Re: passing tuple with pyqt4 signal/slot mechanism

[Phil Thompson]

On Friday 27 April 2007 1:20 am, Pradnyesh Sawant wrote:
> > In the first version it didn't. In the second version it did.
>
> in my case, it didn't in the second version either???
>
> > The version of PyQt? The version of SIP? The version of Qt?
>
> python2.4:  2.4.4~c1-0ubuntu1
> pyqt4:  4.0.1-1ubuntu1
> python-sip4:   4.4.5-2ubuntu1
> qt4:  couldn't see just "qt4" in aptitude ???
> (have qt4-qtconfig installed though).
> qt4-dev-tools not installed (is that needed?)

Then upgrade to a current version of PyQt.

Phil
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Re: pyqt4 signal/slot using PyObject* and shortcut

[Phil Thompson]

On Friday 27 April 2007 7:05 am, Pradnyesh Sawant wrote:
> On 4/27/07, Pradnyesh Sawant wrote:
> > Hello, i have the following code:
> > #
> > import time
> > import sys
> > from PyQt4 import QtGui, QtCore
> >
> > class Counter(QtCore.QThread):
> > def __init__(self):
> > QtCore.QThread.__init__(self)
> > def run(self):
> > cntr = 0
> > while cntr < 10:
> > cntr += 1
> > self.emit(QtCore.SIGNAL("showCntr1(PyObject*)"), (cntr,
> > "a"))   # line 1
> > self.emit(QtCore.SIGNAL("showCntr2"), (cntr, "a"))
> >   # line 2
> > time.sleep(0.2)
> > class Gui(QtGui.QDialog):
> > def __init__(self, parent = None):
> > QtGui.QDialog.__init__(self, parent)
> > frameStyle = QtGui.QFrame.Sunken | QtGui.QFrame.Panel
> >
> > self.lCntr = QtGui.QLabel()
> > self.lCntr.setFrameStyle(frameStyle)
> > loGrd = QtGui.QGridLayout()
> > loGrd.addWidget(self.lCntr, 0, 0)
> > self.setLayout(loGrd)
> > self.setWindowTitle(self.tr("Counter"))
> > def showCntr1(self, val):
> > print val, str(val)
> > self.lCntr.setText(str(val))
> > def showCntr2(self, val):
> > print val, str(val)
> > self.lCntr.setText(str(val))
> > if __name__ == "__main__":
> > app = QtGui.QApplication(sys.argv)
> > dialog = Gui()
> > cntr = Counter()
> > cntr.start()
> > QtCore.QObject.connect(cntr, QtCore.SIGNAL("showCntr1(PyObject*)"),
> > dialog.showCntr1, QtCore.Qt.QueuedConnection)
> > QtCore.QObject.connect(cntr, QtCore.SIGNAL("showCntr2"),
> > dialog.showCntr1, QtCore.Qt.QueuedConnection)
>
> There's a small bug in the above line, it should be dialog.showCntr2,
> and not dialog.showCntr1. However, even with this change, the output
> shown below remains the same :(
>
> > sys.exit(dialog.exec_())
> > #
> > If i comment out "line 1", then i get the following output:
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > 0.2 0.2
> > Notice that 0.2 is the time value of the sleep instruction. Why is
> > this happening?
> >
> > On the other hand, if i comment out "line 2", then i get the following
> > output: (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > (, 'a') (, )
> > What i get from the above is that a reference to "cntr" is being
> > passed, but by the time the gui thread is actually run, both the
> > values (cntr and "a") have been destroyed, hence the NULL values.
> > ***How do i circumvent this problem?***
> >
> > Lastly, if i don't comment out any of line 1 or 2, then i get the foll
> > output: (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui object at
> > 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui
> > object at 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>,
> > (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui object at
> > 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui
> > object at 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>,
> > (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui object at
> > 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui
> > object at 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>,
> > (<__main__.Gui object at 0xb6a8f12c>, (<__main__.Gui object at
> > 0xb6a8f12c>, (<__main__.Gui object at 0xb6a8f12c>, ..
> > i don't know what this means??? Can anyone kindly explain what's
> > happening...
> >
> > I'm using:
> > python: 2.4.4~c1-0ubuntu1
> > qt4-dev-tools: not installed
> > python-qt4: 4.0.1-1ubuntu1
> > sip4: (4.4.5-2ubuntu1
> > os: ubuntu edgy

As I said in the other thread, upgrade to a current release of PyQt. 
Also "PyObject*" should no longer be used in signal signatures - 
use "PyQt_PyObject" instead.

Phil
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RE:: Re-ocurring Events

[Robert Rawlins - Think Blue]

Thank you guys for your suggestions.

I've been having a look at that launchd stuff from apple but couldn’t really
see how that applies to my requirements.

I've been putting some serious thought into how this should work as its
essentially the final part of the puzzle for my application, I'll have a
fully working model for my application.

I've been thinking about the possibility of using a combination of xpath to
search the XML with some loops which change the date. As events won't ever
be set to start before 01-01-2007 I can set that as the ceiling for my loop.
So when I'm searching for weekly events, I 'simply' take today's date and
time and loop from now until 01-01-2007 decrementing the date by a week each
iteration of the loop and then search the XML for events in that date, make
sense?

I know that's a fairly intensive way of doing it, but if it works it works.

Now, the loop is where I'm really struggling, I've not done any looping with
dates, can anyone give me a hand with this? How can I loop back in time from
now to beginning of 07 a week at a time? Do we have some form of dateAdd() I
can use with a while loop? Perhaps.

Date = (now)
While date > 2007-01-01:
Date = dateAdd(date, -1, w)

Something to that effect? Then I can quickly xpath for every iteration of
the loop.

Thanks guys for any help.

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Laurent Pointal
Sent: 26 April 2007 15:33
To: python-list@python.org
Subject: Re: Re-ocurring Events

Daniel Nogradi a écrit :
>> A bit more of a complex one this time, and I thought I'd get your 
>> opinions
>> on the best way to achieve this. Basically I'm looking for a way to 
>> describe
>> a re-occurring event, like a calendar event or appointment I guess. I'm
>> likely to use an XML file for the definition of the events, but 
>> imagine I've
>> got an event that looks something like this.
>>
>> > repeat="daily"
>> />

May take a look at launchd (Apple) XML dialect, it may have at least the 
semantic for your need.

For other parts... elementtree, yes.

>> Now what I want to do is be able to build a class which has a function 
>> like
>> 'getCurrentEvent()' which will return any events that should be 
>> occurring at
>> that time. So if the current system time and date is 2007-01-03 13:00:00
>> then it will return THAT event to me, but if it was say 2007-01-03 
>> 16:00:00
>> then it would not, as the event isn't 'due' to occur at that time. Make
>> sense?
>>
>> What's the best way of handling this? I'm really a little lost as to 
>> how I
>> might get started, checking a static date time isn't a problem, it's 
>> when it
>> comes to these re-occurring events that I struggle a little. The idea is
>> that I would have 5 core repetitions, none, daily, weekly, monthly and
>> annually.
> 
> This will not solve all your problems, but a very convenient way of
> handling XML is the element tree module (that comes with python 2.5):
> http://docs.python.org/lib/module-xml.etree.ElementTree.html
> 
> HTH,
> Daniel
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Re: Feedback on Until recipe

[Antoon Pardon]

On 2007-04-26, MRAB <[EMAIL PROTECTED]> wrote:

> At http://mail.python.org/pipermail/python-dev/2006-February/060718.html
> Raymond Hettinger suggested removing the final colon after the 'while'
> if there's no statement after it, which I agree with, although I would
> prefer 'repeat' instead of 'do' (IMHO that doesn't suggest repetition
> clearly enough):
>
> repeat:
> statements
> while condition:
> statements
>
> and:
>
> repeat:
> statements
> while condition

I wouldn't object to this. But more important than how it will look like
IMO is that it gets implemented. Acoording to your URL there is little
chance that this will be implemented before Py3k. A pity.

-- 
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Re: regex question

[Josiah Carlson]

proctor wrote:
> i have a regex:  rx_test = re.compile('/x([^x])*x/')

You probably want...

rx_test = re.compile('/x([^x]*)x/')


  - Josiah
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Re: regex question

[Paul McGuire]

On Apr 27, 1:33 am, proctor <[EMAIL PROTECTED]> wrote:
> hello,
>
> i have a regex:  rx_test = re.compile('/x([^x])*x/')
>
> which is part of this test program:
>
> 
>
> import re
>
> rx_test = re.compile('/x([^x])*x/')
>
> s = '/xabcx/'
>
> if rx_test.findall(s):
> print rx_test.findall(s)
>
> 
>
> i expect the output to be ['abc'] however it gives me only the last
> single character in the group: ['c']
>
> C:\test>python retest.py
> ['c']
>
> can anyone point out why this is occurring?  i can capture the entire
> group by doing this:
>
> rx_test = re.compile('/x([^x]+)*x/')
> but why isn't the 'star' grabbing the whole group?  and why isn't each
> letter 'a', 'b', and 'c' present, either individually, or as a group
> (group is expected)?
>
> any clarification is appreciated!
>
> sincerely,
> proctor

As Josiah already pointed out, the * needs to be inside the grouping
parens.

Since re's do lookahead/backtracking, you can also write:

rx_test = re.compile('/x(.*?)x/')

The '?' is there to make sure the .* repetition stops at the first
occurrence of x/.

-- Paul

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List objects are un-hashable

[Andy]

Hi, I'm trying to search and print any no# of Python keywords present
in a text file (say - foo.txt), and getting the above error. Sad for
not being able to decipher such a simple problem (I can come up with
other ways - but want to fix this one FFS). Any help is appreciated.
Thanks!!

import keyword, re, sys, string
inp = open("foo.txt", "r")
words,lines = 0, 0

for line in inp:
lines +=1
# a list of words
tempwords = line.split(None)
if keyword.iskeyword(tempwords):
print tempwords

inp.close()

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RE: : Re-ocurring Events

[Robert Rawlins - Think Blue]

Just as another quick update, I've found this module for python that may be
able to help me, its designed to spot date patterns for things like
recurring events I guess,

http://www.biostat.wisc.edu/~annis/creations/period.py.html

Quite how I can integrate it into my project I'm not sure but if I can loop
through each of the events in my XML and see if they are meant to be
recurring today then that's fantastic.

If anyone has any rough ideas on how this might work for me I'd love to hear
some rough concepts.

Thanks,

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Robert Rawlins - Think Blue
Sent: 27 April 2007 08:24
To: python-list@python.org
Subject: RE:: Re-ocurring Events

Thank you guys for your suggestions.

I've been having a look at that launchd stuff from apple but couldn’t really
see how that applies to my requirements.

I've been putting some serious thought into how this should work as its
essentially the final part of the puzzle for my application, I'll have a
fully working model for my application.

I've been thinking about the possibility of using a combination of xpath to
search the XML with some loops which change the date. As events won't ever
be set to start before 01-01-2007 I can set that as the ceiling for my loop.
So when I'm searching for weekly events, I 'simply' take today's date and
time and loop from now until 01-01-2007 decrementing the date by a week each
iteration of the loop and then search the XML for events in that date, make
sense?

I know that's a fairly intensive way of doing it, but if it works it works.

Now, the loop is where I'm really struggling, I've not done any looping with
dates, can anyone give me a hand with this? How can I loop back in time from
now to beginning of 07 a week at a time? Do we have some form of dateAdd() I
can use with a while loop? Perhaps.

Date = (now)
While date > 2007-01-01:
Date = dateAdd(date, -1, w)

Something to that effect? Then I can quickly xpath for every iteration of
the loop.

Thanks guys for any help.

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Laurent Pointal
Sent: 26 April 2007 15:33
To: python-list@python.org
Subject: Re: Re-ocurring Events

Daniel Nogradi a écrit :
>> A bit more of a complex one this time, and I thought I'd get your 
>> opinions
>> on the best way to achieve this. Basically I'm looking for a way to 
>> describe
>> a re-occurring event, like a calendar event or appointment I guess. I'm
>> likely to use an XML file for the definition of the events, but 
>> imagine I've
>> got an event that looks something like this.
>>
>> > repeat="daily"
>> />

May take a look at launchd (Apple) XML dialect, it may have at least the 
semantic for your need.

For other parts... elementtree, yes.

>> Now what I want to do is be able to build a class which has a function 
>> like
>> 'getCurrentEvent()' which will return any events that should be 
>> occurring at
>> that time. So if the current system time and date is 2007-01-03 13:00:00
>> then it will return THAT event to me, but if it was say 2007-01-03 
>> 16:00:00
>> then it would not, as the event isn't 'due' to occur at that time. Make
>> sense?
>>
>> What's the best way of handling this? I'm really a little lost as to 
>> how I
>> might get started, checking a static date time isn't a problem, it's 
>> when it
>> comes to these re-occurring events that I struggle a little. The idea is
>> that I would have 5 core repetitions, none, daily, weekly, monthly and
>> annually.
> 
> This will not solve all your problems, but a very convenient way of
> handling XML is the element tree module (that comes with python 2.5):
> http://docs.python.org/lib/module-xml.etree.ElementTree.html
> 
> HTH,
> Daniel
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Re: List objects are un-hashable

[Alexander Schmolck]

Andy <[EMAIL PROTECTED]> writes:

> Hi, I'm trying to search and print any no# of Python keywords present
> in a text file (say - foo.txt), and getting the above error. Sad for
> not being able to decipher such a simple problem (I can come up with

Without looking at the docs, it seems save to assume keywords.iskeyword would
expect a string. You pass it a list.

> other ways - but want to fix this one FFS). Any help is appreciated.
> Thanks!!
>
> import keyword, re, sys, string
> inp = open("foo.txt", "r")
  words = sum(1 for line in inp for w in line.split() if keyword.iskeyword(w))

'as
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Re: List objects are un-hashable

[Ant]

> for line in inp:
> lines +=1
> # a list of words
> tempwords = line.split(None)
> if keyword.iskeyword(tempwords):
> print tempwords

You are trying here to ask if a list of words (tempwords) is a
keyword. The error is due to the implementation of the iskeyword
function which converts the keyword list into a frozenset (in which
elements must be hashable) for, I presume, performance reasons:

>>> f_set = frozenset((1,2,3,4))
>>> ["test"] in f_set
Traceback (most recent call last):
  File "", line 1, in 
TypeError: list objects are unhashable

What you want is something like:

 for line in inp:
 lines +=1
 # a list of words
 tempwords = line.split()
 for k in tempwords:
 if keyword.iskeyword(k):
print tempwords

Which iterates over each word in your tempwords list in turn. Note
though the following:

>>> if(True):print"Hey!"
...
Hey!
>>> s = 'if(True):print"Hey!"'
>>> s.split()
['if(True):print"Hey!"']

Which may be a problem for you if you are trying to parse badly spaced
python source files!

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Re: List objects are un-hashable

[Andy]

> What you want is something like:
>
>  for line in inp:
>  lines +=1
>  # a list of words
>  tempwords = line.split()
>  for k in tempwords:
>  if keyword.iskeyword(k):
> print tempwords


I think it should be:

 if keyword.iskeyword(k):
  print k

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Re: List objects are un-hashable

[Ant]

> I think it should be:
>
>  if keyword.iskeyword(k):
>   print k

Whoops - yes of course!

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Re: List objects are un-hashable

[Ganesan Rajagopal]

> "Andy" == Andy  <[EMAIL PROTECTED]> writes:

> if keyword.iskeyword(tempwords):
> print tempwords

  for word in tempwords:
  if keyword.iskeyword(word):
  print word

Ganesan 


-- 
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Re: List objects are un-hashable

[Michael Hoffman]

Andy wrote:
> Hi, I'm trying to search and print any no# of Python keywords present
> in a text file (say - foo.txt), and getting the above error. Sad for
> not being able to decipher such a simple problem (I can come up with
> other ways - but want to fix this one FFS).

It helps a lot of if you post the traceback with your problem. The line 
it occurred on is crucial for debugging.

But I will use my psychic debugger which tells me that the error is here:

> if keyword.iskeyword(tempwords):

tempwords is a list. You need to iterate over the contents of the list 
and run keyword.iskeyword() for each one. Here's an example for Python 
2.5. I've cleaned up some extra lines of code that didn't have any 
eventual effects in your current implementation

from __future__ import with_statement

import keyword

INFILENAME = "foo.txt"

with open(INFILENAME) as infile:
 for line in infile:
 words = line.split()
 for word in words:
 if keyword.iskeyword(word):
 print word

This will print multiple lines per input line. If you wanted one line 
per input line then try:

with open(INFILENAME) as infile:
 for line in infile:
 words = line.split()
 print " ".join(word for word in words
if keyword.iskeyword(word))
-- 
Michael Hoffman
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RE: Re-ocurring Events

[Robert Rawlins - Think Blue]

Thanks for getting back to me Laurent.

I've now made some pretty tidy progress on this and -think- it's going to
shape up nicely, I'm just working on converting my date strings from the XML
into a date_struct and we should be good to go.

I'll keep you all posted.

Rob

-Original Message-
From: Laurent Pointal [mailto:[EMAIL PROTECTED] 
Sent: 27 April 2007 09:49
To: Robert Rawlins - Think Blue
Subject: Re: Re-ocurring Events

Robert Rawlins - Think Blue a écrit :
> Thank you guys for your suggestions.
> 
> I've been having a look at that launchd stuff from apple but couldn’t
really
> see how that applies to my requirements.

I was not thinking about launchd itself, but about its XML configuration 
files which manage timed events, as you need.

> I've been putting some serious thought into how this should work as its
> essentially the final part of the puzzle for my application, I'll have a
> fully working model for my application.
> 
> I've been thinking about the possibility of using a combination of xpath
to
> search the XML with some loops which change the date. As events won't ever
> be set to start before 01-01-2007 I can set that as the ceiling for my
loop.
> So when I'm searching for weekly events, I 'simply' take today's date and
> time and loop from now until 01-01-2007 decrementing the date by a week
each
> iteration of the loop and then search the XML for events in that date,
make
> sense?
> 
> I know that's a fairly intensive way of doing it, but if it works it
works.
> 
> Now, the loop is where I'm really struggling, I've not done any looping
with
> dates, can anyone give me a hand with this? How can I loop back in time
from
> now to beginning of 07 a week at a time? Do we have some form of dateAdd()
I
> can use with a while loop? Perhaps.

See datetime module, eventually third party mxDatetime.

> Date = (now)
> While date > 2007-01-01:
>   Date = dateAdd(date, -1, w)
> 
> Something to that effect? Then I can quickly xpath for every iteration of
> the loop.

A+

Laurent.

-- 
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CNRS-LIMSI dépt. CHM, groupes AMI et PS
Courriel: [EMAIL PROTECTED](prof)
   [EMAIL PROTECTED] (perso)
Ouebe: http://www.limsi.fr/Individu/pointal/
Tél. 01 69 85 81 06 (prof)
Fax. 01 69 85 80 88



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Re: Tutorial creates confusion about slices

[Antoon Pardon]

On 2007-04-26, Steve Holden <[EMAIL PROTECTED]> wrote:
> Antoon Pardon wrote:
>> On 2007-04-25, Steve Holden <[EMAIL PROTECTED]> wrote:
> [...]

>>> Most people reading a tutorial are aware that they are being given the 
>>> knowledge they need to put the subject matter to immediate use, and that 
>>> there may well be refinements that are glossed over or covered in detail 
>>> later or elsewhere.
>> 
>> I agree with that.
>> 
>> However there is a difference between information that will help you
>> on the way now that will be refined later and information that will
>> help you on the way now and will be contradicted later.
>> 
>> I also understand that the line between the two is rather fuzzy.
>> 
>> In my opinion the text in the tutorial as it stands now, is more
>> of the latter than of the former type and that is why I would
>> prefer a change.
>> 
> I had already deduced that from your arguments so far in this thread. Do 
> you *have* to make every trivial conclusion explicit?

Well my problem was I had the feeling your remark totally ignored that.

I honestly don't understand what you thought your remark would
contribute if you had deduced the above.

It is very possible that this is a failing of mine in recognizing
when people have understood the point I am trying to make.

> Warning: this is an explicit test to see whether you can sit on your 
> hands and refrain from replying. It's hard to find a thread where you 
> don't make the last comment on every branch you get involved in.

Well I guess I failed.

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Re: key detect

[hlubenow]

Alex Taslab wrote:

> Hi everybody, does anyone know how to detect a key press from a
> keyboard. Well I do know how to do that, but i need to detect just one
> press and ignore the others. I mean, my program checks an input from the
> outside (a sensor) and i emulate that signal as a keypress, but the
> sensor doesn`t send the signal as a unique pulse y just keeps sending
> signal during some seconds, so that is like to be pressing one key for a
> period of time. How can i take that first press of a key and ignore the
> others? I am using pygtk. thanks everybody!

Perhaps you could emulate the sensor-signal as something else than a
keypress, perhaps pipe the event-data into some temporary file or so.

H.
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Re: webbrowser.open works in IDLE and cmd shell but not from cygwin prompt

[Michael Hoffman]

Gregory Bloom wrote:
> I'm running Python 2.5 under Windows.  If I fire up IDLE and enter:
> 
 import webbrowser
 url = 'http://www.python.org'
 webbrowser.open_new(url)
> 
> it works like a champ, opening the page in Firefox.  Same thing goes
> from a Windows cmd shell: it works as advertised.
> 
> But if I open a cygwin bash shell and try the same thing from a python
> prompt, I get:
> 
 import webbrowser
 url = 'http://www.python.org'
 webbrowser.open_new(url)
> Traceback (most recent call last):
>   File "", line 1, in 
>   File "C:\Python25\lib\webbrowser.py", line 60, in open_new
> return open(url, 1)
>   File "C:\Python25\lib\webbrowser.py", line 55, in open
> if browser.open(url, new, autoraise):
>   File "C:\Python25\lib\webbrowser.py", line 185, in open
> p = subprocess.Popen(cmdline, close_fds=True, preexec_fn=setsid)
>   File "C:\Python25\lib\subprocess.py", line 551, in __init__
> raise ValueError("close_fds is not supported on Windows "
> ValueError: close_fds is not supported on Windows platforms
> 
> What's up with that?

It's not a Cygwin issue, really. This occurs when one of ["firefox", 
"firebird", "seamonkey", "mozilla", "netscape", "opera"] is in your 
path. Your Cygwin environment must be set so one of these is in your 
path when it isn't normally.

You should also submit a bug.

> And, more to the point, how can I use webbrowser from scripts launched under
 > cygwin?

If you're using native Windows Python as you seem to be, try 
webbrowser.get("windows-default").open_new(url)

If you want to use Cygwin Python instead, I submitted a patch more than 
1.5 years ago to allow it, but it hasn't been reviewed:

http://python.org/sf/1244861
-- 
Michael Hoffman
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How can I save command prompt screen

[ozan SARI]

Hi ,

I  run  a  python  acript   with os.system('script.py')

I  want   save command prompt screen  in  a  text file (everything )   how
can  I  do  this?

Thanks   for your  help


Ozan
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what python technology for my app?

[Chris]

I have an database containing lots of numerical data. I want to write a 
browser based interface that will allow selection of various key 
parameters and yield tables, plots and/or printouts of the data 
according to the selections. Ultimately I want this to run on an 
intranet so that others can get access via their browsers.

The application is for in-house use only and not likely to have more 
than a few users at any one time. I've managed to hack out enough 
understanding of sql and sqlAlchemy over the last couple of days to 
create and access an sqlite3 based database for my data. This seems to 
suit my purposes for now. Now for a front end and some simple 
distribution over a network.

I have written some small Wxpython & matplotlib apps for data analysis 
and display but I'm not sure how these would work in a browser based 
world, or even if they are appropriate.

Any advice on what technologies I should be looking at for this? Python 
based naturally, and hopefully simple and lightweight. I'm not a 
programmer by trade and that's not what I really get paid for but I've 
learned to love python and its myriad of modules for all the data 
analysis work I need to do. If I can throw something moderately 
functional together in a week or two (along with all the learning that 
entails) I'll be happy.

btw - Platform needs to be windows because that's what on my desk.

thanks.
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Re: My python annoyances so far

[Bruno Desthuilliers]

[EMAIL PROTECTED] a écrit :
(snip)
> 
> Well, why do some things in the library have to be functions, and
> other things have to be class methods?
 > Why aren't they all just either functions or class methods? like
 > perhaps ruby.
 >

If I tell you that Python's functions are in fact static methods of 
their module, will this make you happy ? Because, while not technically 
true, this is conceptually equivalent.

Or if you prefer to stick to technical truth, python's methods are 
nothing more than a thin decorator around a function object (yes, 
Python's functions *are* objects) - so in fact, there are *only* 
functions - sometimes wrapped into a method object, sometimes not, 
depending on how you access them.

In both cases, the fact that you don't have enough knowledge of a 
language to understand it's design, and/or the fact that this design is 
different from other one you already know, doesn't by itself make this 
design an "annoyance".


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RE: Re-ocurring Events

[Robert Rawlins - Think Blue]

Ok, Almost done now, it seems to be working a real charm at the moment.

I need a little help on performing a quick if statement against a date
string. I have couple of date strings returned by

s.attributes.getNamedItem("start").nodeValue
s.attributes.getNamedItem("end").nodeValue

and I need to do and conditional that ensures start is before today's
date/time and end is after today's date/time.

The string looks like: '2007-01-01 00:00:00'

Do I have to convert this to a proper time object to do the comparison? Or
can I do it as a string?

Thanks,

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Robert Rawlins - Think Blue
Sent: 27 April 2007 09:55
To: 'Laurent Pointal'
Cc: python-list@python.org
Subject: RE: Re-ocurring Events

Thanks for getting back to me Laurent.

I've now made some pretty tidy progress on this and -think- it's going to
shape up nicely, I'm just working on converting my date strings from the XML
into a date_struct and we should be good to go.

I'll keep you all posted.

Rob

-Original Message-
From: Laurent Pointal [mailto:[EMAIL PROTECTED] 
Sent: 27 April 2007 09:49
To: Robert Rawlins - Think Blue
Subject: Re: Re-ocurring Events

Robert Rawlins - Think Blue a écrit :
> Thank you guys for your suggestions.
> 
> I've been having a look at that launchd stuff from apple but couldn’t
really
> see how that applies to my requirements.

I was not thinking about launchd itself, but about its XML configuration 
files which manage timed events, as you need.

> I've been putting some serious thought into how this should work as its
> essentially the final part of the puzzle for my application, I'll have a
> fully working model for my application.
> 
> I've been thinking about the possibility of using a combination of xpath
to
> search the XML with some loops which change the date. As events won't ever
> be set to start before 01-01-2007 I can set that as the ceiling for my
loop.
> So when I'm searching for weekly events, I 'simply' take today's date and
> time and loop from now until 01-01-2007 decrementing the date by a week
each
> iteration of the loop and then search the XML for events in that date,
make
> sense?
> 
> I know that's a fairly intensive way of doing it, but if it works it
works.
> 
> Now, the loop is where I'm really struggling, I've not done any looping
with
> dates, can anyone give me a hand with this? How can I loop back in time
from
> now to beginning of 07 a week at a time? Do we have some form of dateAdd()
I
> can use with a while loop? Perhaps.

See datetime module, eventually third party mxDatetime.

> Date = (now)
> While date > 2007-01-01:
>   Date = dateAdd(date, -1, w)
> 
> Something to that effect? Then I can quickly xpath for every iteration of
> the loop.

A+

Laurent.

-- 
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CNRS-LIMSI dépt. CHM, groupes AMI et PS
Courriel: [EMAIL PROTECTED](prof)
   [EMAIL PROTECTED] (perso)
Ouebe: http://www.limsi.fr/Individu/pointal/
Tél. 01 69 85 81 06 (prof)
Fax. 01 69 85 80 88



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Re: My python annoyances so far

[Bruno Desthuilliers]

Marc 'BlackJack' Rintsch a écrit :
> In <[EMAIL PROTECTED]>, Steven Howe
> wrote:
> 
>> And before someone get's all technical, I know everything in Python is 
>> an 'object' even None, which implies class, or is it the other way around?
> 
> Objects don't imply classes.  There are object oriented languages without
> classes like the Io language.  Everything there is an object and the base
> object has a `clone()` method to make a copy.  So you make copies of
> objects and modify them to tweak them into the way you want them.

And FWIW, in Python, classes are objects too, and are attributes of 
their instances. Which makes Python quite close to prototype-based 
languages like Io, Self or Javascript.
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Re: *** Dr G Polya BRILLIANTLY analyses the Virgina Shooting Incident ***

[Fred Bloggs]

[EMAIL PROTECTED] wrote:
> On Apr 24, 2:09 pm, Quadibloc <[EMAIL PROTECTED]> wrote:
> 
>>The Real Andy wrote:
>>
>>>Makes me wonder about the credibility of any statement Dr Gideon Polya
>>>makes.
>>
>>.
>>I never thought that I would feel the urge to call someone an
>>edelweiss-eating Tanzanian devil, but Dr. Polya proved that I lacked
>>imagination.
>>
>>(Note that "Tanzanian" is pronounced Tan.zan._ee_.yan, not
>>Tan._zayn_.ee.an; one wouldn't want to spoil the effect.)
> 
> 
> What really spoils the effect is that Dr. Polya lives in Tasmania, a
> state of Australia, and not in Tanzania, which is a country in East
> Africa.
> 
> Semi-literate Americans do tend to confuse the two places, as they
> also tend confuse Australia and Austria. Oddly enough, edelweiss grows
> in Austria, so Dr. Polya would have to import it from Europe if he
> were in the habit of dining on edelweiss - which would be an eccentric
> habit, even in Austria, where the flower doesn't form part of the
> normal diet.
> 
> --
> Bill Sloman, Nijmegen
> 

Is there any civilized life in Tasmania? It looks like just another 
natural wonderland that was raped, pillaged, exploited for its 
resources, and left behind. Even the official tourism site makes the 
place seem dull and bereft of any kind of enthusiasm, warning the 
prospective visitor that life is slow there. I did not know Erol Flynn 
was from there. That's something anyway. They might consider making his 
boyhood home a museum or something. And was that Gunn Forestry you know 
so well?

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Re: My python annoyances so far

[Bruno Desthuilliers]

7stud a écrit :
> [EMAIL PROTECTED] wrote:
>> Annoyances:
>>
> 
> Every language has annoyances.  Python is no exception.  

Sure. But we may disagree on what are actually Python's annoyances !-)

> Post away.
> Anyone that is offended can go drink a Guinness.
> 
>> 1. Underscores! What's the deal with that? Especially those double
>> underscores. The best answer I read on this is that the double
>> underscores denotes special methods that the interpreter may
>> automatically use. For example, 4+4 get expanded by the interpreter to
>> 4.__add__(4).
>>
> 
> I thought those were pretty ugly myself.  Now, I am used to them.

FWIW, you shouldn't have to directly use __magic__ methods - or only in 
very special corner cases.

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Re: How to find complementary colour for pixel

[Laurent Pointal]

Steven D'Aprano a écrit :
> I shouldn't think so... I always forget if black is all ones or all
> zeroes, so I checked here: http://www.pitt.edu/~nisg/cis/web/cgi/rgb.html

For this I use the mnemotechnics idea of "chromatic coil" [*], when 
there are *all* colors turning it appear to be *white*. And *no* color 
is then *black*.



[*] Babelfish translation for french "roue chromatique"
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Re: How to find complementary colour for pixel

[Steven D'Aprano]

On Thu, 26 Apr 2007 21:17:42 -0700, James Stroud wrote:

> Johny wrote:
>>  I use PIL to write some text to a picture.The text must  be seen wery
>> clearly.
>> I write the text to different pictures but to the same position. As 
>> pictures maybe  different, colour, in the position where I write the
>> text, is also different.
>> Is there a way how to set the font colour so that it will be seen very
>> clearly in the picture?
>> For example, if the picture is bright ( for example yellow), the font
>> colour should be dark( e.g. black) and vice versa.
>> Is there a routine in PIL available  that calculates complementary
>> colour for RGB pixel format?
>> Can anyone help?
>> Thanks
>> L.
>> 
> 
> Don't you just xor with black?

I shouldn't think so... I always forget if black is all ones or all
zeroes, so I checked here: http://www.pitt.edu/~nisg/cis/web/cgi/rgb.html

>>> black = 0x00 # RGB colours
>>> white = 0xff
>>> black^black == white
False
>>> white^black == black
False

Maybe you meant xor with white?

But even so, I gather that the Original Poster is asking for something
slightly different -- despite his mention of complimentary colours. (Or
maybe I'm just reading too much into it?)

I think he's just looking for one colour which has high contrast over a
bunch of pixels in an image. I don't think that can be done, in general:
it seems to me he's assuming that all the pixels in the area he wants
to overlay text on are "nearly" the same colour.

I think that a better solution is to draw a box around the area you
want to write text into. The box should have a contrasting frame:
say, a thin white border followed by a thin black border just inside it:
either the white or the black will contrast with the background, no matter
what colour(s) the background is, since no area can be both black and
white in the same place. Then fill the frame with white, and draw black
text inside it. Nice high contrast.

That is probably the most readable method of placing text over an image.


-- 
Steven D'Aprano 

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Re: what python technology for my app?

[Bruno Desthuilliers]

Chris a écrit :
> I have an database containing lots of numerical data. I want to write a 
> browser based interface that will allow selection of various key 
> parameters and yield tables, plots and/or printouts of the data 
> according to the selections. Ultimately I want this to run on an 
> intranet so that others can get access via their browsers.
> 
> The application is for in-house use only and not likely to have more 
> than a few users at any one time. I've managed to hack out enough 
> understanding of sql and sqlAlchemy over the last couple of days to 
> create and access an sqlite3 based database for my data. This seems to 
> suit my purposes for now. Now for a front end and some simple 
> distribution over a network.
> 
> I have written some small Wxpython & matplotlib apps for data analysis 
> and display but I'm not sure how these would work in a browser based 
> world, or even if they are appropriate.

wxPython being a GUI toolkit, it's of course not really appropriate for 
a web-based solution (and yes, this is an understatement).

I don't have any experience with matplotlib, but according to the 
project's FAQ, this shouldn't be a problem:
http://matplotlib.sourceforge.net/faq.html#BATCHMODE

> 
> Any advice on what technologies I should be looking at for this? Python 
> based naturally, and hopefully simple and lightweight. I'm not a 
> programmer by trade and that's not what I really get paid for but I've 
> learned to love python and its myriad of modules for all the data 
> analysis work I need to do. If I can throw something moderately 
> functional together in a week or two (along with all the learning that 
> entails)

If you don't have any experience with web programming, it might take a 
bit more time.

> I'll be happy.

Pylons (http://pylonshq.com) and turbogears are two great web 
frameworks. Both support SQLAlchemy. My own favourite is Pylons, but you 
should try both and choose the one that better fits your brain.

> btw - Platform needs to be windows because that's what on my desk.

Python is mostly platform independant.

HTH
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RE: what python technology for my app?

[Robert Rawlins - Think Blue]

Just thought I'd make a little suggestion about this, I don’t know how
strict you want to be with the web development side of things, but I'm a web
developer by trade and have recently started using python for my non-web
type applications.

If you're looking for a web based server side solution, then you can't go
wrong with Adobe ColdFusion. Its and incredibly powerful and scalable
development platform and yet supports a simple tag based language which
makes life very easy when getting started, and yet will support much more
complex OOP methodology with a whole myriad of frameworks, orm's and object
factories.

For a quick 'run down' of its features take a look at the simple tutorials
on the adobe site, they'll demonstrate how easy it is to achieve even quite
complex tasks like PDF creation, animated statistical charts an all sorts.
As CF is a JAVA based technology you get the power of J2EE platform and its
perfectly multi platform playing nicely with linux, unix, sun, windows or
whatever server environment you wish to run it on.

Just my two pence, I'm a big CF fan so my opinions are no doubt bias, but
might be worth you taking a look.

http://www.adobe.com/uk/products/coldfusion/

Pay attention to the 'ColdFusion Demos' at the bottom right of the main
column.

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Bruno Desthuilliers
Sent: 27 April 2007 12:19
To: python-list@python.org
Subject: Re: what python technology for my app?

Chris a écrit :
> I have an database containing lots of numerical data. I want to write a 
> browser based interface that will allow selection of various key 
> parameters and yield tables, plots and/or printouts of the data 
> according to the selections. Ultimately I want this to run on an 
> intranet so that others can get access via their browsers.
> 
> The application is for in-house use only and not likely to have more 
> than a few users at any one time. I've managed to hack out enough 
> understanding of sql and sqlAlchemy over the last couple of days to 
> create and access an sqlite3 based database for my data. This seems to 
> suit my purposes for now. Now for a front end and some simple 
> distribution over a network.
> 
> I have written some small Wxpython & matplotlib apps for data analysis 
> and display but I'm not sure how these would work in a browser based 
> world, or even if they are appropriate.

wxPython being a GUI toolkit, it's of course not really appropriate for 
a web-based solution (and yes, this is an understatement).

I don't have any experience with matplotlib, but according to the 
project's FAQ, this shouldn't be a problem:
http://matplotlib.sourceforge.net/faq.html#BATCHMODE

> 
> Any advice on what technologies I should be looking at for this? Python 
> based naturally, and hopefully simple and lightweight. I'm not a 
> programmer by trade and that's not what I really get paid for but I've 
> learned to love python and its myriad of modules for all the data 
> analysis work I need to do. If I can throw something moderately 
> functional together in a week or two (along with all the learning that 
> entails)

If you don't have any experience with web programming, it might take a 
bit more time.

> I'll be happy.

Pylons (http://pylonshq.com) and turbogears are two great web 
frameworks. Both support SQLAlchemy. My own favourite is Pylons, but you 
should try both and choose the one that better fits your brain.

> btw - Platform needs to be windows because that's what on my desk.

Python is mostly platform independant.

HTH
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Re: My python annoyances so far

[Bjoern Schliessmann]

James Stroud wrote:

> Here is something on which to meditate: classes become functions
> when you get the quantum mechanics just so!

s/become/can behave like/

:)

Regards,


Björn

-- 
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radiosity depletion

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Re: Re-ocurring Events

[Jarek Zgoda]

Robert Rawlins - Think Blue napisał(a):

> and I need to do and conditional that ensures start is before today's
> date/time and end is after today's date/time.
> 
> The string looks like: '2007-01-01 00:00:00'
> 
> Do I have to convert this to a proper time object to do the comparison? Or
> can I do it as a string?

In the very specific case of string formatted as above, the string
comparison will give the same results as in the case of datetime objects
comparison. You just have to compare the same kinds of things. ;)

-- 
Jarek Zgoda

"We read Knuth so you don't have to."
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Re: My python annoyances so far

[Bjoern Schliessmann]

Steven D'Aprano wrote:

> Perhaps you should read about the Kingdom of Nouns:
>
>  execution-in-kingdom-of-nouns.html> 

Really cool. :) Thanks for sharing the link.

Regards,


Björn

-- 
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the router thinks its a printer.

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RE: Re-ocurring Events

[Robert Rawlins - Think Blue]

Thanks for that tip Jarek, It worked a charm, I just created a format time
string and used that in the compare against my XML and it work perfectly.

Thank you,

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Jarek Zgoda
Sent: 27 April 2007 13:01
To: python-list@python.org
Subject: Re: Re-ocurring Events

Robert Rawlins - Think Blue napisał(a):

> and I need to do and conditional that ensures start is before today's
> date/time and end is after today's date/time.
> 
> The string looks like: '2007-01-01 00:00:00'
> 
> Do I have to convert this to a proper time object to do the comparison? Or
> can I do it as a string?

In the very specific case of string formatted as above, the string
comparison will give the same results as in the case of datetime objects
comparison. You just have to compare the same kinds of things. ;)

-- 
Jarek Zgoda

"We read Knuth so you don't have to."
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Multiple select in wx.GenericDirCrtl

[Soren]

Hi!

Is it possible to do multiple file selections in a wx.GenericDirCtrl??

Thanks,
Soren

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creating an object from base class

[iogilvy]

i wish to have some extended functionality added to sockets

i can create my own socket class   class mysocket(socket.socket):

and all should be fine. Except, the sockets are created for me by the
accept method, listening on port. So how can i take the standard
socket created for me and create a 'mysocket'. I need a method that
will initialise any new properties i have added in my class, but how
can i change the class of the socket created?

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Re: Generalized range

[Beliavsky]

On Apr 27, 1:32 am, [EMAIL PROTECTED] (Alex Martelli) wrote:
> Michael Hoffman <[EMAIL PROTECTED]> wrote:
> > [EMAIL PROTECTED] wrote:
> > > Thanks - you have covered a fair bit of gorund here - I will modify
> > > myRange taking your suggestions into account. The one suggestion that
> > > I'm going to have to think through is repeatedly incrementing res.
>
> > > I deliberately did not use this as repeated addition can cause
> > > rounding errors to accumulate, making the loop run a little longer or
> > > shorter than necessary. I thought I would be far less likely to run
> > > into rounding issues with a multiplicative construct - hence my use of
> > > epsilon, and my question about an appropriate value for it
>
> > You are right about rounding issues--with a sufficiently small step, the
> > way I have done it, it could become an infinite loop. But you can still
> > do it with multiplication, without using an epsilon constant. How about
> > something like this:
>
> > index = 0
> > while res < maximum:
> >  yield minimum + (step * index)
> >  index += 1
>
> Absolutely (with your later correction of actually assigning res), MUCH
> better than the misguided attempts based on repeatedly adding 'step'.
>
> I've taught "numerical computing" in university, and I would have had to
> fail anybody who'd misunderstood floating-point computations badly
> enough to try that "+=step" idea (including, sigh, the coders of several 
> Fortran compilers who were popular at that time).

You may be referring to the Fortran DO loop with a REAL loop variable,
for example

do x=1.5,3.5,0.5
   print*,x
end do

This was part of standard Fortran 77, so one should blame the
standards committee, not the compiler writers. Very few features of
F77 were deleted in Fortran 95, but this was one of them. In practice,
nothing gets deleted from commercial Fortran compilers.

At the SciPy site http://www.scipy.org/Cookbook/OptimizationAndFitDemo1
there is some code

   1 from enthought.chaco.wx import plt
   2 from scipy import arange, optimize, special
   3
   4 plt.figure()
   5 plt.hold()
   6 w = []
   7 z = []
   8 x = arange(0,10,.01)
   9
  10 for k in arange(1,5,.5):
  11y = special.jv(k,x)
  12plt.plot(x,y)
  13f = lambda x: -special.jv(k,x)
  14x_max = optimize.fminbound(f,0,6)
  15w.append(x_max)
  16z.append(special.jv(k,x_max))
  17
  18 plt.plot(w,z, 'ro')
  19 from scipy import interpolate
  20 t = interpolate.splrep(w, z, k=3)
  21 s_fit3 = interpolate.splev(x,t)
  22 plt.plot(x,s_fit3, 'g-')
  23 t5 = interpolate.splrep(w, z, k=5)
  24 s_fit5 = interpolate.splev(x,t5)
  25 plt.plot(x,s_fit5, 'y-')

I think the use of arange with a non-integer increment is poor style,
for reasons discussed in this thread.

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Re: My python annoyances so far

[flifus]

On 26 Apr, 21:50, Bjoern Schliessmann  wrote:

> > like perhaps ruby.
>
> If I were rude, I would ask now why you don't use ruby. But I bet
> ruby has some annoyances ready for you too.
>
> Regards,
>
> Björn
>
Well, I'd use ruby but python is everywhere, and ruby isn't. All the
applications that interest me are scriptable in python, not ruby.

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Re: *** Dr G Polya BRILLIANTLY analyses the Virgina Shooting Incident ***

[bill . sloman]

On Apr 27, 12:59 pm, Fred Bloggs <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > On Apr 24, 2:09 pm, Quadibloc <[EMAIL PROTECTED]> wrote:
>
> >>The Real Andy wrote:
>
> >>>Makes me wonder about the credibility of any statement Dr Gideon Polya
> >>>makes.
>
> >>.
> >>I never thought that I would feel the urge to call someone an
> >>edelweiss-eating Tanzanian devil, but Dr. Polya proved that I lacked
> >>imagination.
>
> >>(Note that "Tanzanian" is pronounced Tan.zan._ee_.yan, not
> >>Tan._zayn_.ee.an; one wouldn't want to spoil the effect.)
>
> > What really spoils the effect is that Dr. Polya lives in Tasmania, a
> > state of Australia, and not in Tanzania, which is a country in East
> > Africa.
>
> > Semi-literate Americans do tend to confuse the two places, as they
> > also tend confuse Australia and Austria. Oddly enough, edelweiss grows
> > in Austria, so Dr. Polya would have to import it from Europe if he
> > were in the habit of dining on edelweiss - which would be an eccentric
> > habit, even in Austria, where the flower doesn't form part of the
> > normal diet.
>
> > --
> > Bill Sloman, Nijmegen
>
> Is there any civilized life in Tasmania? It looks like just another
> natural wonderland that was raped, pillaged, exploited for its
> resources, and left behind.

The pillaging and rapine continues. The Green Party has managed to
protect some of the more interesting elements of the ecology, but the
paper mills where my father was research manager for as long as we
lived in Tasmania continues to chop down a lot of trees. They liked to
claim that their wood felling was sustainable, but since the cycle of
felling and regrowth they had in mind at the time worked on a 200 year
cycle, and the business was set up in the late 1930s, there wasn't a
lot of farmed timber going into the wood chippers at the time. How it
works at the moment isn't clear - two hundred year old wood isn't
ideal for making paper.

>Even the official tourism site makes the
> place seem dull and bereft of any kind of enthusiasm, warning the
> prospective visitor that life is slow there.

The population is only around 350,000 on an island the size of
Ireland. The state has the highest fertility and the lowest rate of
population growth of all the Australian states - anybody who is any
good leaves, as I did, and pursues a career someplace where there are
careers worth pursuing.

> I did not know Erol Flynn was from there.

He was born there, but left Tasmania fairly early (like everybody
else) - his father, the "distinguished Australian marine biologist/
zoologist Prof. Theodore Thomson Flynn" was presumably working at the
University of Tasmania in Hobart in 1909.

>That's something anyway. They might consider making his
> boyhood home a museum or something. And was that Gunn Forestry you know
> so well.

I don't know anything about Gunn Forestry.

The Green Party obviously doesn't like it, but they do have a tendency
to describe 25-year-old regrowth forests as "virgin primeval
rainforest" because the lie plays better to their target audience than
would the more nuanced truth.

The paper mill where my father worked had to severely restrict the
proportion of old-growth wood - trunks more than four feet (1,2
metres) in diameter - because the lignin in the older wood contained a
relatively high proportion of some organic acid that messed up the
caustic soda recovery cycle - and IIRR preferentially logged regrowth
forests that had grown up in areas clear-felled after the first world
war in order to provide cattle-raising farms for soldiers coming back
from the First World War. The farms were not successful, and the land
rapidly went back to forest.

My father was the guy who worked out that a high proportion of old
wood was what messed up the soda recovery process, and he hired the
Norwegian chemist - Asbjorn Baklien - who worked out how the old wood
caused the problem. Asbjorn went on to a brilliant career with ICI and
Monash University.

http://www.asap.unimelb.edu.au/bsparcs/biogs/P003354b.htm

--
Bill Sloman, Nijmegen

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getting rid of EOL character ?

[stef]

hello,

In the previous language I used,
when reading a line by readline, the EOL character was removed.

Now I'm reading a text-file with CR+LF at the end of each line,
Datafile = open(filename,'r') 
line = Datafile.readline()

now this gives an extra empty line
print line

and what I expect that should be correct, remove CR+LF,
gives me one character too much removed
print line[,-2]

while this gives what I need ???
print line[,-1]

Is it correct that the 2 characters CR+LF are converted to 1 character ?
Is there a more automatic way to remove the EOL from the string ?

thanks,
Stef Mientki
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Re: Multiple select in wx.GenericDirCrtl

[kyosohma]

On Apr 27, 7:31 am, Soren <[EMAIL PROTECTED]> wrote:
> Hi!
>
> Is it possible to do multiple file selections in a wx.GenericDirCtrl??
>
> Thanks,
> Soren

I'm not finding anything. I do know you can select multiple files
using the FileDialog. You should email the wxPython users group
though. They may have a custom control or they will likely be able to
point you in the right direction.

http://www.wxpython.org/maillist.php

Mike

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Re: getting rid of EOL character ?

[Michael Hoffman]

stef wrote:
> hello,
> 
> In the previous language I used,
> when reading a line by readline, the EOL character was removed.
> 
> Now I'm reading a text-file with CR+LF at the end of each line,
>Datafile = open(filename,'r')line = Datafile.readline()
> 
> now this gives an extra empty line
>print line
> 
> and what I expect that should be correct, remove CR+LF,
> gives me one character too much removed
>print line[,-2]
> 
> while this gives what I need ???
>print line[,-1]
> 
> Is it correct that the 2 characters CR+LF are converted to 1 character ?
> Is there a more automatic way to remove the EOL from the string ?

line = line.rstrip("\r\n") should take care of it. If you leave out the 
parameter, it will strip out all whitespace at the end of the line, 
which is what I do in most cases.
-- 
Michael Hoffman
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Re: what python technology for my app?

[Bruno Desthuilliers]

Robert Rawlins - Think Blue a écrit :
> Just thought I'd make a little suggestion about this, I don’t know how
> strict you want to be with the web development side of things, but I'm a web
> developer by trade and have recently started using python for my non-web
> type applications.
> 
> If you're looking for a web based server side solution, then you can't go
> wrong with Adobe ColdFusion.

Err... is this a troll ?
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Re: what python technology for my app?

[Gerard Flanagan]

On Apr 27, 12:18 pm, Chris <[EMAIL PROTECTED]> wrote:
> I have an database containing lots of numerical data. I want to write a
> browser based interface that will allow selection of various key
> parameters and yield tables, plots and/or printouts of the data
> according to the selections. Ultimately I want this to run on an
> intranet so that others can get access via their browsers.
>
> The application is for in-house use only and not likely to have more
> than a few users at any one time.

> Any advice on what technologies I should be looking at for this? Python
> based naturally, and hopefully simple and lightweight.

> If I can throw something moderately
> functional together in a week or two (along with all the learning that
> entails) I'll be happy.
>
> btw - Platform needs to be windows because that's what on my desk.
>

1) for small intranet,
2) in Python,
3) dead simple,
4) runs on Windows

 - consider Karrigell: http://karrigell.sourceforge.net/en/front.htm

Gerard



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visit http://www.real-article.com/spyware/index.php

[hiruma222]

The www.real-article.com website provides a ton of information about
spyware. In addition, you will find extensive information on leading
spyware to help you on your way to success.

Please have a look at our spyware articles, products, resources, and
additional information located throughout www.real-article.com.

We strive to provide only quality articles, so if there is a specific
topic related to spyware that you would like us to cover, please
contact us at any time.

visit http://www.real-article.com/spyware/index.php

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RE: what python technology for my app?

[Robert Rawlins - Think Blue]

Haha, no Troll, just a shameless plug for my life's one true love ;-)

Rob

-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
On Behalf Of Bruno Desthuilliers
Sent: 27 April 2007 14:35
To: python-list@python.org
Subject: Re: what python technology for my app?

Robert Rawlins - Think Blue a écrit :
> Just thought I'd make a little suggestion about this, I don’t know how
> strict you want to be with the web development side of things, but I'm a
web
> developer by trade and have recently started using python for my non-web
> type applications.
> 
> If you're looking for a web based server side solution, then you can't go
> wrong with Adobe ColdFusion.

Err... is this a troll ?
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Re: Generalized range

[Alex Martelli]

Beliavsky <[EMAIL PROTECTED]> wrote:
   ...
> > I've taught "numerical computing" in university, and I would have had to
> > fail anybody who'd misunderstood floating-point computations badly
> > enough to try that "+=step" idea (including, sigh, the coders of several
> > Fortran compilers who were popular at that time).
> 
> You may be referring to the Fortran DO loop with a REAL loop variable,
> for example
> 
> do x=1.5,3.5,0.5
>print*,x
> end do
> 
> This was part of standard Fortran 77, so one should blame the
> standards committee, not the compiler writers. Very few features of

I was thinking of "Fortran IV" aka Fortran '66, where as I recall per
the standard you were _supposed_ to only use integers in a DO, but
several compilers supplied real loop variables as an extension, and got
its implementation wrong.


Alex
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Re: conditional print statement ?

[stef]

> or (untested):
>
> if Print_Info:
> def printOrNot(arg):
> print arg
> else:
> def printOrNot(arg):
> pass
>
> printOrNot(Datafile.readline())
>
>   
thanks for the creative solution, and indeed it does work ;-)

cheers,
Stef Mientki
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Re: getting rid of EOL character ?

[stef]

>
> line = line.rstrip("\r\n") should take care of it. If you leave out 
> the parameter, it will strip out all whitespace at the end of the 
> line, which is what I do in most cases.
thanks for the solution Michael,

cheers,
Stef
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Re: getting rid of EOL character ?

[Jim]

If you have a recent Python, see the documentation for open on the
library page for built-in functions.
  http://docs.python.org/lib/built-in-funcs.html

Jim

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Re: My python annoyances so far

[Bjoern Schliessmann]

[EMAIL PROTECTED] wrote:

> Well, I'd use ruby but python is everywhere, and ruby isn't. All
> the applications that interest me are scriptable in python, not
> ruby.

Pity that you don't comment core topics.

Regards,


Björn

-- 
BOFH excuse #289:

Interference between the keyboard and the chair.

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Re: regex question

[proctor]

On Apr 27, 1:33 am, Paul McGuire <[EMAIL PROTECTED]> wrote:
> On Apr 27, 1:33 am, proctor <[EMAIL PROTECTED]> wrote:
>
>
>
> > hello,
>
> > i have a regex:  rx_test = re.compile('/x([^x])*x/')
>
> > which is part of this test program:
>
> > 
>
> > import re
>
> > rx_test = re.compile('/x([^x])*x/')
>
> > s = '/xabcx/'
>
> > if rx_test.findall(s):
> > print rx_test.findall(s)
>
> > 
>
> > i expect the output to be ['abc'] however it gives me only the last
> > single character in the group: ['c']
>
> > C:\test>python retest.py
> > ['c']
>
> > can anyone point out why this is occurring?  i can capture the entire
> > group by doing this:
>
> > rx_test = re.compile('/x([^x]+)*x/')
> > but why isn't the 'star' grabbing the whole group?  and why isn't each
> > letter 'a', 'b', and 'c' present, either individually, or as a group
> > (group is expected)?
>
> > any clarification is appreciated!
>
> > sincerely,
> > proctor
>
> As Josiah already pointed out, the * needs to be inside the grouping
> parens.
>
> Since re's do lookahead/backtracking, you can also write:
>
> rx_test = re.compile('/x(.*?)x/')
>
> The '?' is there to make sure the .* repetition stops at the first
> occurrence of x/.
>
> -- Paul

i am working through an example from the oreilly book mastering
regular expressions (2nd edition) by jeffrey friedl.  my post was a
snippet from a regex to match C comments.   every 'x' in the regex
represents a 'star' in actual usage, so that backslash escaping is not
needed in the example (on page 275).  it looks like this:

===

/x([^x]|x+[^/x])*x+/

it is supposed to match '/x', the opening delimiter, then

(
either anything that is 'not x',

or,

'x' one or more times, 'not followed by a slash or an x'
) any number of times (the 'star')

followed finally by the closing delimiter.

===

this does not seem to work in python the way i understand it should
from the book, and i simplified the example in my first post to
concentrate on just one part of the alternation that i felt was not
acting as expected.

so my question remains, why doesn't the star quantifier seem to grab
all the data.  isn't findall() intended to return all matches?  i
would expect either 'abc' or 'a', 'b', 'c' or at least just
'a' (because that would be the first match).  why does it give only
one letter, and at that, the /last/ letter in the sequence??

thanks again for replying!

sincerely,
proctor

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Re: conditional print statement ?

[Paul McGuire]

On Apr 26, 7:31 am, Dustan <[EMAIL PROTECTED]> wrote:
> On Apr 26, 1:58 am, Antoon Pardon <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> > On 2007-04-25, Stef Mientki <[EMAIL PROTECTED]> wrote:
>
> > > hello,
>
> > > As part of a procedure I've a number sequences like this:
>
> > >
> > >  if Print_Info: print Datafile.readline()
> > >  else:Datafile.readline()
> > >
>
> > > Is there a more compressed way to write such a statement,
> > > especially I dislike the redundancy "Datafile.readline()".
>
> > > thanks,
> > > Stef Mientki
>
> > You could consider the following
>
> > def Print(arg):
> > print arg
>
> > def Noop(arg):
> > pass
>
> or (untested):
>
> if Print_Info:
> def printOrNot(arg):
> print arg
> else:
> def printOrNot(arg):
> pass
>
> printOrNot(Datafile.readline())
>
>
>
> > (Print if Print_Info else Noop) (Datafile.readline())
>
> > --
> > Antoon Pardon- Hide quoted text -
>
> - Show quoted text -- Hide quoted text -
>
> - Show quoted text -

The Enable/Disable decorators on the Python wiki (http://
wiki.python.org/moin/PythonDecoratorLibrary?highlight=%28decorator
%29#head-8298dbf9ac7325d9ef15e7130e676378bbbda572) help you do
something very similar, without having to replicate the function being
enabled/disabled.

@(disabled,enabled)[Print_Info]
def printOrNot(arg):
print arg

-- Paul

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Re: regex question

[Michael Hoffman]

proctor wrote:
> On Apr 27, 1:33 am, Paul McGuire <[EMAIL PROTECTED]> wrote:
>> On Apr 27, 1:33 am, proctor <[EMAIL PROTECTED]> wrote:

>>> rx_test = re.compile('/x([^x])*x/')
>>> s = '/xabcx/'
>>> if rx_test.findall(s):
>>> print rx_test.findall(s)
>>> 
>>> i expect the output to be ['abc'] however it gives me only the last
>>> single character in the group: ['c']
>
>> As Josiah already pointed out, the * needs to be inside the grouping
>> parens.

> so my question remains, why doesn't the star quantifier seem to grab
> all the data.

Because you didn't use it *inside* the group, as has been said twice. 
Let's take a simpler example:

 >>> import re
 >>> text = "xabc"
 >>> re_test1 = re.compile("x([^x])*")
 >>> re_test2 = re.compile("x([^x]*)")
 >>> re_test1.match(text).groups()
('c',)
 >>> re_test2.match(text).groups()
('abc',)

There are three places that match ([^x]) in text. But each time you find 
one you overwrite the previous example.

> isn't findall() intended to return all matches?

It returns all matches of the WHOLE pattern, /x([^x])*x/. Since you used 
a grouping parenthesis in there, it only returns one group from each 
pattern.

Back to my example:

 >>> re_test1.findall("xabcxaaaxabc")
['c', 'a', 'c']

Here it finds multiple matches, but only because the x occurs multiple 
times as well. In your example there is only one match.

> i would expect either 'abc' or 'a', 'b', 'c' or at least just
> 'a' (because that would be the first match).

You are essentially doing this:

group1 = "a"
group1 = "b"
group1 = "c"

After those three statements, you wouldn't expect group1 to be "abc" or 
"a". You'd expect it to be "c".
-- 
Michael Hoffman
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Re: regex question

[Duncan Booth]

proctor <[EMAIL PROTECTED]> wrote:

> so my question remains, why doesn't the star quantifier seem to grab
> all the data.  isn't findall() intended to return all matches?  i
> would expect either 'abc' or 'a', 'b', 'c' or at least just
> 'a' (because that would be the first match).  why does it give only
> one letter, and at that, the /last/ letter in the sequence??
> 
findall returns the matched groups. You get one group for each 
parenthesised sub-expression, and (the important bit) if a single 
parenthesised expression matches more than once the group only contains 
the last string which matched it.

Putting a star after a subexpression means that subexpression can match 
zero or more times, but each time it only matches a single character 
which is why your findall only returned the last character it matched.

You need to move the * inside the parentheses used to define the group, 
then the group will match only once but will include everything that it 
matched.

Consider:

>>> re.findall('(.)', 'abc')
['a', 'b', 'c']
>>> re.findall('(.)*', 'abc')
['c', '']
>>> re.findall('(.*)', 'abc')
['abc', '']

The first pattern finds a single character which findall manages to 
match 3 times.

The second pattern finds a group with a single character zero or more 
times in the pattern, so the first time it matches each of a,b,c in turn 
and returns the c, and then next time around we get an empty string when 
group matched zero times.

In the third pattern we are looking for a group with any number of 
characters in it. First time we get all of the string, then we get 
another empty match.
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Re: Command-line option equiv of PYTHONPATH

[Antoon Pardon]

On 2007-04-27, James Stroud <[EMAIL PROTECTED]> wrote:
> Rajesh wrote:
>> Hi,
>> 
>> The '-I' option adds the path to the list of directories that
>> contains modules that can be included in a script. I can use it as "#!/
>> usr/bin/perl -I" thereby not asking the user of
>> the script to set the  in their environment.
>> 
>> Is there any equivalent command-line option to the python binary or a
>> command-line version of PYTHONPATH?
>> 
>> Regards
>> Rajesh
>
> Why not just modify sys.path within the actual script?

Maybe because he has multiple versions of modules he wants to test his
script against.

-- 
Antoon Pardon
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Re: conditional print statement ?

[Duncan Booth]

Paul McGuire <[EMAIL PROTECTED]> wrote:

> The Enable/Disable decorators on the Python wiki (http://
> wiki.python.org/moin/PythonDecoratorLibrary?highlight=%28decorator
> %29#head-8298dbf9ac7325d9ef15e7130e676378bbbda572) help you do
> something very similar, without having to replicate the function being
> enabled/disabled.
> 
> @(disabled,enabled)[Print_Info]
> def printOrNot(arg):
> print arg
> 

Pardon me for asking, but isn't that a syntax error? Decorator syntax is:

"@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE

and you don't have a dotted_name.
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Re: regex question

[Paul McGuire]

On Apr 27, 9:10 am, proctor <[EMAIL PROTECTED]> wrote:
> On Apr 27, 1:33 am, Paul McGuire <[EMAIL PROTECTED]> wrote:
>
>
>
>
>
> > On Apr 27, 1:33 am, proctor <[EMAIL PROTECTED]> wrote:
>
> > > hello,
>
> > > i have a regex:  rx_test = re.compile('/x([^x])*x/')
>
> > > which is part of this test program:
>
> > > 
>
> > > import re
>
> > > rx_test = re.compile('/x([^x])*x/')
>
> > > s = '/xabcx/'
>
> > > if rx_test.findall(s):
> > > print rx_test.findall(s)
>
> > > 
>
> > > i expect the output to be ['abc'] however it gives me only the last
> > > single character in the group: ['c']
>
> > > C:\test>python retest.py
> > > ['c']
>
> > > can anyone point out why this is occurring?  i can capture the entire
> > > group by doing this:
>
> > > rx_test = re.compile('/x([^x]+)*x/')
> > > but why isn't the 'star' grabbing the whole group?  and why isn't each
> > > letter 'a', 'b', and 'c' present, either individually, or as a group
> > > (group is expected)?
>
> > > any clarification is appreciated!
>
> > > sincerely,
> > > proctor
>
> > As Josiah already pointed out, the * needs to be inside the grouping
> > parens.
>
> > Since re's do lookahead/backtracking, you can also write:
>
> > rx_test = re.compile('/x(.*?)x/')
>
> > The '?' is there to make sure the .* repetition stops at the first
> > occurrence of x/.
>
> > -- Paul
>
> i am working through an example from the oreilly book mastering
> regular expressions (2nd edition) by jeffrey friedl.  my post was a
> snippet from a regex to match C comments.   every 'x' in the regex
> represents a 'star' in actual usage, so that backslash escaping is not
> needed in the example (on page 275).  it looks like this:
>
> ===
>
> /x([^x]|x+[^/x])*x+/
>
> it is supposed to match '/x', the opening delimiter, then
>
> (
> either anything that is 'not x',
>
> or,
>
> 'x' one or more times, 'not followed by a slash or an x'
> ) any number of times (the 'star')
>
> followed finally by the closing delimiter.
>
> ===
>
> this does not seem to work in python the way i understand it should
> from the book, and i simplified the example in my first post to
> concentrate on just one part of the alternation that i felt was not
> acting as expected.
>
> so my question remains, why doesn't the star quantifier seem to grab
> all the data.  isn't findall() intended to return all matches?  i
> would expect either 'abc' or 'a', 'b', 'c' or at least just
> 'a' (because that would be the first match).  why does it give only
> one letter, and at that, the /last/ letter in the sequence??
>
> thanks again for replying!
>
> sincerely,
> proctor- Hide quoted text -
>
> - Show quoted text -

Again, I'll repeat some earlier advice:  you need to move the '*'
inside the parens - you are still leaving it outside.  Also, get in
the habit of using raw literal notation (that is r"slkjdfljf" instead
of "lsjdlfkjs") when defining re strings - you don't have backslash
issues yet, but you will as soon as you start putting real '*'
characters in your expression.

However, when I test this,

restr = r'/x(([^x]|x+[^/])*)x+/'
re_ = re.compile(restr)
print re_.findall("/xabxxcx/ /x123xxx/")

findall now starts to give a tuple for each "comment",

[('abxxc', 'xxc'), ('123xx', 'xx')]

so you have gone beyond my limited re skill, and will need help from
someone else.

But I suggest you add some tests with multiple consecutive 'x'
characters in the middle of your comment, and multiple consecutive 'x'
characters before the trailing comment.  In fact, from my
recollections of trying to implement this type of comment recognizer
by hand a long time ago in a job far, far away, test with both even
and odd numbers of 'x' characters.

-- Paul

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Re: regex question

[proctor]

On Apr 27, 8:26 am, Michael Hoffman <[EMAIL PROTECTED]> wrote:
> proctor wrote:
> > On Apr 27, 1:33 am, Paul McGuire <[EMAIL PROTECTED]> wrote:
> >> On Apr 27, 1:33 am, proctor <[EMAIL PROTECTED]> wrote:
> >>> rx_test = re.compile('/x([^x])*x/')
> >>> s = '/xabcx/'
> >>> if rx_test.findall(s):
> >>> print rx_test.findall(s)
> >>> 
> >>> i expect the output to be ['abc'] however it gives me only the last
> >>> single character in the group: ['c']
>
> >> As Josiah already pointed out, the * needs to be inside the grouping
> >> parens.
> > so my question remains, why doesn't the star quantifier seem to grab
> > all the data.
>
> Because you didn't use it *inside* the group, as has been said twice.
> Let's take a simpler example:
>
>  >>> import re
>  >>> text = "xabc"
>  >>> re_test1 = re.compile("x([^x])*")
>  >>> re_test2 = re.compile("x([^x]*)")
>  >>> re_test1.match(text).groups()
> ('c',)
>  >>> re_test2.match(text).groups()
> ('abc',)
>
> There are three places that match ([^x]) in text. But each time you find
> one you overwrite the previous example.
>
> > isn't findall() intended to return all matches?
>
> It returns all matches of the WHOLE pattern, /x([^x])*x/. Since you used
> a grouping parenthesis in there, it only returns one group from each
> pattern.
>
> Back to my example:
>
>  >>> re_test1.findall("xabcxaaaxabc")
> ['c', 'a', 'c']
>
> Here it finds multiple matches, but only because the x occurs multiple
> times as well. In your example there is only one match.
>
> > i would expect either 'abc' or 'a', 'b', 'c' or at least just
> > 'a' (because that would be the first match).
>
> You are essentially doing this:
>
> group1 = "a"
> group1 = "b"
> group1 = "c"
>
> After those three statements, you wouldn't expect group1 to be "abc" or
> "a". You'd expect it to be "c".
> --
> Michael Hoffman

ok, thanks michael.

so i am now assuming that either the book's example assumes perl, and
perl is different from python in this regard, or, that the book's
example is faulty.  i understand all the examples given since my
question, and i know what i need to do to make it work.  i am raising
the question because the book says one thing, but the example is not
working for me.  i am searching for the source of the discrepancy.

i will try to research the differences between perl's and python's
regex engines.

thanks again,

sincerely,
proctor

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Re: getting rid of EOL character ?

[Steven Howe]

stef wrote:

hello,

In the previous language I used,
when reading a line by readline, the EOL character was removed.

Now I'm reading a text-file with CR+LF at the end of each line,
Datafile = open(filename,'r') 
line = Datafile.readline()


now this gives an extra empty line
print line

and what I expect that should be correct, remove CR+LF,
gives me one character too much removed
print line[,-2]

while this gives what I need ???
print line[,-1]

Is it correct that the 2 characters CR+LF are converted to 1 character ?
Is there a more automatic way to remove the EOL from the string ?

thanks,
Stef Mientki
  

>>> abcd = 'abcdedff . \n'
>>> abcd
'abcdedff . \n'
>>> print abcd
abcdedff .

>>>* from string import strip*
>>> print abcd.strip()
abcdedff .
>>> a = abcd.strip()
>>> a
'abcdedff .'
>>>

sph
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Re: regex question

[proctor]

On Apr 27, 8:37 am, Duncan Booth <[EMAIL PROTECTED]> wrote:
> proctor <[EMAIL PROTECTED]> wrote:
> > so my question remains, why doesn't the star quantifier seem to grab
> > all the data.  isn't findall() intended to return all matches?  i
> > would expect either 'abc' or 'a', 'b', 'c' or at least just
> > 'a' (because that would be the first match).  why does it give only
> > one letter, and at that, the /last/ letter in the sequence??
>
> findall returns the matched groups. You get one group for each
> parenthesised sub-expression, and (the important bit) if a single
> parenthesised expression matches more than once the group only contains
> the last string which matched it.
>
> Putting a star after a subexpression means that subexpression can match
> zero or more times, but each time it only matches a single character
> which is why your findall only returned the last character it matched.
>
> You need to move the * inside the parentheses used to define the group,
> then the group will match only once but will include everything that it
> matched.
>
> Consider:
>
> >>> re.findall('(.)', 'abc')
> ['a', 'b', 'c']
> >>> re.findall('(.)*', 'abc')
> ['c', '']
> >>> re.findall('(.*)', 'abc')
>
> ['abc', '']
>
> The first pattern finds a single character which findall manages to
> match 3 times.
>
> The second pattern finds a group with a single character zero or more
> times in the pattern, so the first time it matches each of a,b,c in turn
> and returns the c, and then next time around we get an empty string when
> group matched zero times.
>
> In the third pattern we are looking for a group with any number of
> characters in it. First time we get all of the string, then we get
> another empty match.

thank you this is interesting.  in the second example, where does the
'nothingness' match, at the end?  why does the regex 'run again' when
it has already matched everything?  and if it reports an empty match
along with a non-empty match, why only the two?

sincerely,
proctor

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Re: My python annoyances so far

[Antoon Pardon]

On 2007-04-27, Bruno Desthuilliers <[EMAIL PROTECTED]> wrote:
> 7stud a écrit :
>> [EMAIL PROTECTED] wrote:
>>> Annoyances:
>>>
>> 
>> Every language has annoyances.  Python is no exception.  
>
> Sure. But we may disagree on what are actually Python's annoyances !-)

That is probably why the subject says: "my annoyances"

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Re: How can I save command prompt screen

[Steven Howe]

ozan SARI wrote:

Hi ,
 
I  run  a  python  acript   with os.system('script.py')
 
I  want   save command prompt screen  in  a  text file (everything )   
how  can  I  do  this?
 
Thanks   for your  help
 
 
Ozan 
check out using the subprocess module 
http://docs.python.org/lib/node529.html  It seems 
to be the new
replacement for os.system spawn, popen  It has specific stdout, 
stderr and stdin handling.


sph

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Accessing SQL View with Python

[kyosohma]

Hi All,

I need to access a Microsoft SQL database View. Is there a way to do
this with Python? I have done a fair share of "googling" and found
nothing on accessing Views, just executing SQL, which I already know
how to do.

I am running Windows XP, Python 2.4.

Thanks a lot!

Mike

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Re: Accessing SQL View with Python

[Tim Golden]

[EMAIL PROTECTED] wrote:
> Hi All,
> 
> I need to access a Microsoft SQL database View. Is there a way to do
> this with Python? I have done a fair share of "googling" and found
> nothing on accessing Views, just executing SQL, which I already know
> how to do.
> 
> I am running Windows XP, Python 2.4.

Absolutely loads of ways. But (unless I'm missing
something here) they all involve executing SQL
which accesses a View (such as: SELECT * FROM v_info).
Have I missed the point of your question?

TJG
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building _tkinter module with .NET 2005?

[joshusdog]

I have the Python 2.5.1 source and I'm trying to build the debug
version of the _tkinter module. I've got .NET 2005 (Visual Studio 8)
but the instructions in the pcbuild\readme.txt file only contain
instructions for using .NET 2003 (Visual Studio 7.1). There's another
readme.txt file under the pcbuild8 directory, but is almost identical
to the one in the pcbuild folder. (There's some information about some
new instrumented build settings, but that's about it)

The instructions contained in both these readme.txt files say that the
Tcl, Tk, and Tix projects must be built from the command line first,
using nmake.exe in conjunction with the corresponding makefile.vc for
each package. I can get this to work using .NET 2003, but not
with .NET 2005. Is there an updated set of instructions somewhere for
doing this with .NET 2005? Is it even possible to get it to work with
the newer version of .NET?

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Re: Access to raw command line?

[Pieter Edelman]

Yes, but I want to make it less difficult for my end users, not more
difficult. I think the best is to require an extra switch for the
photo files, as some of the people here suggested.

On Apr 26, 6:27 pm, Grant Edwards <[EMAIL PROTECTED]> wrote:
> On 2007-04-26, Pieter Edelman <[EMAIL PROTECTED]> wrote:
>
> > All your posts pretty much confirmed my own thoughts on this subject.
> > Every option requires a specific action from the user, and as Bjoern
> > points out, it would differ from what everybody is used to.  I think
> > there's no trivial and reliable way to do this, so I can better leave
> > it the way it is (at least for now).
>
> Quoting things on the command line that you don't want the
> shell to expand is trivial and reliable.  It's also something
> than any shell user should know.
>
> --
> Grant Edwards   grante Yow! I wonder if there's
>   at   anything GOOD on tonight?
>visi.com


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Re: conditional print statement ?

[Paul McGuire]

On Apr 27, 9:45 am, Duncan Booth <[EMAIL PROTECTED]> wrote:
> Paul McGuire <[EMAIL PROTECTED]> wrote:
> > The Enable/Disable decorators on the Python wiki (http://
> > wiki.python.org/moin/PythonDecoratorLibrary?highlight=%28decorator
> > %29#head-8298dbf9ac7325d9ef15e7130e676378bbbda572) help you do
> > something very similar, without having to replicate the function being
> > enabled/disabled.
>
> > @(disabled,enabled)[Print_Info]
> > def printOrNot(arg):
> > print arg
>
> Pardon me for asking, but isn't that a syntax error? Decorator syntax is:
>
> "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
>
> and you don't have a dotted_name.

My bad.  The wiki example assigns the appropriate decorator to another
name, and then uses that name, like this:

debugFlag = int(False)
state = (disabled,enabled)[debugFlag]   # <-- proper way to do this

@state
def debugPrint(s):
print s

print "here comes some debug output"
debugPrint("xyzzy is the secret word")
print "that was it"


I think early in the decorator syntax discussions, there were some
proposals that decorators could be expressions, but I guess I forgot
which way that was decided.  The example in this post does work (and
so does the one on the wiki) .

-- Paul

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My newbie annoyances so far

[Paul McGuire]

Python is not VB and Python is not Java and Python is not Ruby and
Python is not any other language that is not Python.

1. Functions cannot be called without the parens (like in VB)

2. Python uses some naming conventions as programmer cues, such as
leading and trailing double-underscores to indicate some form of
specialness (I'm not overfond of relying on naming for this kind of
information encoding either, but I got used to it)

3. Python does not use braces to demarcate executable blocks of code,
or to define anonymous code blocks (like in Java, Ruby, or Smalltalk)

4. Python does not require every line of code to be enclosed within a
class (like in Java or Smalltalk)

5. Python does not do compile-time type checking on function arguments
or variable assignments (like in Java or C or C++) (yet... and will it
still be Python when it does?)

6. Python does not have interfaces to enforce object type
compatibility (like in Java)

Just because Python has features that are different from those in your
former language X does not mean it is deficient.  Python *might* be
deficient - ternary expressions are now part of the language after
years of refugees from C and C++ asking how to write "a = b ? c : d",
and now they'll get to puzzle/gripe over mapping this to "a = c if b
else d".  But as a newbie, you need to invest a little more time and
effort and study and reflection (collectively called "experience")
before bandying about lists of personal gripes and reasons why Python
is annoying/stupid/sucks.  At least in public.  Actually, it might be
of value to keep your own personal list, and then revisit it a month
or a year later and see if the warts are still as offending to your
sensibilities as they originally were.

Newbies, please try to work with Python as it is for a bit.  Ask
questions when the documentation is unclear to you or the results of
your efforts confound you.  But please hold of on the "reasons Python
sucks" lists.  You might find that these "deficiencies" actually
translate into strengths.  Despite its warts, Python is being used
productively by at least several dozen people around the world, so it
must be good for *something*.

-- Paul

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Re: regex question

[Duncan Booth]

proctor <[EMAIL PROTECTED]> wrote:

>> >>> re.findall('(.)*', 'abc')
>> ['c', '']

> thank you this is interesting.  in the second example, where does the
> 'nothingness' match, at the end?  why does the regex 'run again' when
> it has already matched everything?  and if it reports an empty match
> along with a non-empty match, why only the two?
> 

There are 4 possible starting points for a regular expression to match in a 
three character string. The regular expression would match at any starting 
point so in theory you could find 4 possible matches in the string. In this 
case they would be 'abc', 'bc', 'c', ''.

However findall won't get any overlapping matches, so there are only two 
possible matches and it returns both of them: 'abc' and '' (or rather it 
returns the matching group within the match so you only see the 'c' 
although it matched 'abc'.

If you use a regex which doesn't match an empty string (e.g. '/x(.*?)x/' 
then you won't get the empty match.
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Re: Access to raw command line?

[Pieter Edelman]

Of course you're right about that. I think an optional GUI or wizard-
like interface (in this particular case) would be best, but I was
looking for an easy fix :) Thanks for the suggestion though.

On Apr 26, 5:25 pm, Michele Simionato <[EMAIL PROTECTED]>
wrote:
> On Apr 26, 9:04 am, Pieter Edelman <[EMAIL PROTECTED]> wrote:
>
> > Hi,
>
> > I'm currently writing a command-line program in Python, which takes
> > commands in the form of:
> > ./myprog.py [OPTIONS] ARGS
>
> Once you start having too many arguments and options on the command
> line, you might
> consider using the cmd module of the standard library instead. Then
> you could implement your own
> expansion, and you would have portability for non-Unix system too.
>
>   Michele Simionato


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use urllib library to have an upload status bar

[shirish]

Hi all,
 Before I start, please know that I'm no developer, just a user.
This is also a cross-post as I have tried to post the same at python-
bugs mailing list, just don't know if it gets in or not.

 We have a bug-reporting system in ubuntu called apport. Apparently
apport uses a python library called urllib. As of now, apport does a
bouncing bar while uploading which doesn't give the user idea as to
how much is being uploaded. Refer 
https://bugs.launchpad.net/ubuntu/+source/apport/+bug/91521
. I did try to see if this issue has been addressed or not but came
nowhere. It would be nice to know if there are some solutions, or is
there a roadmap where this feature would be integrated in the library.
Looking forward to suggestions, additions, flames & constructive
criticism of the same. Keep up the good work. Cheers!

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Re: regex question

[proctor]

On Apr 27, 8:50 am, Paul McGuire <[EMAIL PROTECTED]> wrote:
> On Apr 27, 9:10 am, proctor <[EMAIL PROTECTED]> wrote:
>
>
>
> > On Apr 27, 1:33 am, Paul McGuire <[EMAIL PROTECTED]> wrote:
>
> > > On Apr 27, 1:33 am, proctor <[EMAIL PROTECTED]> wrote:
>
> > > > hello,
>
> > > > i have a regex:  rx_test = re.compile('/x([^x])*x/')
>
> > > > which is part of this test program:
>
> > > > 
>
> > > > import re
>
> > > > rx_test = re.compile('/x([^x])*x/')
>
> > > > s = '/xabcx/'
>
> > > > if rx_test.findall(s):
> > > > print rx_test.findall(s)
>
> > > > 
>
> > > > i expect the output to be ['abc'] however it gives me only the last
> > > > single character in the group: ['c']
>
> > > > C:\test>python retest.py
> > > > ['c']
>
> > > > can anyone point out why this is occurring?  i can capture the entire
> > > > group by doing this:
>
> > > > rx_test = re.compile('/x([^x]+)*x/')
> > > > but why isn't the 'star' grabbing the whole group?  and why isn't each
> > > > letter 'a', 'b', and 'c' present, either individually, or as a group
> > > > (group is expected)?
>
> > > > any clarification is appreciated!
>
> > > > sincerely,
> > > > proctor
>
> > > As Josiah already pointed out, the * needs to be inside the grouping
> > > parens.
>
> > > Since re's do lookahead/backtracking, you can also write:
>
> > > rx_test = re.compile('/x(.*?)x/')
>
> > > The '?' is there to make sure the .* repetition stops at the first
> > > occurrence of x/.
>
> > > -- Paul
>
> > i am working through an example from the oreilly book mastering
> > regular expressions (2nd edition) by jeffrey friedl.  my post was a
> > snippet from a regex to match C comments.   every 'x' in the regex
> > represents a 'star' in actual usage, so that backslash escaping is not
> > needed in the example (on page 275).  it looks like this:
>
> > ===
>
> > /x([^x]|x+[^/x])*x+/
>
> > it is supposed to match '/x', the opening delimiter, then
>
> > (
> > either anything that is 'not x',
>
> > or,
>
> > 'x' one or more times, 'not followed by a slash or an x'
> > ) any number of times (the 'star')
>
> > followed finally by the closing delimiter.
>
> > ===
>
> > this does not seem to work in python the way i understand it should
> > from the book, and i simplified the example in my first post to
> > concentrate on just one part of the alternation that i felt was not
> > acting as expected.
>
> > so my question remains, why doesn't the star quantifier seem to grab
> > all the data.  isn't findall() intended to return all matches?  i
> > would expect either 'abc' or 'a', 'b', 'c' or at least just
> > 'a' (because that would be the first match).  why does it give only
> > one letter, and at that, the /last/ letter in the sequence??
>
> > thanks again for replying!
>
> > sincerely,
> > proctor- Hide quoted text -
>
> > - Show quoted text -
>
> Again, I'll repeat some earlier advice:  you need to move the '*'
> inside the parens - you are still leaving it outside.  Also, get in
> the habit of using raw literal notation (that is r"slkjdfljf" instead
> of "lsjdlfkjs") when defining re strings - you don't have backslash
> issues yet, but you will as soon as you start putting real '*'
> characters in your expression.
>
> However, when I test this,
>
> restr = r'/x(([^x]|x+[^/])*)x+/'
> re_ = re.compile(restr)
> print re_.findall("/xabxxcx/ /x123xxx/")
>
> findall now starts to give a tuple for each "comment",
>
> [('abxxc', 'xxc'), ('123xx', 'xx')]
>
> so you have gone beyond my limited re skill, and will need help from
> someone else.
>
> But I suggest you add some tests with multiple consecutive 'x'
> characters in the middle of your comment, and multiple consecutive 'x'
> characters before the trailing comment.  In fact, from my
> recollections of trying to implement this type of comment recognizer
> by hand a long time ago in a job far, far away, test with both even
> and odd numbers of 'x' characters.
>
> -- Paul

thanks paul,

the reason the regex now give tuples is that there are now 2 groups,
the inner and outer parens.  so group 1 matches with the star, and
group 2 matches without the star.

sincerely,
proctor

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editing scripts on a mac

[Steve Holden]

I am teaching someone Python by email, and part of our conversation 
recently ran as follows:

him> How do I save a script and run it?

me > Do you have a text editor? If so, edit the script in that, then 
save it
me > in your home directory (the place you can see when you open the 
terminal

him> I do not have a text editor, but here are the answers to
him> questions 1-5.

Now, frankly, I don't think this answer is correct, since I know OS X is 
a UNIX derivative, but I am loathe to involve a programming noob with vi 
or something similar. So I wondered if one of the c.l.py mac users could 
give brief instructions for firing up a visual text editor of some sort 
and saving a file somewhere it can easily be accessed from a terminal 
window (which I presume starts up in his home directory).

regards
  Steve
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Skype: holdenweb http://del.icio.us/steve.holden
Recent Ramblings   http://holdenweb.blogspot.com

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Re: My newbie annoyances so far

[John Nagle]

Paul McGuire wrote:
> Python is not VB and Python is not Java and Python is not Ruby and
> Python is not any other language that is not Python.

 As someone who's written in too many programming languages over
a long career, I'm quite pleased with Python as a programming
language.  It's straightforward to write, has few irregularities,
and has good run-time error semantics.

 The weak points in Python are implementation issues.
Sockets, HTTP access, SSL, and database access are all
flakier than they should be for such common capabilities.
The CPython implementation is unreasonably slow compared
to good implementations of other dynamic languages such
as LISP and JavaScript.

 But really, the language is in good shape.  I'd rather
have a faster implementation of Python 2.5 than anything
being proposed as a language change.

John Nagle

(P.S. PEP 3117 is a joke, right?)
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Learning to use wxPython

[KDawg44]

Hi,

I downloaded the wxPython demo and did an emerge wxpython (gentoo) to
install.  When I run the demo, I am getting this error:


# python demo.py
Traceback (most recent call last):
  File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/
_misc.py", line 1286, in Notify
self.notify()
  File "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/
_core.py", line 13637, in Notify
self.result = self.callable(*self.args, **self.kwargs)
  File "/root/wxPython Demo/wxPython-2.8.3.0/demo/Main.py", line 1798,
in ShowMain
frame = wxPythonDemo(None, "wxPython: (A Demonstration)")
  File "/root/wxPython Demo/wxPython-2.8.3.0/demo/Main.py", line 1275,
in __init__
self.filter = wx.SearchCtrl(leftPanel)
AttributeError: 'module' object has no attribute 'SearchCtrl'

What am I doing wrong?

Thanks.

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Re: Accessing SQL View with Python

[kyosohma]

On Apr 27, 10:29 am, Tim Golden <[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] wrote:
> > Hi All,
>
> > I need to access a Microsoft SQL database View. Is there a way to do
> > this with Python? I have done a fair share of "googling" and found
> > nothing on accessing Views, just executing SQL, which I already know
> > how to do.
>
> > I am running Windows XP, Python 2.4.
>
> Absolutely loads of ways. But (unless I'm missing
> something here) they all involve executing SQL
> which accesses a View (such as: SELECT * FROM v_info).
> Have I missed the point of your question?
>
> TJG

I figured there was. And yes, I knew you'd need to use SQL to get at
the View. I just re-ran it and discovered that I am quite good at
typos. I corrected the SQL and it seems to be working now.

Thanks for the help.

Mike

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Re: Learning to use wxPython

[Michele Petrazzo]

KDawg44 wrote:
> Hi,
> 
Hi,

> I downloaded the wxPython demo and did an emerge wxpython (gentoo) to
>  install.  When I run the demo, I am getting this error:
> 
> 
> # python demo.py Traceback (most recent call last): File
> "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/ _misc.py",
> line 1286, in Notify

 From here, I read that you are using the wx version 2.6 and the demo
that you are tring are for the 2.8.3! (the last as now).
So:
1) install the new 2.8
2) download the demo for the 2.6! :)

Bye,
Michele
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Re: editing scripts on a mac

[Tommy Grav]

> him> I do not have a text editor, but here are the answers to
> him> questions 1-5.
>
> Now, frankly, I don't think this answer is correct, since I know OS  
> X is
> a UNIX derivative, but I am loathe to involve a programming noob  
> with vi
> or something similar. So I wondered if one of the c.l.py mac users  
> could
> give brief instructions for firing up a visual text editor of some  
> sort
> and saving a file somewhere it can easily be accessed from a terminal
> window (which I presume starts up in his home directory).

I think emacs is bundled with OS X and can be started in a terminal
window with emacs. If you want a non-terminal editor Aquaemacs
(http://aquamacs.org/) is available and easily installed on mac.

Cheers
 Tommy



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Re: My newbie annoyances so far

[Michael Hoffman]

John Nagle wrote:

> (P.S. PEP 3117 is a joke, right?)

Note date of creation.
-- 
Michael Hoffman
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Re: editing scripts on a mac

[Thomas Nelson]

On Apr 27, 11:37 am, Tommy Grav <[EMAIL PROTECTED]> wrote:
> > him> I do not have a text editor, but here are the answers to
> > him> questions 1-5.
>
> > Now, frankly, I don't think this answer is correct, since I know OS  
> > X is
> > a UNIX derivative, but I am loathe to involve a programming noob  
> > with vi
> > or something similar. So I wondered if one of the c.l.py mac users  
> > could
> > give brief instructions for firing up a visual text editor of some  
> > sort
> > and saving a file somewhere it can easily be accessed from a terminal
> > window (which I presume starts up in his home directory).
>

1) Open Finder, click "Applications", and open "TextEdit".
2) hit shift-apple-T, or select Format -> Make Plain Text,  to put you
in plaintext mode (It's .rtf by default)
3) Make sure you save in the home directory (usually a picture of a
house).

HTH,
Tom

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Re: editing scripts on a mac

[Tommy Nordgren]

On 27 apr 2007, at 18.08, Steve Holden wrote:

> I am teaching someone Python by email, and part of our conversation
> recently ran as follows:
>
> him> How do I save a script and run it?
>
> me > Do you have a text editor? If so, edit the script in that, then
> save it
> me > in your home directory (the place you can see when you open the
> terminal
>
> him> I do not have a text editor, but here are the answers to
> him> questions 1-5.
>
> Now, frankly, I don't think this answer is correct, since I know OS  
> X is
> a UNIX derivative, but I am loathe to involve a programming noob  
> with vi
> or something similar. So I wondered if one of the c.l.py mac users  
> could
> give brief instructions for firing up a visual text editor of some  
> sort
> and saving a file somewhere it can easily be accessed from a terminal
> window (which I presume starts up in his home directory).
>
> regards
>   Steve
Text Wrangler (www.barebones.com) and Alpha/Tk
are both excellent GUI programmers editors that run on Mac.
Alpha/Tk is open-sourced as well

--
What is a woman that you forsake her, and the hearth fire and the  
home acre,
to go with the old grey Widow Maker.  --Kipling, harp song of the  
Dane women
Tommy Nordgren
[EMAIL PROTECTED]



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Re: use urllib library to have an upload status bar

[Larry Bates]

shirish wrote:
> Hi all,
>  Before I start, please know that I'm no developer, just a user.
> This is also a cross-post as I have tried to post the same at python-
> bugs mailing list, just don't know if it gets in or not.
> 
>  We have a bug-reporting system in ubuntu called apport. Apparently
> apport uses a python library called urllib. As of now, apport does a
> bouncing bar while uploading which doesn't give the user idea as to
> how much is being uploaded. Refer 
> https://bugs.launchpad.net/ubuntu/+source/apport/+bug/91521
> . I did try to see if this issue has been addressed or not but came
> nowhere. It would be nice to know if there are some solutions, or is
> there a roadmap where this feature would be integrated in the library.
> Looking forward to suggestions, additions, flames & constructive
> criticism of the same. Keep up the good work. Cheers!
> 

the generic http browser upload doesn't give you any opportunity to
have a callback so you can update the screen with any progress.
There are some Java solutions available, but IMHO it will take a
major change to browser's http upload implementation to make this
possible.

-Larry
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Re: Correct behavior?

[Mitja Trampus]

[EMAIL PROTECTED] wrote:
> On Apr 26, 8:34 pm, asker <[EMAIL PROTECTED]> wrote:
>> But:>>> print "%15.2f" % a+b
>>
>> Traceback (most recent call last):
>>   File "", line 1, in 
>> TypeError: cannot concatenate 'str' and 'float' objects
>>
>> Is this correct for Python to issue this error?
> 
> The % operator has higher precedence than +.  Thus, "%15.2f" % a+b ==
> ("%15.2f" % a)+b, an illegal str+float addition.

Just as a warning:
If you're not expecting this behavior, you can get a pretty 
  nasty surprise if the adddition in question is str+str and 
the operation becomes legal (but semantically different):

s1 = "Captain "
s2 = "Bertorelli"
print "Ah, %s! Welcome to my humble cafe..." % s1+s2

--> "Ah, Captain ! Welcome to my humble cafe...Bertorelli"

Of course this can (and should) be avoided using 
"...%s%s..." % (s1,s2), but I know it has bitten me once.
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Re: Rational numbers

[M.-A. Lemburg]

On 2007-02-23 16:35, Martin Manns wrote:
> Hi,
> 
> I am starting to use rationals and since I found no batteries included,
> I tried out the mxNumber package.
> 
> However, I get strange warnings on comparison operations
> (which however seem to yield correct results):
> 
> ---
> $ python
> Python 2.4.3 (#1, Jan 15 2007, 15:46:19) 
> [GCC 4.1.1 (Gentoo 4.1.1-r3)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
 from mx.Number import *
 a=Rational(0,1)
 a
> 0/1
 str(a)
> '0.0'
 b=-50
 b
> -50L
 a==b
> __main__:1: RuntimeWarning: tp_compare didn't return -1, 0 or 1
> False
> ---
> 
> How do I get rid of these warnings?

FYI: The next version of mxNumber will have this warning removed.

> Is there any rational number library around that
> 1) is comparably fast for large denominators
> 2) allows deriving types from Rationals without wrapping?
> 
> Regards
> 
> Martin
> 
> P.S. The respective mailing list does not like me, so that I try my
> luck here.

Why is that ? The egenix-user mailing is open for all our users.
We do require registration to stop spam from reaching the list.

-- 
Marc-Andre Lemburg
eGenix.com

Professional Python Services directly from the Source  (#1, Apr 27 2007)
>>> Python/Zope Consulting and Support ...http://www.egenix.com/
>>> mxODBC.Zope.Database.Adapter ... http://zope.egenix.com/
>>> mxODBC, mxDateTime, mxTextTools ...http://python.egenix.com/


 Try mxODBC.Zope.DA for Windows,Linux,Solaris,MacOSX for free ! 


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D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg
   Registered at Amtsgericht Duesseldorf: HRB 46611
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Re: My newbie annoyances so far

[John Nagle]

Dennis Lee Bieber wrote:
> On 27 Apr 2007 08:34:42 -0700, Paul McGuire <[EMAIL PROTECTED]>
> declaimed the following in comp.lang.python:
> 
> 
>>deficient - ternary expressions are now part of the language after
>>years of refugees from C and C++ asking how to write "a = b ? c : d",
>>and now they'll get to puzzle/gripe over mapping this to "a = c if b
>>else d".  But as a newbie, you need to invest a little more time and
> 
> 
>   And I'll probably ignore those expressions whenever I do get around
> to 2.5+... That syntax, in my mind, just... stinks...

ALGOL used "expression IF"; you could write

x := (IF a > b THEN a ELSE b);

but that doesn't map well to an indentation-based language.

A syntax suitable for Python, now that there's a bool type, might
be to define ".if()" for "bool".  Then one could write

(a > b).if(a,b)

which is better than adding an operator.

Such things are useful in formatting expressions.

msg = 'Unit is %s' % (unitstatus.if("on","off"),)

but not really essential.

John Nagle
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Re: http pipelining

[Steve Holden]

[EMAIL PROTECTED] wrote:
> Which python module is capable of  pipelining http requests?
> 
> (I know httplib can send mulitple requests per tcp connection, but in
> a strictly serial way. )
> 
Oops, sorry, you meant sending requests in parallel, right?

You'll need to use either urllib or urllib2 for the web, and the 
threading module is one way to run parallel requests. It's fairly easy 
to use as long as you keep your tasks properly isolated form each other.

regards
  Steve
-- 
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Skype: holdenweb http://del.icio.us/steve.holden
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Re: http pipelining

[Steve Holden]

[EMAIL PROTECTED] wrote:
> Which python module is capable of  pipelining http requests?
> 
> (I know httplib can send mulitple requests per tcp connection, but in
> a strictly serial way. )
> 
> 
There's nothing in the standard library, I believe, that includes both 
client and server functionality in the same module. So you would need to 
glue them together.

If you want a simple net proxy server I seem to remember the chameleon 
system allows you to write one in about twelve lines. If it has to be 
HTTP-specific, with header parsing and the like, you might want to think 
about Twisted, which supports both client and server functionality and 
tries to make it easy to plumb things together in pipelines.

regards
  Steve
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Skype: holdenweb http://del.icio.us/steve.holden
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Re: Learning to use wxPython

[KDawg44]

On Apr 27, 11:25 am, Michele Petrazzo
<[EMAIL PROTECTED]> wrote:
> KDawg44 wrote:
> > Hi,
>
> Hi,
>
> > I downloaded the wxPython demo and did an emerge wxpython (gentoo) to
> >  install.  When I run the demo, I am getting this error:
>
> > # python demo.py Traceback (most recent call last): File
> > "/usr/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/ _misc.py",
> > line 1286, in Notify
>
>  From here, I read that you are using the wx version 2.6 and the demo
> that you are tring are for the 2.8.3! (the last as now).
> So:
> 1) install the new 2.8
> 2) download the demo for the 2.6! :)
>
> Bye,
> Michele

ahhhmy badi did not realize that.  Thanks!

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Re: http pipelining

[swq22]

On Fri, 27 Apr 2007 13:50:21 -0400, Steve Holden <[EMAIL PROTECTED]>
wrote:

>[EMAIL PROTECTED] wrote:
>> Which python module is capable of  pipelining http requests?
>> 
>> (I know httplib can send mulitple requests per tcp connection, but in
>> a strictly serial way. )
>> 
>> 
>There's nothing in the standard library, I believe, that includes both 
>client and server functionality in the same module. So you would need to 
>glue them together.
>
>If you want a simple net proxy server I seem to remember the chameleon 
>system allows you to write one in about twelve lines. If it has to be 
>HTTP-specific, with header parsing and the like, you might want to think 
>about Twisted, which supports both client and server functionality and 
>tries to make it easy to plumb things together in pipelines.

Sorry for my confused question. 

What I'm looking for is to emulate what a modern HTTP 1.1 browser like
Firefox does(when network.http.pipelining is enabled)

1.Open TCP connetion.

send multiple requests without waiting for a reply:

2.GET /url1
3.GET /url2
4.GET /url3
5.read 1st reply
6.read 2st reply
7.read 3st reply

8.Close TCP connection.

I'll be using Apache or IIS as my web server.


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wxPython (Flex)GridSizer Failing

[[EMAIL PROTECTED]]

Python v2.5
wxPython v2.8.3.0

I've got an app that has a wx.Panel managed by a FlexGridSizer.  There
are 5 columns and 6 rows, all with StaticText widgets and all of
similar size.  Everything works fine until I Clear and re-fill the
sizer a few times, then it puts all of the text in the upper-left
corner.  I can clear/refill the grid to my hearts contents but it
doesn't fix itself.  However, if I resize the main window the next
clear/refill will display correctly and _sometimes_ the current fill
will change and display correctly.

I have an identical panel directly below it (vertical box-sizer) with
the same number of columns but only 1 row and it never has a problem.
Both panels are identical because it's the same custom derived class
creating them and both are added to the box-sizer in an identical way.

I tried changing to an (un-flexible) GridSizer and got a different
display but the same problem.  If anything, it occurs sooner.

Any ideas on what is happening?

-- Brian

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Re: Access to raw command line?

[Donn Cave]

In article <[EMAIL PROTECTED]>,
 Grant Edwards <[EMAIL PROTECTED]> wrote:

> On 2007-04-26, Donn Cave <[EMAIL PROTECTED]> wrote:
> 
> >> One possible way to work around this is to get the raw command line
> >> and do the shell expansions ourselves from within Python. Ignoring the
> >> question of whether it is worth the trouble, does anybody know if it
> >> is possible to obtain the raw (unexpanded) command line?
> >
> > If you're on VMS (well, you didn't say), you're in luck.
> >
> > The UNIX shell has already expanded the file globbing by the
> > time your program starts up, but VMS leaves it to the application,
> > with the help of a handy RMS$ function or two so it gets done in
> > a consistent way.  This allows the command line interface to
> > interact with the user in a little more transparent way, since
> > the input seen by the program is congruent with what the user
> > typed in.  E.g., "rename *.jpeg *.jpg" is trivial on VMS,
> > impossible on UNIX.
> 
> Typing  rename '*.jpeg' '*.jpg' is impossible?

It is not (of course, nor is implementation impossible), but as
noted earlier in this thread it isn't idiomatic.  You can present
an interface like this to a user who has been specially trained
to use it, but no one would naturally expect it to work, without
prior instruction, so it isn't any more or less interesting than,
say, "rename *.jpeg .jpeg".   (Oops, now that I think of it, that's
what I should have said works on VMS anyway.  Been too long.)

   Donn Cave, [EMAIL PROTECTED]
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More urllib timeout issues.

[John Nagle]

   I thought I had all the timeout problems with urllib worked around,
but no.

   socket.setdefaulttimeout is useful, but not always effective.
I'm setting that to 15 seconds.
If the host end won't open the connection within 15 seconds,
urllib times out.  But if the host end opens the connection,
then never sends anything, urllib waits for many minutes before
timing out.  Any idea how to deal with this?  And don't just
say "use urllib2" unless you KNOW it works better there and
can explain why.  I finally have M2Crypto and urllib playing
well together, and don't want to mess with that.

   For some wierd reason, several UK academic sites have this
behavior, including "soton.ac.uk".  If you try to open that
in a browser, the browser just sits there, and eventually,
after several minutes, displays "The site is taking too
long to respond".

   What's the current status in this area?  Some patches to sockets
were proposed a while back.  There's a long history of trouble
in this area, and some fixes, but nothing that just works.
The sockets module has two timeout settings (socket.setdefaulttimeout and
sock.settimeout, the M2Crypto module has two (sock.set_socket_read_timeout and 
sock.set_socket_write_timeout), and none of them play well together
or with the urllib/urllib2/httplib level and the blocking/non blocking
socket distinction.

   What we really should have is something like this:

Sockets should have
set_socket_connect_timeout
set_socket_read_timeout
set_socket_write_timeout

which set an upper limit on how long a socket can go with a request for
a connect, read or write pending but without progress on the connection.
This needs to be independent of select poll timeouts, and these timeouts
should work on blocking sockets.

The existing socket function

settimeout

should set all of the above, and

socket.setdefaulttimeout

should set the default value for settimeout to be used on new sockets.

SSL and M2Crypto, which wrap socket functionality,
should understand all the above functions.

HTTPlib, urllib, and urllib2 objects should understand

settimeout

Making the connect/read/write timeout distinction at that level
probably isn't worth the trouble.

Then we'd have a reasonable network timeout system.
We have about half of the above now, but it's not consistent.

Comments?

John Nagle
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Re: : Re-ocurring Events

[Cameron Laird]

In article <[EMAIL PROTECTED]>,
Robert Rawlins - Think Blue <[EMAIL PROTECTED]> wrote:
.
.
.
>I've been thinking about the possibility of using a combination of xpath to
>search the XML with some loops which change the date. As events won't ever
.
[much other detail]
.
.
XPath's great, of course http://www-128.ibm.com/developerworks/xml/library/x-simplifyxmlreads.html >.
Among XML devotees, the first bell that rings when someone is *transforming*
XML, as you seem to need, is XSLT http://uche.ogbuji.net/tech/akara/nodes/2003-01-01/python-xslt >.

I understand your problem poorly enough, and Python is rich enough,
that perhaps the most appropriate solution involves any number of 
other technologies (XQuery?  ...).
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Re: Dedicated CPU core for Python?

[Joshua J. Kugler]

On Thursday 26 April 2007 14:07, Gabriel Genellina wrote:

> En Thu, 26 Apr 2007 15:54:38 -0300, Joshua J. Kugler
> <[EMAIL PROTECTED]> escribió:
> 
>> Are you talking about CPU affinity
>> (http://en.wikipedia.org/wiki/Processor_affinity) or an actual CPU that
>> can directory execute Python byte code?  If the former, CPython only
>> uses one
>> CPU core right now because it's threads are all internal, and do not
>> spawn system threads (IIRC).
> 
> Python threads are OS threads:
> http://docs.python.org/lib/module-thread.html
> "[The thread module] is supported on Windows, Linux, SGI IRIX, Solaris
> 2.x, as well as on systems that have a POSIX thread (a.k.a. ``pthread'')
> implementation."

Yes, that may be, but they are not true system threads, or at least do not
appear to be.  Threads on linux each show up as a separate process.  I can
have several threads in my Python program, but no additional processes show
up in ps -A.  I don't see how Python threads can be system threads with the
GIL.  But, I've been wrong before, and threads are something I have very
light knowledge of.

j

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Re: editing scripts on a mac

[Michael Bentley]

On Apr 27, 2007, at 11:08 AM, Steve Holden wrote:

> I am teaching someone Python by email, and part of our conversation
> recently ran as follows:
>
> him> How do I save a script and run it?
>
> me > Do you have a text editor? If so, edit the script in that, then
> save it
> me > in your home directory (the place you can see when you open the
> terminal
>
> him> I do not have a text editor, but here are the answers to
> him> questions 1-5.
>
> Now, frankly, I don't think this answer is correct, since I know OS  
> X is
> a UNIX derivative, but I am loathe to involve a programming noob  
> with vi
> or something similar. So I wondered if one of the c.l.py mac users  
> could
> give brief instructions for firing up a visual text editor of some  
> sort
> and saving a file somewhere it can easily be accessed from a terminal
> window (which I presume starts up in his home directory).

As Thomas mentioned, Text Edit is in the Applications folder.  And as  
Tommy mentioned, OS X does come with emacs.  The default emacs on OS  
X is terminal based (and I've never figured out what key is supposed  
to be the Meta key).  Other terminal based text editors include vi  
(of course) and nano.

The IMHO better emacs Tommy suggested: Aquamacs is *really* good, and  
unlike the non-emacs editors mentioned so far -- has syntax  
highlighting for Python (and most everything else).  But both Text  
Edit and nano are dead easy for noobs.

BTW, the Terminal application is in Applications->Utilities

hth,
Michael

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Re: Dedicated CPU core for Python?

[John Nagle]

Joshua J. Kugler wrote:
> On Thursday 26 April 2007 14:07, Gabriel Genellina wrote:
> 
> 
>>En Thu, 26 Apr 2007 15:54:38 -0300, Joshua J. Kugler
>><[EMAIL PROTECTED]> escribió:
>>
>>
>>>Are you talking about CPU affinity
>>>(http://en.wikipedia.org/wiki/Processor_affinity) or an actual CPU that
>>>can directory execute Python byte code?  If the former, CPython only
>>>uses one
>>>CPU core right now because it's threads are all internal, and do not
>>>spawn system threads (IIRC).
>>
>>Python threads are OS threads:
>>http://docs.python.org/lib/module-thread.html
>>"[The thread module] is supported on Windows, Linux, SGI IRIX, Solaris
>>2.x, as well as on systems that have a POSIX thread (a.k.a. ``pthread'')
>>implementation."
> 
> 
> Yes, that may be, but they are not true system threads, or at least do not
> appear to be.  Threads on linux each show up as a separate process.  I can
> have several threads in my Python program, but no additional processes show
> up in ps -A.  I don't see how Python threads can be system threads with the
> GIL.  But, I've been wrong before, and threads are something I have very
> light knowledge of.

 OK.  What's going on inside CPython is this:

 Each Python thread is an operating system thread, managed through
the POSIX pthreads interface.  On a system with more than one CPU,
more than one such thread can run at a time.

 But, because the CPython system isn't really reentrant, most of the
data structures have to be protected against simultaneous access by the Global
Interpreter Lock.  So, when you have multiple compute-bound threads
on multiple CPUs in Python, at any one time, no more than one of them
is executing the CPython interpreter.  The others are blocked on the
Global Interpreter Lock.

 The lock is unlocked before I/O requests and such, which allows another
thread to run while threads are blocked waiting for an I/O operation to
complete.

 That's why having multiple CPUs ("dual core" in marketing jargon)
won't improve Python performance.

 This is an implementation limitation of CPython and its libraries.
Jython and Iron Python don't have this issue.

John Nagle
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Returned mail: see transcript for details

[Mail Administrator]

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Memory addressing

[Simon Berube]

Hi,

   I have a rather simple question for which I couldn't find an
answer. I noticed how a significant number of objects in Python return
a __repr__() string along the lines of :

< Object at 0xXX>

   I find this notation quite convenient to avoid out of control
strings when using large arrays but I was wondering how you can use
the memory address for assigning a new object.

In c, one could simple have a pointer to that memory address and
voila, you have a new object you can analyze however it seems like
python is allergic to direct memory manipulation.

Hence, I was wondering what is the correct way to go about obtaining
objects returned in such a fashion? What am I going wrong or what am I
not getting?

Regards,

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Re: My newbie annoyances so far

[Paul McGuire]

On Apr 27, 12:42 pm, John Nagle <[EMAIL PROTECTED]> wrote:
> Dennis Lee Bieber wrote:
> > On 27 Apr 2007 08:34:42 -0700, Paul McGuire <[EMAIL PROTECTED]>
> > declaimed the following in comp.lang.python:
>
> >>deficient - ternary expressions are now part of the language after
> >>years of refugees from C and C++ asking how to write "a = b ? c : d",
> >>and now they'll get to puzzle/gripe over mapping this to "a = c if b
> >>else d".  But as a newbie, you need to invest a little more time and
>
> >And I'll probably ignore those expressions whenever I do get around
> > to 2.5+... That syntax, in my mind, just... stinks...
>
> ALGOL used "expression IF"; you could write
>
> x := (IF a > b THEN a ELSE b);
>
> but that doesn't map well to an indentation-based language.
>
> A syntax suitable for Python, now that there's a bool type, might
> be to define ".if()" for "bool".  Then one could write
>
> (a > b).if(a,b)
>
> which is better than adding an operator.
>
> Such things are useful in formatting expressions.
>
> msg = 'Unit is %s' % (unitstatus.if("on","off"),)
>
> but not really essential.
>
> John Nagle

I think a big part of the current syntax is that it still supports
short-circuiting.  In

x if a else y

y never has to be evaluated if condition a is true.  When calling
a.if(x,y), both x and y have to be evaluated.

-- Paul

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