Re: HTML templating tools
+1 for Jinja2. I love that shit On 2016-10-20 23:16, Adrian Petrescu wrote: On Thu, 20 Oct 2016 11:34:36 +0200, Tony van der Hoff wrote: Can anyone recommend a suitable replacement (preferably compatible with htmltmpl)? I don't think anything is going to be compatible with htmltmpl, but Jinja2 is a very widely-used, well-supported and easy-to-learn templating engine for Python: http://jinja.pocoo.org/docs/dev/ There's nothing specific to HTML about it, but that is its most common use case. -- https://mail.python.org/mailman/listinfo/python-list
numpy problem
Hi, I've got a nympy problem I can't get my head around. (numpy is new to me). I've got a 2D array with values: values = np.array( [[ 20, 38, 4, 45, 65], [ 81, 44, 38, 57, 92], [ 92, 41, 16, 77, 44], [ 53, 62, 9, 75, 12], [ 58, 2, 60, 100, 29], [ 63, 15, 48, 43, 71], [ 80, 97, 87, 64, 60], [ 16, 16, 70, 88, 80], [ 19, 1, 73, 39, 97], [ 48, 3, 27, 81, 14]]) And an array of indexes that for shows which row to keep for each column of values: keep = np.array([2, 3, 1, 9, 2]) So, the result should be an array like array([ values[2,0], values[3,1], values[1,2], values[9,3], values[2,4] ]) == np.array([92, 62, 38, 81, 44]) Can this be accomplished in a vectorized manner? Thx, Peter signature.asc Description: Message signed with OpenPGP using GPGMail -- https://mail.python.org/mailman/listinfo/python-list
Re: numpy problem
> > On 23 mei 2016, at 14:19, Peter Otten <__pete...@web.de> wrote: > > li...@onemanifest.net wrote: > >> I've got a 2D array with values: >> >> values = np.array( >> [[ 20, 38, 4, 45, 65], >> [ 81, 44, 38, 57, 92], >> [ 92, 41, 16, 77, 44], >> [ 53, 62, 9, 75, 12], >> [ 58, 2, 60, 100, 29], >> [ 63, 15, 48, 43, 71], >> [ 80, 97, 87, 64, 60], >> [ 16, 16, 70, 88, 80], >> [ 19, 1, 73, 39, 97], >> [ 48, 3, 27, 81, 14]]) >> >> And an array of indexes that for shows which row to keep for each column >> of values: >> >> keep = np.array([2, 3, 1, 9, 2]) >> >> So, the result should be an array like array([ values[2,0], values[3,1], >> values[1,2], values[9,3], values[2,4] ]) == np.array([92, 62, 38, 81, 44]) >> >> Can this be accomplished in a vectorized manner? > > How about > > values[keep].diagonal() That seems to do the trick! Thx. signature.asc Description: Message signed with OpenPGP using GPGMail -- https://mail.python.org/mailman/listinfo/python-list
seeking deeper (language theory) reason behind Python design choice
Hi, I was wondering (and have asked on StackOverflow [1] in a more elaborate way) whether there is a deeper reason to not allow assignments in lambda expressions. I'm not criticising, I'm asking in order to know ;-) The surface-reason is the distinction between assignments and statements, but why it was designed this way (with respect to lambda, not in general)? So far, no satisfying answer has come up, except for maybe to avoid a programmer accidentally typing `=` instead of `==`, which I find a bit unsatisfying as the only reason. There's a bounty on the StackOverflow question. Thanks for reading! Stefan [1] https://stackoverflow.com/questions/50090868/why-are-assignments-not-allowed-in-pythons-lambda-expressions -- http://stefan-klinger.de o/X Send plain text messages only, not exceeding 32kB./\/ \ -- https://mail.python.org/mailman/listinfo/python-list
Re: Writing my own typing monitor program for RSI sufferers...
Skip... So, so close The problem with this implementation is that it doesn't monitor usb keyboards under linux at all as far as I can tellsince no keyboard entry will show up in /proc/interrupts with a usb keyboard. I absolutely need the keyboard monitoring as well. Otherwise, your project would be the perfect starting point for me! Anyone else have an idea as to what I can use with Python to know when the keyboard is being used even when I don't have focus? Thanks SamOn 2/21/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: >> I want to write a program that will let me know after thirty minutes>> of typing that I need to take a five minute typing break. But when I>> stop typing it's smart enough to pause the 30 minute timer >> automatically. This is under the X-Window System (Linux).Take a look athttp://sourceforge.net/projects/watch/If you'd like to be added as a developer, let me know... Skip -- http://mail.python.org/mailman/listinfo/python-list
Detecting an active exception
Hello everybody - my first post! And it may be the most monumentally stupid question ever asked, but I just can't see an answer after several hours experimenting, searching and reading. It's simply this - how can a function determine whether or not it's being called in handling of an exception (ie. there is an "active" exception, and somewhere upstream on the stack there is an except: block statement)? Depending on what you read, sys.exc_info() is supposed to return (None,None,None) when there is no active exception, but it seems that it returns info about the last exception when there isn't one currently active. For example: try: a = a + 1 except: pass print sys.exc_info() produces: , , Where the traceback object identifies the offending a=a+1 line (of course). Is there another way of doing this? Note that I can't rely on using sys.exc_clear() in any solution, unfortunately. cheers - John -- http://mail.python.org/mailman/listinfo/python-list
Why this script can work?
Please help with this script:
class ShortInputException(Exception):
'''A user-defined exception class.'''
def __init__(self,length,atleast):
Exception.__init__(self)
self.length=length
self.atleast=atleast
try:
s=raw_input('Enter something --> ')
if len(s)<3:
raise ShortInputException(len(s),3)
# Other work can continue as usual here
except EOFError:
print '\nWhy did you do an EOF on me?'
except ShortInputException,x:
print 'ShortInputException: The input was of length %d, was
expecting at least %d' %(x.length,x.atleast)
else:
print 'No exception was raised.'
My questions are:
1) ShortInputException,x: what's the 'x'? where is it coming?
2) The 'if' and 'else' are not in the same indent scope,why this can work?
Thanks in advance.
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Re: Why this script can work?
Thanks for all the helps.
I'm not habitual for this usage of 'else',other languages seem don't
support this syntax.
i.g,writting the codes below by Perl would get an error:
# perl -le 'for $i (1..10){print $i} else{print "finished"}'
syntax error at -e line 1, near "}else"
Execution of -e aborted due to compilation errors.
2007/1/19, Diez B. Roggisch <[EMAIL PROTECTED]>:
> Jm lists wrote:
>
> > Please help with this script:
> >
> > class ShortInputException(Exception):
> > '''A user-defined exception class.'''
> > def __init__(self,length,atleast):
> > Exception.__init__(self)
> > self.length=length
> > self.atleast=atleast
> >
> > try:
> > s=raw_input('Enter something --> ')
> > if len(s)<3:
> > raise ShortInputException(len(s),3)
> > # Other work can continue as usual here
> > except EOFError:
> > print '\nWhy did you do an EOF on me?'
> > except ShortInputException,x:
> > print 'ShortInputException: The input was of length %d, was
> > expecting at least %d' %(x.length,x.atleast)
> > else:
> > print 'No exception was raised.'
> >
> >
> > My questions are:
> >
> > 1) ShortInputException,x: what's the 'x'? where is it coming?
>
> except , :
>
> will catch an exception of the kind specified in (it might
> actually be more than one), and store the exception object in the variable
> named
>
> > 2) The 'if' and 'else' are not in the same indent scope,why this can work?
>
>
> Because additionally to if, also for and try have else-clauses. The latter
> two are only being called if the body of the control structure hasn't been
> left due to "unnatural" circumstances. See this:
>
>
>
>
> for i in xrange(10):
> pass
> else:
> print "test 1"
>
> for i in xrange(10):
> break
> else:
> print "test 2"
>
> try:
> pass
> except:
> pass
> else:
> print "test 3"
>
> try:
> raise "I know I shouldn't rais strings..."
> except:
> pass
> else:
> print "test 4"
>
>
>
> It will only print
>
> test 1
> test 3
>
>
> Diez
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>
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**argv can't work
hello members,
See my script piece below:
def testB(shift,**argv):
print "first argument is %s" %shift
print "all other arguments are:",argv
testB('mails','Jen','[EMAIL PROTECTED]','Joe','[EMAIL PROTECTED]')
It can't work at all.please help tell me the reasons.thanks.
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Re: **argv can't work
Thanks for all the kind helps!
2007/1/20, Parthan SR <[EMAIL PROTECTED]>:
>
>
> On 1/20/07, Jm lists <[EMAIL PROTECTED]> wrote:
> > hello members,
> >
> > See my script piece below:
> >
> > def testB(shift,**argv):
> > print "first argument is %s" %shift
> > print "all other arguments are:",argv
> >
> > testB('mails','Jen',' [EMAIL PROTECTED]','Joe','[EMAIL PROTECTED]')
> >
> > It can't work at all.please help tell me the reasons.thanks.
> >
> >
>
> It works for me, check this one :
>
> >>> def argtst(x, **y):
> ... print "first arument is %s" % x
> ... print "other arguments are", y
> ...
> >>> argtst(x=10,a=1,b=2,c=3)
> first arument is 10
> other arguments are {'a': 1, 'c': 3, 'b': 2}
>
>
> (!) : Do not use the name 'argv' for the second argument.
>
> --
> With Regards,
>
> TechnoFreak
>
>
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Does eval has the same features as Perl's?
Hello members,
I want to know does the "eval" in python have the same features as in
Perl (capture errors)?
For example,in perl I can wrote:
$re = eval { 1 / 0 };
Though 1/0 is a fatal error but since it's in "eval" block so the perl
interpreter doesn't get exit.
Thanks again.
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Re: Does eval has the same features as Perl's?
Thank you.I'm just learning Python and want to make something clear to me.:)
2007/1/20, Steven D'Aprano <[EMAIL PROTECTED]>:
> On Sat, 20 Jan 2007 17:30:24 +0800, Jm lists wrote:
>
> > Hello members,
> >
> > I want to know does the "eval" in python have the same features as in
> > Perl (capture errors)?
> >
> > For example,in perl I can wrote:
> >
> > $re = eval { 1 / 0 };
> >
> > Though 1/0 is a fatal error but since it's in "eval" block so the perl
> > interpreter doesn't get exit.
>
> How hard would it be to actually try it?
>
> >>> eval("1/0")
> Traceback (most recent call last):
> File "", line 1, in
> File "", line 1, in
> ZeroDivisionError: integer division or modulo by zero
>
> It took about three seconds to actually test it.
>
> eval has many security risks -- as a rule, you should never pass strings
> you've got from the user to eval, unless you want the user to p0wn your
> computer. It is harder than you might think to make eval safe -- you
> should seriously consider it an advanced tool, not a basic tool. As a
> newbie, you should work under the following rule:
>
> "If I think I need to use eval, I'm probably wrong."
>
> I've been using Python for seven or eight years, and I don't think I've
> ever used eval in serious code.
>
> Now, suppose you find yourself wanting to use eval. You've considered the
> above rule carefully, and decided that it doesn't apply in this case.
> You've been careful to use it only on safe strings, not arbitrary strings
> from users. How do you use eval so it captures errors?
>
> try:
> eval("1/0")
> except ZeroDivisionError: # capture only one error
> pass
>
>
> or something like this:
>
> try:
> eval("something or other goes here")
> except Exception: # capture any error
> pass
>
>
>
> --
> Steven.
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
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About getattr()
Hello, Since I can write the statement like: >>> print os.path.isdir.__doc__ Test whether a path is a directory Why do I still need the getattr() func as below? >>> print getattr(os.path,"isdir").__doc__ Test whether a path is a directory Thanks! -- http://mail.python.org/mailman/listinfo/python-list
MySQL posting confirmation for python-list@python.org
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Exercises for dive into python
Have been working through Dive Into Python which is excellent. My only problem is that there are not exercises. I find exercises are a great way of helping stuff sink in and verifying my learning. Has anyone done such a thing? Ben -- http://mail.python.org/mailman/listinfo/python-list
Re: Exercises for dive into python
On Mon, 2006-07-24 at 16:39 +, Tal Einat wrote: > Ben Edwards (lists videonetwork.org> writes: > > > > > Have been working through Dive Into Python which is excellent. My only > > problem is that there are not exercises. I find exercises are a great > > way of helping stuff sink in and verifying my learning. Has anyone done > > such a thing? > > > > Ben > > > > > I recently gave a Python crash-course in my company, and ran into the same > problem. There are many good Python tutorials, manuals, references etc., most > are accompannied by various code examples, but there are very few exercises. I > had a hard time collecting and inventing a few good exercises, about 12 in > all. > > There are probably some good exercises out there, but they seem to be > relatviely > hard to find. Maybe they should be collected and organized at Python.org? That sounds like an exelent idea. Maybe the way to structure it is my book/chapter. > > I think building a large collection of good Python exercises could help both > those teaching Python and those learning it. Also, gathering a set of Python > exercises for those learning general programming concepts (variables, > functions, > object-oriented, etc.) could help spread the use of Python for teaching > programming. I think there is little doubt about this. The reason I liked the 'Thinking in Java' book was it had 10 exercises at the end of each chapter. I would not more onto a chapter until I had completed them all. Ben > > - Tal > -- http://mail.python.org/mailman/listinfo/python-list
Re: Exercises for dive into python
On Mon, 2006-07-24 at 23:16 +0200, Tal Einat wrote: > > snip... > > > > > > I recently gave a Python crash-course in my company, and ran > into the same > > problem. There are many good Python tutorials, manuals, > references etc., most > > are accompannied by various code examples, but there are > very few exercises. I > > had a hard time collecting and inventing a few good > exercises, about 12 in all. > > > > There are probably some good exercises out there, but they > seem to be relatviely > > hard to find. Maybe they should be collected and organized > at Python.org? > > That sounds like an exelent idea. Maybe the way to structure > it is my > book/chapter. > > You probably meant "by book/chapter". > > Well, that would be fine, but it's up to whoever wrote "dive into > Python" to update it. > I was actually suggesting a central repository for Python exercises, > all in the public domain, so that they could be used by anyone > learning or teaching Python (or programming in general). I don't think this is necessarily the case. I am fairly sure the problem is not the people writing books do not have a way of publishing the excesses, its just they have hot the time or inclination to do so. what I was suggesting was a wiki type site where exercises could be worked on collaboratively. The authors should not have a problem with this as it would add value to there work and make it more desirable. Ben > > > > > I think building a large collection of good Python exercises > could help both > > those teaching Python and those learning it. Also, gathering > a set of Python > > exercises for those learning general programming concepts > (variables, functions, > > object-oriented, etc.) could help spread the use of Python > for teaching > > programming. snip... > -- http://mail.python.org/mailman/listinfo/python-list
Possible error in 'dive into Python' book, help!
I have been going through Dive into Python which up to now has been
excellent. I am now working through Chapter 9, XML Processing. I am 9
pages in (p182) in the 'Parsing XML section. The following code is
supposed to return the whole XML document (I have put ti at the end of
this email):
from xml.dom import minidom
xmldoc =
minidom.parse('/home/ben/diveintopython-5.4/py/kgp/binary.xml')
grammerNode = xmldoc.firstChild
print grammerNode.toxml()
But it only returns:
The next line is then
grammerNode.childNodes
And it returns an empty tuples;(
Kind of stuck here as I don't really want to continue. Has anyone any
idea what is going on?
Ben
binary.xml
0
1
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Unicode question
I am using python 2.4 on Ubuntu dapper, I am working through Dive into
Python.
There are a couple of inconsictencies.
Firstly sys.setdefaultencoding('iso−8859−1') does not work, I have to do
sys.setdefaultencoding = 'iso−8859−1'
secondly the following does not give a 'UnicodeError: ASCII encoding
error:', and I would expect ti to. In fact it prints out the n with ~
above it fine:
sys.setdefaultencoding = 'ascii'
s = u'La Pe\xf1a'
print s
Any insight?
Ben
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Another problem with 'Dive Into Python'
Am going through Chapter 9 - HTTP Web Services in dive into Python. It
uses the following:
data = urllib.urlopen('http://diveintomark.org/xml/atom.xml').read()
The page no longer exists, can anyone recommend an alternative page to
use?
Ben
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SOAP/WSDL Introspection
I have the below code to get info about SOAP services at a wsdl url. It gets the in parameters OK but does not seem to get out/return parameters. Any idea why? Ben from SOAPpy import WSDL import sys wsdlfile = "http://www.xmethods.net/sd/2001/TemperatureService.wsdl"; server = WSDL.Proxy(wsdlfile) for methodName in server.methods: print "method = ", methodName callInfo = server.methods[ methodName ] for inParam in callInfo.inparams: print " inparam = ", inParam.name, inParam.type for outParam in callInfo.outparams: print " outparam = ", outParam.name, outParam.type -- http://mail.python.org/mailman/listinfo/python-list
python class instantiation
Got a question for you all...
I noticed a behaviour in python class creation that is strange, to say
the least.
When creating a class with data members but no __init__ method. Python
deals differently with data members that are muatable and immutables.
Ex:
class A(object):
stringData = "Whatever"
listData = []
instance = A()
Will have data members instantiated as expected (instance.stringData ==
"Whatever" and instance.listData == [])
instance.listData.append("SomeString")
instance.stringData = "Changed"
Now if I do
secondInstance = A()
it will come with the listData containing the SomeString appended to the
instance...
this is clearly not normal
Especially that the stringData of Second instance contains the
"Whatever" text. If the behaviour was at least consistant... but it is
not...
Am I coing nuts or is this by desing, if so it is very misleading...
The two instances are sharing the same list, but not the same string
... I did not declare the list to be static in any way Why does it
behave like this ?
Éric
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Re: mean ans std dev of an array?
Simplest I see is to do it manually.
If your array data is numeric compatible
mean = sum(a)/len(a)
as for the standard Deviation it depends on the nature of your data...
check out http://en.wikipedia.org/wiki/Standard_deviation for info on
that... but in all a for loop with a few calculation within should be
enough
I know no "standard" way to do this in python
Have not tested above code but it should work
Éric
SpreadTooThin wrote:
> import array
> a = array.array('f', [1,2,3])
>
> print a.mean()
> print a.std_dev()
>
> Is there a way to calculate the mean and standard deviation on array
> data?
>
> Do I need to import it into a Numeric Array to do this?
>
>
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