.21: Why are default values shared between objects? (http://www.python.org/doc/faq/general.html#why-are-default-values-shared-between-objects) -- http://mail.python.org/mailman/listinfo/python-list
Re: updating local()
On 6 Oct 2005 05:55:14 -0700, Flavio <[EMAIL PROTECTED]> wrote: > Now what would you do if you wanted to pass a lot of variables (like a > thousand) to a function and did not wanted the declare them in the > function header? I'd think twice. If on reflection I decided I really wanted to do it, I'd pass them all in a dictionary. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: updating local()
On 6 Oct 2005 07:04:08 -0700, Flavio <[EMAIL PROTECTED]> wrote: > I know I could pass these variables around as: > > def some_function(**variables): > ... > > some_function(**variables) > > but its a pain in the neck to have to refer to them as > variables['whatever']... > > dont you think? Err, no, not really. ;-) If you'd prfefer to access them like this: variables.whatever Check out the Bunch class here - <http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52308>. -- Cheers, Simon B, [EMAIL PROTECTED], http://www.brunningonline.net/simon/blog/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Python interpreter bug
Why would it be a bug? You've made it so that every instance of OBJ is equal to every other instance of OBJ. The behaviour is as expected. -- http://mail.python.org/mailman/listinfo/python-list
