Re: MATLAB to Python?
On Nov 23, 9:43 am, Arnaud Delobelle wrote: > T0_orig is a list and you are trying to multiply this list by a float > (m**-1) Yes, yes of course. Thanks! :) This works: ---8<---8<---8<--- T0_orig = [5, 50, 500, 5000] for counter in T0_orig: T0 = (L**2)/(D*pi**2)*counter amax = T0/kappa alpha = (10**-6)*amax lambda_, xx, f = nonhomog_solver(kappa, alpha, nu, nx) V0 = sqrt( counter*(m**-1) + pi**2 * D/(m*L**2)*lambda_ ) print "V0 = ", V0 print "" ---8<---8<---8<--- -- http://mail.python.org/mailman/listinfo/python-list
Re: MATLAB to Python?
MATLABdude writes: > On Nov 22, 11:11 am, Peter Otten <__pete...@web.de> wrote: >> Try numpy.arange() instead: >> >>> numpy.arange(0, 1, .1) >> array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]) > > Thanks! It worked. > > What's wrong with the following code? > ---8<---8<---8<--- > T0_orig = [5, 50, 500, 5000] > for counter in T0_orig: > T0 = (L**2)/(D*pi**2)*counter > amax = T0/kappa > alpha = (10**-6)*amax > lambda_, xx, f = nonhomog_solver(kappa, alpha, nu, nx) > V0 = sqrt( T0_orig*(m**-1) + pi**2 * D/(m*L**2)*lambda_ ) > print "V0 = ", V0 > print "" > ---8<---8<---8<--- > > Python says: > ---8<---8<---8<--- > Traceback (most recent call last): > File "nonhomog.py", line 159, in > main() > File "nonhomog.py", line 157, in main > nonhomog(0.2) > File "nonhomog.py", line 152, in nonhomog > V0 = sqrt( T0_orig*(m**-1) + pi**2 * D/(m*L**2)*lambda_ ) > TypeError: can't multiply sequence by non-int of type 'float' > ---8<---8<---8<--- T0_orig is a list and you are trying to multiply this list by a float (m**-1) -- Arnaud -- http://mail.python.org/mailman/listinfo/python-list
Re: MATLAB to Python?
On Nov 22, 11:11 am, Peter Otten <__pete...@web.de> wrote: > Try numpy.arange() instead: > >>> numpy.arange(0, 1, .1) > array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]) Thanks! It worked. What's wrong with the following code? ---8<---8<---8<--- T0_orig = [5, 50, 500, 5000] for counter in T0_orig: T0 = (L**2)/(D*pi**2)*counter amax = T0/kappa alpha = (10**-6)*amax lambda_, xx, f = nonhomog_solver(kappa, alpha, nu, nx) V0 = sqrt( T0_orig*(m**-1) + pi**2 * D/(m*L**2)*lambda_ ) print "V0 = ", V0 print "" ---8<---8<---8<--- Python says: ---8<---8<---8<--- Traceback (most recent call last): File "nonhomog.py", line 159, in main() File "nonhomog.py", line 157, in main nonhomog(0.2) File "nonhomog.py", line 152, in nonhomog V0 = sqrt( T0_orig*(m**-1) + pi**2 * D/(m*L**2)*lambda_ ) TypeError: can't multiply sequence by non-int of type 'float' ---8<---8<---8<--- -- http://mail.python.org/mailman/listinfo/python-list
Re: CGI FieldStorage instances?
Let me rephrase the question. Say I have a query string like this: ?view=Data&item=9875 What I want to do is simply invoke process "view" with variable "Data". This would replace my existing query string mess which looks like this: if 'view' in form and 'item' in form: HTML=view(Data, item(9875)) so it just seems like it would be easier to encode the process in the query rather than filtering the query string. -- Gnarlie -- http://mail.python.org/mailman/listinfo/python-list
Re: bug? mmap doesn't like 0-length files
On Mon, 22 Nov 2010 20:33:08 -0500, Neal Becker wrote: > I don't see anything in linux man-page about the underlying C mmap function > not accepting 0-length files. My mmap(2) manpage says: ERRORS ... EINVAL (since Linux 2.6.12) length was 0. -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading bz2 file into numpy array
On Mon, 22 Nov 2010 11:37:22 +0100, Peter Otten wrote: >> is there a convenient way to read bz2 files into a numpy array? > > Try > f = bz2.BZ2File(filename) > data = numpy.fromstring(f.read(), numpy.float32) That's going to hurt if the file is large. You might be better off either extracting to a temporary file, or creating a pipe with numpy.fromfile() reading the pipe and either a thread or subprocess decompressing the data into the pipe. E.g.: import os import threading class Pipe(threading.Thread): def __init__(self, f, blocksize = 65536): super(Pipe, self).__init__() self.f = f self.blocksize = blocksize rd, wr = os.pipe() self.rd = rd self.wr = wr self.daemon = True self.start() def run(self): while True: s = self.f.read(self.blocksize) if not s: break os.write(self.wr, s) os.close(self.wr) def make_real(f): return os.fdopen(Pipe(f).rd, 'rb') Given the number of situations where you need a "real" (OS-level) file handle or descriptor rather than a Python "file-like object", something like this should really be part of the standard library. -- http://mail.python.org/mailman/listinfo/python-list
Re: bug? mmap doesn't like 0-length files
On 23Nov2010 13:59, I wrote: | On 22Nov2010 20:33, Neal Becker wrote: | | mmap.mmap (f.fileno(), 0, prot=mmap.PROT_READ) | | error: [Errno 22] Invalid argument [...] | | I don't see anything in linux man-page about the underlying C mmap function | | not accepting 0-length files. It's worth noting that any time you get an errno error/exception then it is almost certainly the underlying OS interface that has rejected your request, not the python library. Cheers, -- Cameron Simpson DoD#743 http://www.cskk.ezoshosting.com/cs/ Don't have awk? Use this simple sh emulation: #!/bin/sh echo 'Awk bailing out!' >&2 exit 2 - Tom Horsley -- http://mail.python.org/mailman/listinfo/python-list
Re: bug? mmap doesn't like 0-length files
On 22Nov2010 20:33, Neal Becker wrote: | mmap.mmap (f.fileno(), 0, prot=mmap.PROT_READ) | error: [Errno 22] Invalid argument | | According to http://docs.python.org/library/mmap.html, mmap on _windows_ | doesn't accept 0-length file. But this was tested on linux. Is this a bug? | | I don't see anything in linux man-page about the underlying C mmap function | not accepting 0-length files. On a local Gentoo Linux box mmap(2) says in the ERRORS section: EINVAL We don't like addr, length, or offset (e.g., they are too large, or not aligned on a page boundary). EINVAL (since Linux 2.6.12) length was 0. EINVAL flags contained neither MAP_PRIVATE or MAP_SHARED, or contained both of these values. Sure looks like a length of 0 is disliked. Cheers, -- Cameron Simpson DoD#743 http://www.cskk.ezoshosting.com/cs/ Carpe Daemon - Seize the Background Process - Paul Tomblin -- http://mail.python.org/mailman/listinfo/python-list
Re: Round Trip: C to Python to C Module
On Nov 19, 11:05 am, Eric Frederich wrote:
> I have a proprietary software PropSoft that I need to extend.
> They support extensions written in C that can link against PropLib to
> interact with the system.
>
> I have a Python C module that wraps a couple PropLib functions that I
> call PyProp.>From an interactive Python shell I can import PyProp and call a
> function.
>
> None of these functions really do anything outside the context of
> being logged into the PropSoft software; so all the functions fail
> when running from Python alone.
>
> To my amazement, I was able to run PyRun_SimpleString("import
> PyProp\nPyProp.some_function()") without setting PYTHONPATH or
> anything. How this works, I don't know and I don't really care (at
> the moment anyway).
>
> The problem I'm having now is how do I return things from my Python
> script back to C?
> Ultimately I won't be hard coding python inside of PyRun_SimpleString
> but loading the script from a file.
> So, how do I return values back to C? Python functions return values
> but running a python script?... doesn't that just have an exit status?
> Is there a mechanism for doing this?
>
> Thanks in advance,
> ~Eric
If you find you can't make this work as planned, you might want to
check out the SIMPL toolkit (http://www.icanprogram.com/06py/lesson1/
lesson1.html) for an alternative way to connect C programs to Python
modules.
bob
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Re: File Reading In Mac
In article <66e4164c-e81d-4a65-b847-c5ef900fa...@a37g2000yqi.googlegroups.com>, dilip raghavan wrote: > I have been trying to read contents from a file in MAC. > I wrote the code > > filename = "test.rtf" > FileHandle = open(filename,'r') > > fileStr = FileHandle.read() > print fileStr > FileHandle.close() > > When I see the output I see a lot of junk. The junk is like a lot of > question marks, the font information and other details of the file. > The actual content is lost in the junk. > > I have tried other methods like readline but still I see the junk. > I tried the asme code in windows and it worked correctly. > Can any one tell me the reason and the solution for this. With an extension of "rtf", the file is presumably a "Rich Text Format" file. http://en.wikipedia.org/wiki/Rich_Text_Format There are some Python packages out there for dealing with rtf format files. You might try rtf2xml to convert the file, preserving style attributes: http://pypi.python.org/pypi/rtf2xml/ Or look at the Mac OS X command line utility textutil (man 1 textutil) to convert the file to another format. Or use the OS X TextEdit.app. -- Ned Deily, n...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
bug? mmap doesn't like 0-length files
mmap.mmap (f.fileno(), 0, prot=mmap.PROT_READ) error: [Errno 22] Invalid argument According to http://docs.python.org/library/mmap.html, mmap on _windows_ doesn't accept 0-length file. But this was tested on linux. Is this a bug? I don't see anything in linux man-page about the underlying C mmap function not accepting 0-length files. -- http://mail.python.org/mailman/listinfo/python-list
File Reading In Mac
Hello , I have been trying to read contents from a file in MAC. I wrote the code filename = "test.rtf" FileHandle = open(filename,'r') fileStr = FileHandle.read() print fileStr FileHandle.close() When I see the output I see a lot of junk. The junk is like a lot of question marks, the font information and other details of the file. The actual content is lost in the junk. I have tried other methods like readline but still I see the junk. I tried the asme code in windows and it worked correctly. Can any one tell me the reason and the solution for this. Thanks In advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to install uTidylib, easy_install problem
On 2010-11-22, at 4:22 PM, goldtech wrote:
> I'm using activepython 2.6 on XP. I am trying to install uTidylib 0.2
> with easy_install. I like uTidylib more vs. newer modules.and want to
> use it. I get output below. How do I install it? I do see it in
> http://pypi.python.org/simple/uTidylib/
>
> Thanks.
>
> C:\Documents and Settings\user1>easy_install uTidylib
> install_dir C:\Python26\Lib\site-packages\
> Searching for uTidylib
> Reading http://pypi.python.org/simple/uTidylib/
> Reading http://utidylib.sf.net
> No local packages or download links found for uTidylib
> error: Could not find suitable distribution for
> Requirement.parse('uTidylib')
You could try using the Windows installer (uTidylib-0.2.1.win32.exe) from:
http://developer.berlios.de/project/showfiles.php?group_id=1810
And perhaps also let Cory Dodt know that his 6-year old package entry has
broken download link in it
http://pypi.python.org/pypi/uTidylib/
There is not even a source release for 0.2.1. I'd be more than happy to make
this available in PyPM
Re: Glob in python which supports the ** wildcard
Am 22.11.2010 22:43, schrieb Martin Lundberg: > Hi, > > I want to be able to let the user enter paths like this: > > apps/name/**/*.js > > and then find all the matching files in apps/name and all its > subdirectories. However I found out that Python's glob function > doesn't support the recursive ** wildcard. Is there any 3rd party glob > function which do support **? mercurial.match supports apps/name/**.js (IIUC). mglob supports rec:*.js. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
How to install uTidylib, easy_install problem
I'm using activepython 2.6 on XP. I am trying to install uTidylib 0.2
with easy_install. I like uTidylib more vs. newer modules.and want to
use it. I get output below. How do I install it? I do see it in
http://pypi.python.org/simple/uTidylib/
Thanks.
C:\Documents and Settings\user1>easy_install uTidylib
install_dir C:\Python26\Lib\site-packages\
Searching for uTidylib
Reading http://pypi.python.org/simple/uTidylib/
Reading http://utidylib.sf.net
No local packages or download links found for uTidylib
error: Could not find suitable distribution for
Requirement.parse('uTidylib')
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Re: Need advices regarding the strings (str, unicode, coding) used as interface for an external library.
On 11/22/2010 3:25 PM, jmfauth wrote: I'm planning to build an external lib. This lib will exchange a lot of strings between the lib and the "core Python code" of applications. Are you planning to exchange indirectly via disk files or directly via memory buffers? This pretty much amounts to whether the library will interface with Python-only or with anything. Also, what OSes? If 'all', you need to be able to work with both 2 and 4 byte unicodes. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Glob in python which supports the ** wildcard
Hi, Am 22.11.2010 um 23:05 schrieb Stefan Sonnenberg-Carstens: > Am 22.11.2010 22:43, schrieb Martin Lundberg: >> I want to be able to let the user enter paths like this: >> apps/name/**/*.js >> and then find all the matching files in apps/name and all its >> subdirectories. However I found out that Python's glob function >> doesn't support the recursive ** wildcard. Is there any 3rd party glob >> function which do support **? > os.walk() or os.path.walk() can be used. > You need to traverse the file system. > AFAIK there is no support for this. If you are a lucky Unix/Linux/MacOS user: --- #!/usr/bin/env python # find files import os cmd = 'find apps/name/ -type f -name "*.js" -print' # find is a standard Unix tool for filename in os.popen(cmd).readlines(): # run find command # do something with filename --- find is very powerful, really. Have anice day -- kurt.alfred.muel...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
Re: Glob in python which supports the ** wildcard
HI,
Am 22.11.2010 um 23:05 schrieb Stefan Sonnenberg-Carstens:
> Am 22.11.2010 22:43, schrieb Martin Lundberg;
>>
>> I want to be able to let the user enter paths like this:
>> apps/name/**/*.js
>> and then find all the matching files in apps/name and all its
>> subdirectories. However I found out that Python's glob function
>> doesn't support the recursive ** wildcard. Is there any 3rd party glob
>> function which do support **?
>>
> os.walk() or os.path.walk() can be used.
> You need to traverse the file system.
> AFAIK there is no support for this.
Or python only:
--
#!/usr/bin/env python
import os, fnmatch
# generator:
def find_files(directory, pattern):
for root, dirs, files in os.walk(directory):
for basename in files:
if fnmatch.fnmatch(basename, pattern):
filename = os.path.join(root, basename)
yield filename
# process each file as it is found:
for filename in find_files('apps/name', '*.js'):
print 'found java source:', filename
--
Found at
http://stackoverflow.com/questions/2186525/use-a-glob-to-find-files-recursively-in-python
Have a nice day
--
kurt.alfred.muel...@gmail.com
--
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Re: Scheme as a virtual machine?
On 2010-11-22 11:25:34 -0500, scattered said: And you don't think that [JH] could write a book about Haskell if he honestly came to think that it were a superior all-aroung language? Until he actually does, he has a financial interest in trash-talking Haskell. This makes anything he says about Haskell suspect. The fact that he *didn't* mindlessly reject [musical note lang] in favor of [Irish Ship Of The Desert] when [musical note lang] came out (despite the fact that at the time his company was deeply (exclusively?) invested in [Irish Ship Of The Desert] and arguably had a vested interest in having [musical note lang] fail to gain support) suggests that he is able to fairly evaluate the merits of other languages. No, it suggests that he saw that supporting the Irish Ship Of The Desert meant going up against Microsoft, so he jumped to the MS supported variant of the Donut Dromedary. You miss the fundamental point; having a financial interest in the outcome of a debate makes anything that person says an advertisement for his financial interests, not a fair assessment. Doubtless he has biases, but there is no reason to think that they are any greater than the bias of any programmer who has invested substantial amounts of time in becoming fluent in a particular language. Just the opposite. A person who makes his living by being paid to program in a language he has developed some expertise in (rather than selling books on it and training for it) has no financial interest in seeing others develop expertise in it - they would just represent competition. By contrast, one who sells training and books for a language profits directly when others take an interest in that language. Their financial interests are in fact opposite. JH profits when people take an interest in languages he sells training for; a working lisp programmer sees additional *competition* when someone else develops expertise in common lisp. But an advocate isn't a judge. Nobody is handing down binding decisions here - they are just advocating their positions. Now you're arguing our point; JH is an *advocate* with a clear conflict of interest which prevents him from presenting anything but the most one sided, and therefore largely useless, assessment. His writing should be seen as a paid advertisement, not as a fair treatment of programming languages. warmest regards, Ralph -- Raffael Cavallaro -- http://mail.python.org/mailman/listinfo/python-list
Re: Glob in python which supports the ** wildcard
Am 22.11.2010 22:43, schrieb Martin Lundberg: Hi, I want to be able to let the user enter paths like this: apps/name/**/*.js and then find all the matching files in apps/name and all its subdirectories. However I found out that Python's glob function doesn't support the recursive ** wildcard. Is there any 3rd party glob function which do support **? Regards, Martin Lundberg os.walk() or os.path.walk() can be used. You need to traverse the file system. AFAIK there is no support for this. <>-- http://mail.python.org/mailman/listinfo/python-list
Glob in python which supports the ** wildcard
Hi, I want to be able to let the user enter paths like this: apps/name/**/*.js and then find all the matching files in apps/name and all its subdirectories. However I found out that Python's glob function doesn't support the recursive ** wildcard. Is there any 3rd party glob function which do support **? Regards, Martin Lundberg -- http://mail.python.org/mailman/listinfo/python-list
Re: Python recursively __getattribute__
On Nov 22, 7:57 pm, Terry Reedy wrote: > On 11/22/2010 10:46 AM, Roman Dolgiy wrote: > > > Hello, > > > I need to implement such behavior: > > > obj.attr1.attr2.attr3 --> obj.attr1__attr2__attr3 > > obj.attr1.attr2.attr3 is parsed as ((obj.attr1).attr2).attr3, > so this cannot work in general but only if attr1 and attr2 are known to > not be 'final' names. > > > It looks like I have to override obj's class __getattribute__ and also > > use python descriptors somehow. > > > Any help will be much appreciated. > >http://stackoverflow.com/questions/4247036/python-recursively-getattr... > > The code posted there by THC4k depened on such knowledge, which you gave > there but not here. > > -- > Terry Jan Reedy I need to support a lot of legacy code, with THC4k's approach I'll have to modify project's existing code to use obj.attr1.val instead of obj.attr1 but this is not suitable. -- http://mail.python.org/mailman/listinfo/python-list
Need advices regarding the strings (str, unicode, coding) used as interface for an external library.
I'm planning to build an external lib. This lib will exchange a lot of strings between the lib and the "core Python code" of applications. I wish this lib to be modern, 100% unicode compliant. It will be developped for Python 2.7 and for Python 3. In an early phase, technically, it will be developed on Python 2.7 before Python 3, probably 3.2. Two options for the strings interface. a) Pure unicode, that means only type 'unicode' in Python 2.7 and only type 'str' in Python 3. Similar to the Python io module. b) Like a) plus ascii and utf-8 encoded type 'str' to keep some kind of retro compatibility. This lib will anyway work in a "unicode mode", so the ascii and the encoded utf-8 str's have to be converted into "unicode". I'm very comfortable with all this coding stuff and aware of the pros and cons of each solutions. My favourite solution is clearly on the a) side. Advices and comments are welcome. Thanks in advance. -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
Ulrich Eckhardt writes: > Let's say I have two flags invert X and invert Y. Now, for testing these, I > would write one test for each combination. What I have in the test case is > something like this: > > def test_invert_flags(self): > """test flags to invert coordinates""" > tests = [((10, 20), INVERT_NONE, (10, 20)), >((10, 20), INVERT_X, (-10, 20)), >((10, 20), INVERT_Y, (10, -20))] > for input, flags, expected in tests: > res = do_invert(input, flags) > self.assertEqual(res, expected, >"%s caused wrong results" % (flags,)) The ‘testscenarios’ library is designed for just this reason http://pypi.python.org/pypi/testscenarios/>. It takes a sequence of scenarios, each of which is a tuple just like in your example, and causes a separate test run and report for each one. -- \ “If we listen only to those who are like us, we will squander | `\ the great opportunity before us: To live together peacefully in | _o__)a world of unresolved differences.” —David Weinberger | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
Ian Kelly wrote: > On 11/22/2010 4:38 AM, Ulrich Eckhardt wrote: >> Also, I'd rather construct the error message from the data >> instead of maintaining it in different places, because >> manually keeping those in sync is another, errorprone burden. > > I'm not sure I follow the problem you're describing. If the factored > out workhorse function receives the data to test, what prevents it from > constructing an error message from that data? Sorry, unprecise description of what I want. If you define a test function and run the tests with "-v", the framework prints the first line of the docstring of that function followed by okay/fail/error, which is much friendlier to the reader than the exception dump afterwards. Using multiple very similar functions requires equally similar docstrings that repeat themselves. I'd prefer creating these from the input data. Thanks for your suggestion, Ian! Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
Re: Python recursively __getattribute__
On 11/22/2010 10:46 AM, Roman Dolgiy wrote: Hello, I need to implement such behavior: obj.attr1.attr2.attr3 --> obj.attr1__attr2__attr3 obj.attr1.attr2.attr3 is parsed as ((obj.attr1).attr2).attr3, so this cannot work in general but only if attr1 and attr2 are known to not be 'final' names. It looks like I have to override obj's class __getattribute__ and also use python descriptors somehow. Any help will be much appreciated. http://stackoverflow.com/questions/4247036/python-recursively-getattribute The code posted there by THC4k depened on such knowledge, which you gave there but not here. -- Terry Jan Reedy -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Nov 22, 12:28 pm, namekuseijin wrote: > On 22 nov, 14:47, Howard Brazee wrote: > > > On Mon, 22 Nov 2010 08:14:40 -0800 (PST), toby > > > wrote: > > >This is a good (if familiar) observation. Teaching children (or young > > >people with little exposure to computers) how to program in various > > >paradigms could produce interesting primary evidence. Pity that this > > >isn't examined widely and systematically. We could learn something > > >about how to teach programming and design languages this way, don't > > >you agree? > > > I do. > > > A study such as that would be more useful than how to teach languages > > - it could be useful in teaching other stuff as well. > > yes, pity most children are (used to be) taught Basic first. > > Also, with a study like this, it's likely some children would be > taught some lame language and others would be taught some "industrial > strength" language and still others would be taught some esoteric > language. This is not worse than the status quo, which does exactly that, but without paying attention to outcomes. What I am proposing is doing it systematically, with observation. Then we can learn something. > I'm not sure it'd prove as much as we are hoping for -- as > they are all Turing equivalent and the kids would be able to > eventually do the task asked for in any of them -- but I'm sure some > of those children would be mentally hurt for all their life. Poor > pioneers :p > > JH, nice to have you back! :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Nov 22, 8:45 am, Raffael Cavallaro wrote: > On 2010-11-22 08:12:27 -0500, markhanif...@gmail.com said: > > > All opinions are biased. > > All opinions show some bias. Not all opinions represent what is usually > called a "conflict of interest." > Maybe, but in the case of regulars on newsgroups like c.l.l, there are "conflicts of interest" that either don't or don't indirectly have to do with profiting off the popularity or perception of a particular programming language. Harrop is annoying is the same way that "MatzLisp" guy is annoying on c.l.l. > warmest regards, > > Ralph > > -- > Raffael Cavallaro -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On 22 nov, 14:47, Howard Brazee wrote: > On Mon, 22 Nov 2010 08:14:40 -0800 (PST), toby > > wrote: > >This is a good (if familiar) observation. Teaching children (or young > >people with little exposure to computers) how to program in various > >paradigms could produce interesting primary evidence. Pity that this > >isn't examined widely and systematically. We could learn something > >about how to teach programming and design languages this way, don't > >you agree? > > I do. > > A study such as that would be more useful than how to teach languages > - it could be useful in teaching other stuff as well. yes, pity most children are (used to be) taught Basic first. Also, with a study like this, it's likely some children would be taught some lame language and others would be taught some "industrial strength" language and still others would be taught some esoteric language. I'm not sure it'd prove as much as we are hoping for -- as they are all Turing equivalent and the kids would be able to eventually do the task asked for in any of them -- but I'm sure some of those children would be mentally hurt for all their life. Poor pioneers :p JH, nice to have you back! :) -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
On 11/22/2010 4:38 AM, Ulrich Eckhardt wrote: Let's say I have two flags invert X and invert Y. Now, for testing these, I would write one test for each combination. What I have in the test case is something like this: def test_invert_flags(self): """test flags to invert coordinates""" tests = [((10, 20), INVERT_NONE, (10, 20)), ((10, 20), INVERT_X, (-10, 20)), ((10, 20), INVERT_Y, (10, -20))] for input, flags, expected in tests: res = do_invert(input, flags) self.assertEqual(res, expected, "%s caused wrong results" % (flags,)) So, what I do that I test the function 'do_invert' for different input combinations and verify the result. The ugly thing is that this will abort the whole test if one of the tests in the loop fails. So, my question is how do I avoid this? I know that I could write a common test function instead: def _test_invert_flags(self, input, flags, expected): res = do_invert(input, flags) self.assertEqual(res, expected) def test_invert_flags_non(self): """test not inverting coordinates""" self._test_invert_flags((10, 20), INVERT_NONE, (10, 20)) def test_invert_flags_x(self): """test inverting X coordinates""" self._test_invert_flags((10, 20), INVERT_X, (-10, 20)) def test_invert_flags_y(self): """test inverting Y coordinates""" self._test_invert_flags((10, 20), INVERT_Y, (10, -20)) What I don't like here is that this is unnecessarily verbose and that it basically repeats information. The above code looks perfectly fine to me for testing. I think the question you should ask yourself is whether the different combinations you are testing represent tests of distinct behaviors, or tests of the same behavior on a variety of data. If the former case, as in the sample code you posted, then these should probably have separate tests anyway, so that you can easily see that both INVERT_X and INVERT_BOTH are failing, but INVERT_Y is not, which may be valuable diagnostic data. On the other hand, if your test is trying the INVERT_X behavior on nine different points, you probably don't need or want to see every individual point that fails. It's enough to know that INVERT_X is failing and to have a sample point where it fails. In that case I would say just run them in a loop and don't worry that it might exit early. Also, I'd rather construct the error message from the data instead of maintaining it in different places, because manually keeping those in sync is another, errorprone burden. I'm not sure I follow the problem you're describing. If the factored out workhorse function receives the data to test, what prevents it from constructing an error message from that data? Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
Re: Python recursively __getattribute__
On Mon, 22 Nov 2010 08:41:49 -0800 (PST) Roman Dolgiy wrote: > On Nov 22, 6:04 pm, Andreas Waldenburger > wrote: > > On Mon, 22 Nov 2010 07:46:47 -0800 (PST) Roman Dolgiy > > wrote: > > > > > Hello, > > > > > I need to implement such behavior: > > > > > obj.attr1.attr2.attr3 --> obj.attr1__attr2__attr3 > > > It looks like I have to override obj's class __getattribute__ and > > > also use python descriptors somehow. > > > > > Any help will be much appreciated. > > >http://stackoverflow.com/questions/4247036/python-recursively-getattr... > > > > Why? No, really: Why? > > > > [...] > > I have a django project. > > obj is django-haystack's SearchResult instance, it contains a lot of > de-normalized data (user__name, user__address) from django model, and > I need to access it as result.user.name for compability reasons. I don't know anything about django, so I may be babbling nonsense. Caveat emptor. How about taking your "user__whatever" thingies and have a function emit customized result instances. For this you can just create a plain object subclass, say ResultElement. If these "user__whatever" thingies are strings (you haven't told), split them by "__" and create a new plain object for every level of attributes, attaching it to the previous level. You can probably make your life easier if you use defaultdicts first and then translate these to your object hierarchy. That's how I'd do it. I don't know if that helps you. If not, please provide more info. /W -- To reach me via email, replace INVALID with the country code of my home country. But if you spam me, I'll be one sour Kraut. -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Mon, 22 Nov 2010 08:25:34 -0800, scattered wrote: > On Nov 22, 9:45 am, Raffael Cavallaro > wrote: >> On 2010-11-22 08:12:27 -0500, markhanif...@gmail.com said: >> >> > All opinions are biased. >> >> All opinions show some bias. Not all opinions represent what is usually >> called a "conflict of interest." Since JH makes his living selling >> tools and training for certain languages, he has a severe conflict of >> interest wrt asessing the value of various other languages. If these >> other languages are just as good or better than those he makes his >> living from, it would be very damaging to his livlihood for him to >> admit this fact. As a result, he is a completely unreliable source on >> the question. >> >> > And you don't think that Jon Harrop could write a book about Haskell if > he honestly came to think that it were a superior all-aroung language? Until he writes one, it is useless to speculate about what he could or could not do. There are some pretty good books on Haskell, lots of excellent resources online, and the online community is very supportive. Writing a book which adds significant value to that would not be a trivial undertaking. Best, Tamas -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Mon, 22 Nov 2010 08:14:40 -0800 (PST), toby wrote: >This is a good (if familiar) observation. Teaching children (or young >people with little exposure to computers) how to program in various >paradigms could produce interesting primary evidence. Pity that this >isn't examined widely and systematically. We could learn something >about how to teach programming and design languages this way, don't >you agree? I do. A study such as that would be more useful than how to teach languages - it could be useful in teaching other stuff as well. -- "In no part of the constitution is more wisdom to be found, than in the clause which confides the question of war or peace to the legislature, and not to the executive department." - James Madison -- http://mail.python.org/mailman/listinfo/python-list
Re: Python recursively __getattribute__
On Nov 22, 6:04 pm, Andreas Waldenburger
wrote:
> On Mon, 22 Nov 2010 07:46:47 -0800 (PST) Roman Dolgiy
> wrote:
>
> > Hello,
>
> > I need to implement such behavior:
>
> > obj.attr1.attr2.attr3 --> obj.attr1__attr2__attr3
> > It looks like I have to override obj's class __getattribute__ and also
> > use python descriptors somehow.
>
> > Any help will be much appreciated.
> >http://stackoverflow.com/questions/4247036/python-recursively-getattr...
>
> Why? No, really: Why?
>
> In that link you say that you need to do this to support legacy code. I still
> don't see how this would be necessary. If you need to support legacy code,
> doesn't that mean that the solution you're asking for already exists?
>
> I really think you should go into detail about why you need this. I'm certain
> that there's a better solution to your problem. ("Better" being one that is
> reasonably easy to implement and maintain.)
>
> /W
>
> --
> To reach me via email, replace INVALID with the country code of my home
> country. But if you spam me, I'll be one sour Kraut.
I have a django project.
obj is django-haystack's SearchResult instance, it contains a lot of
de-normalized data (user__name, user__address) from django model, and
I need to access it as result.user.name for compability reasons.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Nov 22, 9:45 am, Raffael Cavallaro wrote: > On 2010-11-22 08:12:27 -0500, markhanif...@gmail.com said: > > > All opinions are biased. > > All opinions show some bias. Not all opinions represent what is usually > called a "conflict of interest." Since JH makes his living selling > tools and training for certain languages, he has a severe conflict of > interest wrt asessing the value of various other languages. If these > other languages are just as good or better than those he makes his > living from, it would be very damaging to his livlihood for him to > admit this fact. As a result, he is a completely unreliable source on > the question. > And you don't think that Jon Harrop could write a book about Haskell if he honestly came to think that it were a superior all-aroung language? The fact that he *didn't* mindlessly reject F# in favor of O'Caml when F# came out (despite the fact that at the time his company was deeply (exclusively?) invested in O'Caml and arguably had a vested interest in having F# fail to gain support) suggests that he is able to fairly evaluate the merits of other languages. Doubtless he has biases, but there is no reason to think that they are any greater than the bias of any programmer who has invested substantial amounts of time in becoming fluent in a particular language. > This is why judges must recuse themselves from both civil and criminal > trials if they have some significant conflict of interest. But an advocate isn't a judge. Nobody is handing down binding decisions here - they are just advocating their positions. It would be better to compare JH to a defense lawyer. You can't reject the defense's arguments just because the lawyer has a vested interest in the outcome of the trial. > the law recognizes that we cannot expect a fair judgement from someone who > stands to profit significantly if the judgement goes one way or the > other. Similarly, we cannot expect a fair judgement on the relative > value of various language tools from a person whose livlihood depends > on the audience choosing only those certain language tools that he > sells services and training for. > > warmest regards, > > Ralph > > -- > Raffael Cavallaro -- http://mail.python.org/mailman/listinfo/python-list
Re: print line number and source filename
Here is what you want for printing python source filename: print __file__ > On Tuesday, June 22, 2010 12:44 PM Peng Yu wrote: > I want to print filename and line number for debugging purpose. So far > I only find how to print the line number but not how to print > filename. > > import inspect > print inspect.currentframe().f_lineno > > I found inspect.getsourcefile(), but I have to supply a class name to > it. I have searched online, but I do not find how to print the source > filename. Would you please let me know? > > Also, always importing the inspect module and getting the frame and > accessing the lineno from the frame is not very convenient to type. Is > there a shorter way to access the line number (for example, in C++ and > perl, __LINE__ can be used to access line number, which is much more > convenient than the way that I found in python). > > -- > Regards, > Peng > Submitted via EggHeadCafe > Merging SharePoint List Data into Word Documents > http://www.eggheadcafe.com/tutorials/aspnet/6054abc5-c5fb-4e86-a352-afd0e8c4a7c6/merging-sharepoint-list-data-into-word-documents.aspx -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Nov 22, 10:57 am, Howard Brazee wrote: > On Mon, 22 Nov 2010 05:38:53 +0100, Ertugrul S ylemez > wrote: > > >Haskell is a simple language with a comparably small specification. > >It's not as simple as Common Lisp, but it's simple. Note that simple > >doesn't mean easy. Haskell is certainly more difficult to learn than > >other languages, which explains the low number of success stories. On > >the other hand, I'm doing rapid web development in it. > > I wonder how much that difficulty is innate, and how much is due to > learning other languages first. This is a good (if familiar) observation. Teaching children (or young people with little exposure to computers) how to program in various paradigms could produce interesting primary evidence. Pity that this isn't examined widely and systematically. We could learn something about how to teach programming and design languages this way, don't you agree? The OLPC might do some interesting things in this area but it is still one set of tools. More interesting might be to compare outcomes across a range of different tools, paradigms, syntaxes, and teaching strategies. > I'm an old time CoBOL programmer, and know of quite a few people who > tried to learn OO-CoBOL without much luck. The way to learn it was > to forget it - learn OO with some other language, then come back to it > later. We had to divorce ourselves from the old paradigm first. > > -- > "In no part of the constitution is more wisdom to be found, > than in the clause which confides the question of war or peace > to the legislature, and not to the executive department." > > - James Madison -- http://mail.python.org/mailman/listinfo/python-list
Re: Python recursively __getattribute__
On Mon, 22 Nov 2010 07:46:47 -0800 (PST) Roman Dolgiy wrote:
> Hello,
>
> I need to implement such behavior:
>
> obj.attr1.attr2.attr3 --> obj.attr1__attr2__attr3
> It looks like I have to override obj's class __getattribute__ and also
> use python descriptors somehow.
>
> Any help will be much appreciated.
> http://stackoverflow.com/questions/4247036/python-recursively-getattribute
Why? No, really: Why?
In that link you say that you need to do this to support legacy code. I still
don't see how this would be necessary. If you need to support legacy code,
doesn't that mean that the solution you're asking for already exists?
I really think you should go into detail about why you need this. I'm certain
that there's a better solution to your problem. ("Better" being one that is
reasonably easy to implement and maintain.)
/W
--
To reach me via email, replace INVALID with the country code of my home
country. But if you spam me, I'll be one sour Kraut.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Mon, 22 Nov 2010 05:38:53 +0100, Ertugrul Söylemez wrote: >Haskell is a simple language with a comparably small specification. >It's not as simple as Common Lisp, but it's simple. Note that simple >doesn't mean easy. Haskell is certainly more difficult to learn than >other languages, which explains the low number of success stories. On >the other hand, I'm doing rapid web development in it. I wonder how much that difficulty is innate, and how much is due to learning other languages first. I'm an old time CoBOL programmer, and know of quite a few people who tried to learn OO-CoBOL without much luck. The way to learn it was to forget it - learn OO with some other language, then come back to it later.We had to divorce ourselves from the old paradigm first. -- "In no part of the constitution is more wisdom to be found, than in the clause which confides the question of war or peace to the legislature, and not to the executive department." - James Madison -- http://mail.python.org/mailman/listinfo/python-list
Python recursively __getattribute__
Hello, I need to implement such behavior: obj.attr1.attr2.attr3 --> obj.attr1__attr2__attr3 It looks like I have to override obj's class __getattribute__ and also use python descriptors somehow. Any help will be much appreciated. http://stackoverflow.com/questions/4247036/python-recursively-getattribute -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On 22 Nov 2010 06:26:34 GMT Steven D'Aprano wrote: > On Sun, 21 Nov 2010 23:57:21 -0500, Steve Holden wrote: > > > Perhaps we could take this thread to alt.small.minded.bickering now? > > Alas, my ISP doesn't carry that newsgroup. Where else can I get my > mindless off-topic bitching if not for cross-posts from > comp.lang.scheme and comp.lang.functional? > > *wink* > alt.off-topic *wink* /W -- To reach me via email, replace INVALID with the country code of my home country. But if you spam me, I'll be one sour Kraut. -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
In article , Ulrich Eckhardt wrote: > > Yet another possibility is to leave it the way you originally wrote it > > and not worry about the fact that the loop aborts on the first failure. > > Let it fail, fix it, then re-run the test to find the next failure. > > Perhaps not as efficient as finding them all at once, but you're going > > to fix them one at a time anyway, so what does it matter? > > Imagine all tests that use INVERT_X fail, all others pass. What would your > educated guess be where the code is wrong? ;) Well, let me leave you with one last thought. There's really two kinds of tests -- acceptance tests, and diagnostic tests. I tend to write acceptance tests first. The idea is that if all the tests pass, I know my code works. When some test fails, that's when I start digging deeper and writing diagnostic tests, to help me figure out what went wrong. The worst test is a test which is never written because it's too hard to write. If it's easy to write a bunch of tests which verify correct operation but don't give a lot of clues about what went wrong, it might be worth doing that first and seeing what happens. If some of the tests fail, then invest the time to write more detailed tests which give you more information about each failure. -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On 2010-11-22 08:12:27 -0500, markhanif...@gmail.com said: All opinions are biased. All opinions show some bias. Not all opinions represent what is usually called a "conflict of interest." Since JH makes his living selling tools and training for certain languages, he has a severe conflict of interest wrt asessing the value of various other languages. If these other languages are just as good or better than those he makes his living from, it would be very damaging to his livlihood for him to admit this fact. As a result, he is a completely unreliable source on the question. This is why judges must recuse themselves from both civil and criminal trials if they have some significant conflict of interest. The law recognizes that we cannot expect a fair judgement from someone who stands to profit significantly if the judgement goes one way or the other. Similarly, we cannot expect a fair judgement on the relative value of various language tools from a person whose livlihood depends on the audience choosing only those certain language tools that he sells services and training for. warmest regards, Ralph -- Raffael Cavallaro -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
Richard Thomas wrote: [batch-programming different unit tests] > You could have a parameter to the test method and some custom > TestLoader that knows what to do with it. Interesting, thanks for this suggestion, I'll look into it! Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
Roy Smith wrote: > Writing one test method per parameter combination, as you suggested, is > a reasonable approach, especially if the number of combinations is > reasonably small. The number of parameters and thus combinations are unfortunately rather large. Also, sometimes that data is not static but rather computed from a loop instead. There are a few optimised computations, where I compute the expected result with the slow but simple version, in those cases I want to check a whole range of inputs using a loop. I'm wondering, classes aren't as static as I'm still used to from C++, so creating the test functions dynamically with a loop outside the class declaration should be another possibility... > Yet another possibility is to leave it the way you originally wrote it > and not worry about the fact that the loop aborts on the first failure. > Let it fail, fix it, then re-run the test to find the next failure. > Perhaps not as efficient as finding them all at once, but you're going > to fix them one at a time anyway, so what does it matter? Imagine all tests that use INVERT_X fail, all others pass. What would your educated guess be where the code is wrong? ;) Thanks Roy! Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
Error Starting Python(Django) App using Apache+Mod_Wsgi
All, I have a problem in starting my Python(Django) App using Apache and Mod_Wsgi I am using Django 1.2.3 and Python 2.6.6 running on Apache 2.2.17 with Mod_Wsgi 3.3 When I try to access the app from Web Browser, I am getting these errors. [Mon Nov 22 09:45:25 2010] [notice] Apache/2.2.17 (Unix) mod_wsgi/3.3 Python/2.6.6 configured -- resuming normal operations [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] mod_wsgi (pid=1273874): Target WSGI script '/u01/home/apli/wm/app/gdd/pyserver/ apache/django.wsgi' cannot be loaded as Python module. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] mod_wsgi (pid=1273874): Exception occurred processing WSGI script '/u01/home/ apli/wm/app/gdd/pyserver/apache/django.wsgi'. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] Traceback (most recent call last): [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] File "/u01/ home/apli/wm/app/gdd/pyserver/apache/django.wsgi", line 19, in [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] import django.core.handlers.wsgi [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] File "/usr/ local/lib/python2.6/site-packages/django/core/handlers/wsgi.py", line 1, in [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from threading import Lock [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] File "/usr/ local/lib/python2.6/threading.py", line 13, in [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from functools import wraps [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] File "/usr/ local/lib/python2.6/functools.py", line 10, in [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from _functools import partial, reduce [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] ImportError: rtld: 0712-001 Symbol PyArg_UnpackTuple was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] rtld: 0712-001 Symbol PyCallable_Check was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] rtld: 0712-001 Symbol PyDict_Copy was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] rtld: 0712-001 Symbol PyDict_Merge was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] rtld: 0712-001 Symbol PyDict_New was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] rtld: 0712-001 Symbol PyErr_Occurred was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] rtld: 0712-001 Symbol PyErr_SetString was referenced [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] from module /usr/local/lib/python2.6/lib-dynload/_functools.so(), but a runtime definition [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] of the symbol was not found. [Mon Nov 22 09:45:43 2010] [error] [client 108.10.0.191] \t0509-021 Additional errors occurred but are not reported. I assume that those missing runtime definitions are supposed to be in the Python executable. Doing an nm on the first missing symbol reveals that it does exist. root [zibal]% nm /usr/local/bin/python | grep -i PyArg_UnpackTuple .PyArg_UnpackTuple T 268683204 524 PyArg_UnpackTupleD 537073500 PyArg_UnpackTupled 537073500 12 PyArg_UnpackTuple:F-1 - 224 Please guide. Regards, Guddu -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
In article , Ulrich Eckhardt wrote: > def test_invert_flags(self): > """test flags to invert coordinates""" > tests = [((10, 20), INVERT_NONE, (10, 20)), >((10, 20), INVERT_X, (-10, 20)), >((10, 20), INVERT_Y, (10, -20))] > for input, flags, expected in tests: > res = do_invert(input, flags) > self.assertEqual(res, expected, >"%s caused wrong results" % (flags,)) > > So, what I do that I test the function 'do_invert' for different input > combinations and verify the result. The ugly thing is that this will abort > the whole test if one of the tests in the loop fails. So, my question is > how do I avoid this? Writing one test method per parameter combination, as you suggested, is a reasonable approach, especially if the number of combinations is reasonably small. Another might be to make your loop: failCount = 0 for input, flags, expected in tests: res = do_invert(input, flags) if res != expected: print "%s caused wrong results" % (flags,) failCount += 1 self.assertEqual(failCount, 0, "%d of them failed" % failCount) Yet another possibility is to leave it the way you originally wrote it and not worry about the fact that the loop aborts on the first failure. Let it fail, fix it, then re-run the test to find the next failure. Perhaps not as efficient as finding them all at once, but you're going to fix them one at a time anyway, so what does it matter? It may also turn out that all the failures are due to a single bug, so fixing one fixes them all. -- http://mail.python.org/mailman/listinfo/python-list
Re: unittests with different parameters
On Nov 22, 11:38 am, Ulrich Eckhardt wrote: > Hi! > > I'm writing tests and I'm wondering how to achieve a few things most > elegantly with Python's unittest module. > > Let's say I have two flags invert X and invert Y. Now, for testing these, I > would write one test for each combination. What I have in the test case is > something like this: > > def test_invert_flags(self): > """test flags to invert coordinates""" > tests = [((10, 20), INVERT_NONE, (10, 20)), > ((10, 20), INVERT_X, (-10, 20)), > ((10, 20), INVERT_Y, (10, -20))] > for input, flags, expected in tests: > res = do_invert(input, flags) > self.assertEqual(res, expected, > "%s caused wrong results" % (flags,)) > > So, what I do that I test the function 'do_invert' for different input > combinations and verify the result. The ugly thing is that this will abort > the whole test if one of the tests in the loop fails. So, my question is > how do I avoid this? > > I know that I could write a common test function instead: > > def _test_invert_flags(self, input, flags, expected): > res = do_invert(input, flags) > self.assertEqual(res, expected) > > def test_invert_flags_non(self): > """test not inverting coordinates""" > self._test_invert_flags((10, 20), INVERT_NONE, (10, 20)) > > def test_invert_flags_x(self): > """test inverting X coordinates""" > self._test_invert_flags((10, 20), INVERT_X, (-10, 20)) > > def test_invert_flags_y(self): > """test inverting Y coordinates""" > self._test_invert_flags((10, 20), INVERT_Y, (10, -20)) > > What I don't like here is that this is unnecessarily verbose and that it > basically repeats information. Also, I'd rather construct the error message > from the data instead of maintaining it in different places, because > manually keeping those in sync is another, errorprone burden. > > Any suggestions? > > Uli > > -- > Domino Laser GmbH > Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 You could have a parameter to the test method and some custom TestLoader that knows what to do with it. See http://docs.python.org/library/unittest.html. I would venture that unit tests are verbose by their very nature; they are 100% redundant. The usual argument against unnecessary redundancy, that of ease of maintenance, really doesn't apply to unit tests. Anyway, good luck with your efforts. Chard. -- http://mail.python.org/mailman/listinfo/python-list
Re: Scheme as a virtual machine?
On Nov 21, 10:38 pm, Ertugrul Söylemez wrote: > "Jon Harrop" wrote: > > "Ertugrul Söylemez" wrote in message > >news:20101014052650.510e8...@tritium.streitmacht.eu... > > > > That's nonsense. > > > Actually namekuseijin is right. You really need to persevere and > > familiarize yourself with some of the other languages out > > there. Haskell is many things but simple is not one of them. If > > Haskell were half of the things you think it is, it would have more > > credible success stories. > > Jon, I don't care about your opinion, because it's biased. All opinions are biased. -- http://mail.python.org/mailman/listinfo/python-list
Re: Some syntactic sugar proposals
> if x in range(a, b): #wrong! > it feels so natural to check it that way, but we have to write > if a <= x <= b > I understand that it's not a big deal, but it would be awesome to have > some optimisations - it's clearly possible to detect things like that > "wrong" one and fix it in a bytecode. You can implement it yourself: class between(object): def __init__(self, a,b): super(crang, self).__init__() self.a=a self.b=b def __contains__(self, value): return self.a <= value <= self.b >>> 12.45 in between(-100,100) true But do you need a < x < b a <= x < b a <= x <= b or a < x <= b ? Sure, you could set a new parameter for this, but the normal way is not broken at all. Best -- http://mail.python.org/mailman/listinfo/python-list
unittests with different parameters
Hi! I'm writing tests and I'm wondering how to achieve a few things most elegantly with Python's unittest module. Let's say I have two flags invert X and invert Y. Now, for testing these, I would write one test for each combination. What I have in the test case is something like this: def test_invert_flags(self): """test flags to invert coordinates""" tests = [((10, 20), INVERT_NONE, (10, 20)), ((10, 20), INVERT_X, (-10, 20)), ((10, 20), INVERT_Y, (10, -20))] for input, flags, expected in tests: res = do_invert(input, flags) self.assertEqual(res, expected, "%s caused wrong results" % (flags,)) So, what I do that I test the function 'do_invert' for different input combinations and verify the result. The ugly thing is that this will abort the whole test if one of the tests in the loop fails. So, my question is how do I avoid this? I know that I could write a common test function instead: def _test_invert_flags(self, input, flags, expected): res = do_invert(input, flags) self.assertEqual(res, expected) def test_invert_flags_non(self): """test not inverting coordinates""" self._test_invert_flags((10, 20), INVERT_NONE, (10, 20)) def test_invert_flags_x(self): """test inverting X coordinates""" self._test_invert_flags((10, 20), INVERT_X, (-10, 20)) def test_invert_flags_y(self): """test inverting Y coordinates""" self._test_invert_flags((10, 20), INVERT_Y, (10, -20)) What I don't like here is that this is unnecessarily verbose and that it basically repeats information. Also, I'd rather construct the error message from the data instead of maintaining it in different places, because manually keeping those in sync is another, errorprone burden. Any suggestions? Uli -- Domino Laser GmbH Geschäftsführer: Thorsten Föcking, Amtsgericht Hamburg HR B62 932 -- http://mail.python.org/mailman/listinfo/python-list
Re: multiple times subprocess fails on windows
To be more specific, I have something like this in rvirtualenv itself
(that's the pokus.py file):
import os
os.system("echo 128")
I generate a batch file like this (that's the pokus.bat file):
@echo off
pokus.py
And after that, I run the pokus.bat file from a test (that's the
run.py file):
from subprocess import Popen, PIPE
p = Popen('pokus.bat', stdout=PIPE, stderr=PIPE, shell=True)
stdout, stderr = p.communicate()
print stdout.strip()
And the problem is, that I don't receive the output of the os.system
to the PIPE. Probable there is something different on windows stdout
redirection, because similar stuff works on linux..
Thanks, Jakub.
On Nov 21, 8:39 pm, kvbik wrote:
> Hello,
>
> in a test suite in my project (called rvirtualenv [1]) I discovered a
> strange behaviour when calling from python a batch file which calles
> another python and this calles a shell command.
>
> [1]http://github.com/kvbik/rvirtualenv
>
> I know it sounds pretty strange, but I do this only because I am
> testing such specific tool (that has similar functionality like
> original virtualenv and there are things like activate.bat commands).
>
> I've uploaded some code snippet here:
>
> https://gist.github.com/709004/6ccc44d6aed5fe694bb2adbef2400bbea92998a1
>
> If anyone could explain me this behaviour I would be more than happy,
> because right now it is the only failing test in my project ;).
>
> Thanks in advance, Jakub..
--
http://mail.python.org/mailman/listinfo/python-list
Accepting a SAML 2 Assertion
Hello, I am working on providing a SSO solution to a customer who acts as an identity provider. He already has IDP on his side to generate SAML 2 assertions with user first name , last name and time stamp as parameters. Our task is to accept this assertion which is signed, decrypt it and send it to the authenticator we already have. The authenticator validates the info and gives access to our application which is written using Python. Here we act as the *service provider.* I am new to SAML and have no idea how to integrate SAML to our current Python application. Can you help me on how to accept these assertion requests from the Idp and decrypt it at Service Provider end using Python. Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: building a web interface
Shel wrote: Hello, I am pretty new to all this. I have some coding experience, and am currently most comfortable with Python. I also have database design experience with MS Access, and have just created my first mySQL db. So right now I have a mySQL db structure and some Python code. My end goal is to create a browser-based interactive fiction/game thing. My code is currently just using dummy data rather than pulling in data from the db, but I think/hope it won't be too big of a deal to interact with the db through Python (famous last words...). My main problem right now is how to do the web interface. I don't know much about web architecture, unfortunately. I think I need a CGI script? What I would really like is to find a GUI tool to design the interface that would have customizable templates or drag-and-drop elements or something, so I wouldn't have to code much by hand. Something easy, if such a tool exists. Also would prefer something that I would be able to install/use without having much access to the server where the site will be hosted (on a university server that I don't have control over). I don't fully understand how a lot of the tools I have been looking at work, but it seems like they're often things where you'd have to get an administrator to do stuff on the server (is that right?), which I would prefer to avoid. It looks like Django has some sort of standalone implementation, but I'm not clear on how that would work or how much of a learning curve there would be for using it. If anyone has any thoughts or suggestions, I would really appreciate it. Hope my questions make sense. I don't really know what I'm doing, so could be they're a bit silly. I apologize if that's the case, and please let me know if you need any additional informmation. Thanks, Shel Django is quite popular, they claim to be easy to learn/use. That's for the web framework. You could use pyjamas for the web interface, looks like it works well with django. Hmm, writing python code only, sounds like a dream come true :D Note that I never used one of these, it just happened I had to look for possible solutions for a web application. JM -- http://mail.python.org/mailman/listinfo/python-list
Re: Reading bz2 file into numpy array
Johannes Korn wrote: > I tried: > > from bz2 import * > from numpy import * > fd = BZ2File(filename, 'rb') > read_data = fromfile(fd, float32) > > but BZ2File doesn't seem to produce a transparent filehandle. > is there a convenient way to read bz2 files into a numpy array? Try import numpy import bz2 filename = ... f = bz2.BZ2File(filename) data = numpy.fromstring(f.read(), numpy.float32) print data -- http://mail.python.org/mailman/listinfo/python-list
Reading bz2 file into numpy array
Hi, is there a convenient way to read bz2 files into a numpy array? I tried: from bz2 import * from numpy import * fd = BZ2File(filename, 'rb') read_data = fromfile(fd, float32) but BZ2File doesn't seem to produce a transparent filehandle. Kind regards! Johannes -- http://mail.python.org/mailman/listinfo/python-list
Re: MATLAB to Python?
MATLABdude wrote: > On Nov 17, 10:53 am, Arnaud Delobelle wrote: >> I guess that the step is supposed to be h, so you should write: >> xx = range(-kappa, kappa+1, h) > > This is what I have in the source code: > ---8<---8<---8<---8<--- > h = 0.105069988414 > xx = range(-kappa, kappa+1, h) > ---8<---8<---8<---8<--- > > This is what Python says: ValueError: range() step argument must not > be zero > > Can step not be a float value? Indeed. Older Pythons will warn you and then try to convert the arguments to integers >>> range(1.0) __main__:1: DeprecationWarning: integer argument expected, got float [0] and in 2.7 or 3.x you'll get a type error: >>> range(1.0) Traceback (most recent call last): File "", line 1, in TypeError: range() integer end argument expected, got float. Try numpy.arange() instead: >>> numpy.arange(0, 1, .1) array([ 0. , 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9]) -- http://mail.python.org/mailman/listinfo/python-list
Re: MATLAB to Python?
On Mon, Nov 22, 2010 at 12:47 AM, MATLABdude wrote: > On Nov 17, 10:53 am, Arnaud Delobelle wrote: >> I guess that the step is supposed to be h, so you should write: >> xx = range(-kappa, kappa+1, h) > > This is what I have in the source code: > ---8<---8<---8<---8<--- > h = 0.105069988414 > xx = range(-kappa, kappa+1, h) > ---8<---8<---8<---8<--- > > This is what Python says: ValueError: range() step argument must not > be zero > > Can step not be a float value? Correct. Note the DeprecationWarning which is also shown: __main__:1: DeprecationWarning: integer argument expected, got float There are too many subtleties with floating-point, so range() doesn't handle it; that way, you deal with the subtleties yourself, explicitly. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: MATLAB to Python?
On Nov 17, 10:53 am, Arnaud Delobelle wrote: > I guess that the step is supposed to be h, so you should write: > xx = range(-kappa, kappa+1, h) This is what I have in the source code: ---8<---8<---8<---8<--- h = 0.105069988414 xx = range(-kappa, kappa+1, h) ---8<---8<---8<---8<--- This is what Python says: ValueError: range() step argument must not be zero Can step not be a float value? -- http://mail.python.org/mailman/listinfo/python-list
Re: Weibull distr. random number generation
Hello Mark, Exactly, thanks very much! Dimos --- On Sat, 11/20/10, Mark Dickinson wrote: > From: Mark Dickinson > Subject: Re: Weibull distr. random number generation > To: python-list@python.org > Date: Saturday, November 20, 2010, 7:09 PM > On Nov 19, 3:21 pm, Dimos > wrote: > > I would like to use the random module, and if I > understand well the Random class, to create 1300 decimal > numbers in python, by providing the 2 Weibull parameters > (b,c). How this can be done??? > > > > import random > > print random > > random.weibullvariate(b,c) > > How can I set the population size n=1300 in decimals? > > random.weibullvariate(b, c) generates a single sample from > the > specified Weibull distribution. If you want 1300 > samples, you'd use > this within a loop. For example, here's code to put > 10 Weibull > variates with scale parameter 12345.0 and shape parameter > 6.0 into a > list: > > >>> import random > >>> samples = [] > >>> for i in xrange(10): > ... > samples.append(random.weibullvariate(12345.0, > 6.0)) > ... > >>> print samples > [15553.186762792948, 14304.175032317309, > 9015.5053691933044, > 12585.469181732506, 9436.2677219460638, 13350.89758791281, > 5687.4330250037565, 12172.747202474553, > 9687.8685933610814, > 11699.040541029028] > > A more experienced Python programmer might use a list > comprehension to > achieve the same effect in a single line: > > >>> samples = [random.weibullvariate(12345.0, 6.0) > for _ in xrange(10)] > >>> print samples > [10355.396846416865, 14689.507803932587, > 11491.850991569485, > 14128.56397290655, 12592.739991974759, 9076.7752548878998, > 11868.012238422616, 12016.784656753523, > 14724.818462506191, > 13253.477389116439] > > Is this the sort of thing you were looking for? > > -- > Mark > -- > http://mail.python.org/mailman/listinfo/python-list > -- http://mail.python.org/mailman/listinfo/python-list
