🌐 Mailman 3 June 2009 - Python-list - python.org

How can I install a newer version of python
by nathan.charles.summer＠gmail.com June 1, 2009

June 1, 2009

I am on MacOS 10.5. It has python 2.5.1 installed. How can I install a newer version of python (e.g. 3.1) without breaking my current environment (I am not sure what programs/scripts are using the python comes with MacOS). I just want to use the newer version of python for my own project. I found this "http://wiki.python.org/moin/MacPython/Leopard", but i have no idea what that is related to my situation. Thank you for any tip.

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Re: Challenge supporting custom deepcopy with inheritance
by Scott David Daniels June 1, 2009

June 1, 2009

Michael H. Goldwasser wrote: > Chris, > > Thanks for your well-written reply. Your analogy to the > complexities of other special methods is well noted. I'll accept > the "small price for flexibility" that you note, if necessary. > However, I still desire a cleaner solution. You seem to think that "deepcopy" is a well-defined concept. It is not and cannot be. A copy that understands its own abstractions can work, but sometimes a container is used as a simple abstraction, and sometimes it is used as a container. The choice between the two is not one of structure, but one of intent. A true deepcopy could survive making a copy of the number 23, but might fail as it makes a copy of None, True, or False. Certainly a dictionary might or might not be copied, depending on how the dictionary is used. --Scott David Daniels Scott.Daniels(a)Acm.Org

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Re: Not going to let this drop ...
by Leslie Hawthorn June 1, 2009

June 1, 2009

On Sun, May 31, 2009 at 9:35 PM, Steve Holden <steve(a)holdenweb.com> wrote: > I don't know if Google are planning to run a Highly-Open Participation > event this year, but if they are then maybe we could establish a few > tasks for that. > We are planning to do so in Q4 of this year, further details TBD. I'll make sure Titus Brown is in the loop when we get started planning so he can point me to the right folks who'd like to help with the PSF's participation in GHOP this year. Cheers, LH -- Leslie Hawthorn Program Manager - Open Source Google Inc. http://code.google.com/opensource/ I blog here: http://google-opensource.blogspot.com - http://www.hawthornlandings.org

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Metaclass mystery
by LittleGrasshopper June 1, 2009

June 1, 2009

I am experimenting with metaclasses, trying to figure out how things are put together. At the moment I am baffled by the output of the following code: ************************************ """ Output is: instance of metaclass MyMeta being created (<class '__main__.MyMeta'>, <class '__main__.MyMeta'>) instance of metaclass MyNewMeta being created instance of metaclass MyMeta being created <<<< Why this? (<class '__main__.MyMeta'>, <class '__main__.MyNewMeta'>) """ class MyMeta(type): def __new__(meta, classname, bases, classDict): print 'instance of metaclass MyMeta being created' return type.__new__(meta, classname, bases, classDict) class MyNewMeta(type): def __new__(meta, classname, bases, classDict): print 'instance of metaclass MyNewMeta being created' return type(classname, bases, classDict) """ Notice that a metaclass can be a factory function: def f(classname, bases, classDict): return type(classname, bases, classDict) class MyClass(object): __metaclass__ = f """ class MyClass(object): __metaclass__ = MyMeta print (MyClass.__class__, MyClass.__metaclass__) class MySubClass(MyClass): __metaclass__ = MyNewMeta print (MySubClass.__class__, MySubClass.__metaclass__) ************************************ Honestly, I don't know why this line: instance of metaclass MyMeta being created <<<< Why this? is being output when the MySubClass class object is instantiated. MyNewMeta's __new__ method simply instantiates type directly (which I know shouldn't be done, but I'm just experimenting and trying to understand the code's output.) I would really appreciate some ideas.

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Re: BMP32 for linux
by Scott David Daniels June 1, 2009

June 1, 2009

(1) Please don't top post; it is not the norm here. Re-arrange and prune as I've done below. Djames Suhanko wrote: > <Scott.Daniels(a)acm.org> wrote: >> Djames Suhanko wrote: >>> Hello, all! >>> ... the bmp32 module for linux? This module can to load bmp image >>> with alpha channel where is not supported others images formats. >> Hmmm, why do you think PNG and TGA do not support alpha? > The python in my embbeded system have not support to others formats. :-( > Then, I found a tip about bmp32 with alpha channel, but I don't have > this module (bmp32) in Ubuntu. Sounds like this might be a capability problem on your embedded system. Look for and install PIL (the Python Imaging Library). It might help if you are not simply running up against hardware issues. --Scott David Daniels Scott.Daniels(a)Acm.Org

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Re: BMP32 for linux
by Scott David Daniels June 1, 2009

June 1, 2009

Djames Suhanko wrote: > Hello, all! > Did you know the bmp32 module for linux? This module can to load bmp > image with alpha channel where is not supported others images formats. Hmmm, why do you think PNG and TGA do not support alpha? --Scott David Daniels Scott.Daniels(a)Acm.Org

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Re: subprocess and win32security.ImpersonateLoggedOnUser
by Martin P. Hellwig June 1, 2009

June 1, 2009

Emin.shopper Martinian.shopper wrote: >> The source for subprocess just uses CreateProcess. Which means that, >> short of monkey-patching it, you're going to have to roll your own >> subprocess-like code (I think). Basically, you'll need to run >> CreateProcessAsUser or CreateProcessAsLogonW. They're both a bit >> of a pig in terms of getting the right combination of parameters >> and privileges, > > Thanks. I tried rolling my own via CreateProcessAsUser but it > complained about needing some special permissions so its probably not > going to work. I'd like to try CreateProcessAsLogonW but can't see how > to access that via python. I will start a new thread on the > python-win32 list about that. > > Thanks, > -Emin Maybe this post on my blog http://blog.dcuktec.com/2009/05/python-on-windows-from-service-launch.html can be of some help for you, although it was more thought to run under LocalSystem instead of another active user. -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.'

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Building PIL under Cygwin & Python 2.5
by Erik Johnson June 1, 2009

June 1, 2009

This has apparently been a problematic thing for a while now, as the following article indicates. I first ran into the error message about not being able to remap C:\cygwin\bin\tk84.dll to be the same address as it's parent. Using that information, Google helped me find this article: http://blog.datahammer.info/2008/11/install-pil-under-cygwin-python-25.html After following it's advice and running: $ ./rebase -b 0x1000000000 tk84.dll I was able to get the PIL build to proceed, but when it was done, it said that there was no support built for Tk, and I then noticed that basic Tkinter functionality was broken from the Python interpreter. I went back to Cygwin setup, and had it reinstall the tcl/tk package, and then Tkinter (import from the interactive interp.) got fixed. Googling some more, I found this article (which implied datahammer isn't quite right): http://www.pythonchallenge.com/forums/viewtopic.php?t=135 I ran /usr/bin/rebaseall (from ash)(and if you end up doing this yourself, be aware that it takes a while - I was afraid that process had hung and I was going to have to rebuild the whole Cygwin shooting match from scratch, but it eventually completed (silently)). After this, I checked that Tkinter still worked from Python (it did), and then tore out the whole PIL directory (Imaging-1.1.6) I had tried to install from before, re-extracted the tar file to get a clean install directory, and then again attempted to build PIL. Now, instead of getting the failure message about not being able to remap the dll, the build just hangs: $ python setup.py build_ext -i running build_ext building '_imaging' extension creating build creating build/temp.cygwin-1.5.25-i686-2.5 creating build/temp.cygwin-1.5.25-i686-2.5/libImaging gcc -fno-strict-aliasing -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict- prototypes -DHAVE_LIBJPEG -DHAVE_LIBZ -I/usr/include/freetype2 - IlibImaging -I/usr/include -I/home/ej/python/PIL/jpeg-6b -I/usr/ include/python2.5 -c _imaging.c -o build/temp.cygwin-1.5.25-i686-2.5/ _imaging.o <eventually hit CTRL-C to leave> Now, I'm rather stuck and I'm thinking "This really shouldn't be that hard." So, rebasing (rebaseall'ing) the cygwin system as outlined in the datahammer blog entry (along with the ash advice of the pychallenge article) still doesn't seem to be enough to get a clean build. I think this is an issue that probably needs to be addressed by PIL maintainers that fully understand the root of the problem (and it should probably go in the PIL FAQ), but in the meantime does anyone out there know how to get around this issue? Thanks, -ej

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Re: what I would like python.el to do (and maybe it does)
by J Kenneth King June 1, 2009

June 1, 2009

Giovanni Gherdovich <giovanni.gherdovich(a)sophia.inria.fr> writes: > Hello everybody, > > basically I'm writing here since I cannot > make my python.el work (a major mode for writing > python with emacs), but I would also like to share > my user experience and tell you what I think > an emacs mode should do, why do I like them > and hopefully have some feedbacks to see if I > misunderstood/underestimate something. > > > == 1) my python.el doesn't behave very well == > > I learnt somewhere > http://www.emacswiki.org/emacs/PythonMode > that there are two major emacs mode for python around: > python-mode.el and python.el. > Asking my Emacs 22.3.1 about the variable load-path > issuing > 'C-h v load-path RET > I see that > /usr/share/emacs/22.3/lisp/progmodes > is in that path; there I find a file named > python.elc > which I assume to be some kind of emacs lisp bytecode > since is pretty much unreadable. > > So I searched the web for a plain version of it, > finding that the feature I use more, i.e. > sending a line of a text file to the > python buffer for evaluation (see below), correspond > to the key sequence > > \C-c\C-c > > (well, it's python-send-buffer, so maybe not a single > line but the whole buffer; the closest to my needs, anyway). > However: I open my Emacs, issue M-x python-mode, > then M-x run-python to have the interpreter in > a second buffer, I type something in the > first buffer and then C-c C-c, but nothing happens. > > Am I missing something? > Do I have any hope of having some sort of > send-line-to-python-buffer function working? > > > == 2) How do I use emacs modes for interpreted languages == > > Please note that what follows is just the personal perspective > of an unexperienced user. > > Syntax highlighting is a great thing, but is not as critical > to me as the feature I describe below. > > When I work with interpreted languages, I really hate doing it > in the shell; after 20 commands I easily lose control on > what happens and on which definitions are around. > > I use Emacs instead, so that I can have two buffers; in the > first I type my expressions, in the second I evaluate them > using some key bindings so that I can easily send the text > from the first buffer to the second one line by line. > > In this way I can easily refactor my code, and eventually package it > in a script if I like. > Usually after a while the intepreter buffer is a big mess, > so I restart it but my code is safe and sound in the first buffer. > > To do so, I don't really need a major mode, I admit; I just need > to put the following code in my .emacs: > > (fset 'send-line-other-window > [?\C-a ?\C- ?\C-e ?M-w right > ?C-x ?o ?C-y return ?\C-x ?o]) > (global-set-key [f11] 'send-line-other-window) > > Then I open emacs, C-x 2 to have a second buffer, > C-x o to switch to it and M-x shell to run bash in it. > Then, in the case of python, I run "python" in the > bash buffer. Then I type my code in the first and with F11 > I send lines to the interpreter. > > But since i like to do it The Right Way, I would > like to let the python-mode worry about this... > > Sorry if this is just a bunch of obvious thoughts to most of you. > > Regards, > Giovanni I find that it does work, but unlike SLIME for lisp, it just imports the statement. It confused me at first, but basically the interpreter doesn't provide any feedback to emacs. Try opening a python source file (start python-mode if you don't have an autoload hook) and do C-c C-z to bring up the Python interpreter. Type in a simple assignment statement (like "a = 1 + 2" without the quotes) into the source file. Then just C-c C-c as usual. I never get any feedback. Just C-x o to the interpreter and print out the variable you just defined. It should be there.

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subprocess and win32security.ImpersonateLoggedOnUser
by Emin.shopper Martinian.shopper June 1, 2009

June 1, 2009

Dear Experts, I am having some issues with the subprocess module and how it interacts with win32security.ImpersonateLoggedOnUser. Specifically, I use the latter to change users but the new user does not seem to be properly inherited when I spawn further subprocesses. I am doing something like import win32security, win32con handle = win32security.LogonUser( user,domain,password,win32con.LOGON32_LOGON_INTERACTIVE, win32con.LOGON32_PROVIDER_DEFAULT) win32security.ImpersonateLoggedOnUser(handle) Then spawning subprocesses but the subprocesses cannot read the same UNC paths that that the parent could. Any advice on either spawning subprocesses which inherit parent user properly or changing users in a better way on Windows would be greatly appreciated. Thanks, -Emin

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