🌐 Mailman 3 August 2011 - Python-list - python.org

Calling J from Python
by Gosi March 9, 2013

March 9, 2013

It is quite easy to call J from Python http://groups.google.com/group/J-Programming/browse_thread/thread/5e84b7566…

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Re: Tk MouseWheel Support
by Greg Couch March 2, 2013

March 2, 2013

On Mar 10, 1:37 pm, Corey Richardson <kb1...(a)aim.com> wrote: > On 03/10/2011 03:35 PM, Corey Richardson wrote: > > > Middle button is Button-3 IIRC, and I think it'd be MouseUp and > > MouseDown. I'm really not sure though. > > It's Button-2 rather. > > -- > Corey Richardson Middle button is button-3 on Mac OS X, and button-2 on Linux and Windows. Very annoying, to say the least. For X11, here's a better way to inject MouseWheel events so all widgets that understand MouseWheel events will work without additional code: def mousewheel(e, delta): try: w = e.widget.focus_displayof() except AttributeError: # e.widget might be string # if not created by Tkinter (eg., menu tearoff) return if w: w.event_generate('<MouseWheel>', delta=delta, state=e.state, rootx=e.x_root, rooty=e.y_root, x=e.x, y=e.y, time=e.time) root.bind_all('<Button-4>', lambda e, mw=mousewheel: mw(e, 120)) root.bind_all('<Button-5>', lambda e, mw=mousewheel: mw(e, -120))

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toy list processing problem: collect similar terms
by Xah Lee Feb. 6, 2013

Feb. 6, 2013

here's a interesting toy list processing problem. I have a list of lists, where each sublist is labelled by a number. I need to collect together the contents of all sublists sharing the same label. So if I have the list ((0 a b) (1 c d) (2 e f) (3 g h) (1 i j) (2 k l) (4 m n) (2 o p) (4 q r) (5 s t)) where the first element of each sublist is the label, I need to produce: output: ((a b) (c d i j) (e f k l o p) (g h) (m n q r) (s t)) a Mathematica solution is here: http://xahlee.org/UnixResource_dir/writ/notations_mma.html R5RS Scheme lisp solution: http://xahlee.org/UnixResource_dir/writ/Sourav_Mukherjee_sourav.work_gmail.… by Sourav Mukherjee also, a Common Lisp solution can be found here: http://groups.google.com/group/comp.lang.lisp/browse_frm/thread/5d1ded8824b… anyone care to give a solution in Python, Perl, javascript, or other lang? am guessing the scheme solution can be much improved... perhaps using some lib but that seems to show scheme is pretty weak if the lib is non-standard. Xah ∑ xahlee.org ☄

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Re: problems trying to build python 2.6 as a shared library
by Marco Nawijn Jan. 19, 2013

Jan. 19, 2013

On Sep 25, 1:08 pm, Chris Withers <ch...(a)simplistix.co.uk> wrote: > Hi All, > > I'm trying to build Python 2.6 as a shared library, so I did: > > ./configure --enable-shared > make > make altinstall > > No obvious signs of failure, but when I try and use the resulting > python, I get: > > python2.6: error while loading shared libraries: libpython2.6.so.1.0: > cannot open shared object file: No such file or directory > > Why might that be? > > cheers, > > Chris > > -- > Simplistix - Content Management, Batch Processing & Python Consulting > -http://www.simplistix.co.uk Hello Chris, The dynamic loader cannot find the python shared library. There are at least 2 options: 1. Add path that contains the shared library to the LD_LIBRARY_PATH environment variable. In a bash shell this can be accomplished by: export LD_LIBRARY_PATH=/path/to/python_shared_lib: $LD_LIBRARY_PATH 2. Add path to dynamic linker configuration file. This typically is in '/etc/ld.so.conf'. See man page for ld for more information. Note that I assumed that you are on a Unix/Linux machine. Regards, Marco

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Weirdness with python and stdin redirection under Win32
by Jonathan M. Gilligan Jan. 18, 2013

Jan. 18, 2013

I am getting an error reading stdin only when I invoke a python script by typing "bar | foo.py" or "foo.py < bar", but not when typing "bar | python foo.py" or "python foo.py < bar". The error arises ecause when input is redirected, stdin has fileno = -1 if the script is invoked as "foo.py", but correctly has fileno = 0 if it is invoked as "python foo.py" Consider the following script, which I want to use as a prototype for a simple stdin --> stdout filter: # foo.py import sys print "fileno = ", sys.stdin.fileno() lines = sys.stdin.xreadlines() for line in lines: sys.stdout.write(line) On win32 (Win2k pro, SP3), using ActiveState ActivePython 2.2.1 build 222, I can execute foo.py either by typing "foo.py" or "python foo.py" on the command line (the relevant registry key for opening .py files has command 'C:\Python22\python.exe "%1" %*'). If I type "echo bar | foo.py", I get C:\>echo bar | foo.py The process tried to write to a nonexistent pipe. fileno = -1 Traceback (most recent call last): File "C:\foo.py", line 7, in ? lines = sys.stdin.readlines() IOError: [Errno 9] Bad file descriptor whereas if I type "echo bar | python foo.py", I get C:\>echo bar | python foo.py fileno = 0 bar Other tests yield: C:\>foo.py < foo.py fileno = -1 Traceback (most recent call last): File "C:\Documents and Settings\Jonathan\My Documents\Programming\Omap VU\Fast CameraDriver\BF_LabView\Leo\foo.py", line 7, in ? for line in lines: IOError: [Errno 9] Bad file descriptor C:\>python foo.py < foo.py fileno = 0 # foo.py import sys print "fileno = ", sys.stdin.fileno() lines = sys.stdin.xreadlines() for line in lines: sys.stdout.write(line) If I just type "foo.py" or "python foo.py" on the command line, I get "fileno = 0" in both cases and the script works identically in both cases. Can anyone explain what's happening? Why the file descriptor for redirected stdin has a fileno of -1 if the python script is invoked using "foo.py" but not when it's invoked with "python foo.py"? Thanks, Jonathan

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www spankwire com - Amazing porn video collection
by babacity4＠gmail.com Dec. 14, 2012

Dec. 14, 2012

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Tcl wasn't installed properly
by Steve Dec. 7, 2012

Dec. 7, 2012

I'm a frequent user of matplotlib on my Windows XP machine. I recently attempted to install a program that modified my Tcl installation, and I now get an error message when I attempt to plot anything in matplotlib. Here is the error message: --- Traceback (most recent call last): File "<stdin>", line 1, in <module> File "C:\Python25\lib\lib-tk\Tkinter.py", line 3758, in _test root = Tk() File "C:\Python25\lib\lib-tk\Tkinter.py", line 1647, in __init__ self.tk = _tkinter.create(screenName, baseName, className, interactive, want objects, useTk, sync, use) _tkinter.TclError: Can't find a usable init.tcl in the following directories: {C:\Program Files\Tcl\lib\tcl8.3} {C:\Program Files\Tcl\lib \tcl8.3} {C:/Prog ram Files/Tcl/lib/tcl8.4} C:/Python25/lib/tcl8.4 C:/lib/tcl8.4 C:/ library This probably means that Tcl wasn't installed properly. --- I attempted a complete reinstall of python (hoping it would reinstall Tcl with correct file paths), but I get the same error. Any suggestions would be appreciated. Thanks!

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No more Python support in NetBeans 7.0
by Kees Bakker Nov. 5, 2012

Nov. 5, 2012

Hi, Sad news (for me, at least), in the upcoming version 7.0 of NetBeans there will be no Python plugin anymore. I have been using NetBeans for Python development for a while now and I was very happy with it. See this archive for details: http://netbeans.org/projects/www/lists/nbpython-dev/archive/2010-11/message… http://netbeans.org/projects/www/lists/nbpython-dev/archive/2011-01/message… -- Kees

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Making `logging.basicConfig` log to *both* `sys.stderr` and `sys.stdout`?
by Michel Albert Oct. 24, 2012

Oct. 24, 2012

Hi, I use python oftentimes to write automation scripts on Linux servers. And there's a big pattern in my scripts: - I *always* use `logging` instead of `print` statements. - I *always* create two stream handlers. One for `sys.stdout` with level `INFO` and one for `sys.stderr` with level `WARN` Well, the levels may variate occasionally, but that's only the rare exception. The reason I do this is simple: Most automation tasks are run via cron. With this setup, I can redirect `stdout` to `/dev/null` and still receive e-mails if things go wrong. And having two handlers gives me more flexibility in my scripts. In one case, I used a different color for error messages for example as this script is run primarily from the shell and having errors stand out has proven to be a good thing. Unfortunately this setup makes `logging.basicConfig` pretty useless. However, I believe that this is something that more people could benefit from. I also believe, that it just "makes sense" to send warnings (and above) to `stderr`, the rest to `stdout`. So I was thinking: "Why does `logging.basicConfig` not behave that way". Naturally, I was thinking of writing a patch against the python codebase and submit it as a suggestion. But before doing so, I would like to hear your thoughts on this. Does it make sense to you too or am I on the wrong track? Are there any downsides I am missing?

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py2exe deal with python command line inside a program
by susan_kijiji＠yahoo.ca Sept. 28, 2012

Sept. 28, 2012

Hi, I need to create a python subprogress, like this: myProcess = subprocess.Popen([sys.executable, 'C:\myscript.py'], env=env, stdin=subprocess.PIPE, stdout=subprocess.PIPE) sys.executable was printed out as ''C:\\Python25\\python.exe'', how can I make this work in executable package through py2exe? I have to fix the following problems: -Source code shouldn't exposed in an executable program -Since python environment is not required when running an executable program, how to deal with the situation that "C:\\Python25\ \python.exe" is required as part of command? Thanks in advance!

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