🌐 Mailman 3 June 2005 - Python-list - python.org

computer algebra packages
by Rahul Feb. 23, 2006

Feb. 23, 2006

Hi. Well is there an open source computer algebra system written in python or at least having a python interface? I know of 2 efforts: pythonica and pyginac...are there any others? rahul

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ANN: ActivePython 2.4.1 for Mac OS X is now available!
by Trent Mick Sept. 17, 2005

Sept. 17, 2005

Today ActiveState is announcing support for Mac OS X. I'm happy to announce that ActivePython 2.4.1 for Mac OS X is now available for free download from: http://www.ActiveState.com/Products/ActivePython/ This brings the number of free ActivePython platforms to four -- with the existing Linux, Solaris and Windows free downloads. Meanwhile, some of you may be interested to know that we are busily working on bringing Komodo to Mac OS X. We expect to offer a beta in August and release later this year. To keep up-to-date with our Mac OS X progress, betas and announcements, we invite you to join our new mailing list: osx-announce(a)ActiveState.com You can join the OS X announce list on the ActiveState Programmer Network (ASPN): http://listserv.activestate.com/mailman/listinfo/osx-announce What is ActivePython? --------------------- ActivePython is ActiveState's quality-assured binary distribution of Python. Builds for Linux, Mac OS X, Solaris and Windows are made freely available. ActivePython includes the Python core and core extensions (zlib 1.2.1, bzip2 1.0.2, bsddb 4.2.52, Tk 8.4.9, and Tix 8.1.4) and is fully compatible with other Python distributions of the same version. ActivePython also includes a wealth of Python documentation, including: - the core Python docs; - Andrew Kuchling's "What's New in Python" series; - the Non-Programmer's Tutorial for Python; - Mark Pilgrim's excellent "Dive into Python"; and - a snapshot of the Python FAQs, HOWTOs and PEPs. Once installed on the Mac, you can find the ActivePython documentation here: /Library/Documentation/Help/ActivePython 2.4 Help/index.html An online version of the docs can be found here: http://aspn.activestate.com/ASPN/docs/ActivePython/2.4/welcome.html Thanks, and enjoy! Trent, Python Tech Lead -- Trent Mick TrentM(a)ActiveState.com

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ANN: PyDev 0.9.4 released
by Fabio Zadrozny Sept. 8, 2005

Sept. 8, 2005

Hi All, PyDev - Python IDE (Python Development Enviroment for Eclipse) version 0.9.4 has just been released. Check the homepage (http://pydev.sourceforge.net/) for more details. Release Highlights: - New PYTHONPATH configuration (for the whole ambient), used for running your files, PyLint, code completion... - Integrated Scott Schleiser patches for the debugger (you won't see any 'implement me' anymore!). - Integrated Heikki Toivonen patch for PyLint using the project pythonpath. - Integrated Heikki Toivonen patch for indentation after '(', '[' and '{' (if the line ends with a comma). - Some StackOverflow errors were removed from code completion. - Keybindings added for Refactoring (powered by bycicle repair man) - check the FAQ. - Some bug-fixes as usual... Regards, -- Fabio Zadrozny ------------------------------------------------------ Software Developer ESSS - Engineering Simulation and Scientific Software www.esss.com.br PyDev - Python Development Enviroment for Eclipse pydev.sf.net pydev.blogspot.com

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Pypy - Which C modules still need converting to py?
by Caleb Hattingh Aug. 30, 2005

Aug. 30, 2005

Hi all I saw it on a webpage a few days ago, can't seem to find it again. Tried a google search for "pypy needed translate C modules" but that didn't turn up what I was looking for. Anyone have that page ref handy listing the C modules that the pypy team need translated into python? thanks Caleb

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Pickling limitation with instances defining __cmp__/__hash__?
by Erik Max Francis Aug. 8, 2005

Aug. 8, 2005

I've come across a limitation in unpickling certain types of complex data structures which involve instances that override __hash__, and was wondering if it was known (basic searches didn't seem to come up with anything similar) and if there is a workaround for it short of restructuring the data structures in question. The fundamental issue rests with defining classes which override __cmp__ and __hash__ in order to be used as keys in dictionaries (and elements of sets). __cmp__ and __hash__ are defined to manipulate a single attribute of the class, which never changes for the lifetime of an object. In a simplified form: class C: def __init__(self, x): self.x = x def __cmp__(self, other): return cmp(self.x, other.x) def __hash__(self): return hash(self.x) Even if C contains other members which are manipulated, making it technically mutable, since the one attribute (in this example, x) which is used for __cmp__ and __hash__ is never changed after the creation of the object, it is legal to use as a dictionary key. (Formally, the atrribute in question is a name which is guaranteed to be unique.) The difficulty arises when the data structures that are built up in C contain a circular reference to itself as a dictionary key. In my particular case the situation is rather involved, but the simplest example which reproduces the problem (using C) would be: c = C(1) c.m = {c: '1'} So far this is fine and behaves as expected. Pickling the object c results in no problems. Unpickling it, however, results in an error: data = pickle.dumps(c) d = pickle.loads(data) # line 25 Traceback (most recent call last): File "/home/max/tmp/hash.py", line 25, in ? d = pickle.loads(data) File "/usr/local/lib/python2.4/pickle.py", line 1394, in loads return Unpickler(file).load() File "/usr/local/lib/python2.4/pickle.py", line 872, in load dispatch[key](self) File "/usr/local/lib/python2.4/pickle.py", line 1218, in load_setitem dict[key] = value File "/home/max/tmp/hash.py", line 15, in __hash__ return hash(self.x) AttributeError: C instance has no attribute 'x' By poking around, one can see that the error is occurring because the unpickler algorithm is trying to use the instance as a key in a dictionary before the instance has been completely initialized (in fact, the __dict__ of this object is the empty dictionary!). The error happens regardless of whether pickle or cPickle is used (so I used pickle to give a more meaningful traceback above), nor whether the protocol is 0 or HIGHEST_PROTOCOL. Is this issue known? I don't see any mention of this kind of circularity in the Python Library Reference 3.14.4. Second, is there any reasonably straightforward workaround to this limitation, short of reworking things so that these self-referenced objects aren't used as dictionary keys? -- Erik Max Francis && max(a)alcyone.com && http://www.alcyone.com/max/ San Jose, CA, USA && 37 20 N 121 53 W && AIM erikmaxfrancis You'll learn / Life is worth it / Watch the tables turn -- TLC

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[ANN] pylint 0.7
by Sylvain Thénault Aug. 5, 2005

Aug. 5, 2005

Hello all ! I'm pleased to announce a new release of PyLint. I've been promising a 1.0 release some time ago, but it appears I've not enough time yet to do the polishing I wish, and since the latest (0.6.4) release has a few really annoying bugs (mainly related to options handling), I eventually decided to make this intermediate release. It mainly targets bug fixes but as the main pylint package has moved (it's not anymore a logilab'subpackage), I've made a 0.7 instead of a 0.6.5. Some others fixes and minor enhancements are included (see below for a more detailed list), and this release should be really stable. Please send any bugs or comments on the mailing list. What's new ? ------------ * WARNING: pylint is no longer a logilab subpackage. Users may have to manually remove the old logilab/pylint directory. * this time, real fix of the "disable-msg in the config file" problem, test added to unittest_lint * fix a bug in the variables checker which may causing some false positives when variables are defined and used within the same statement (test func_noerror_defined_and_used_on_same_line) * fix bug with --list-messages and python -OO * fix possible false positive for W0201 * introduce a new --additional-builtins option to handle user defined builtins * --reports option has now -r as short alias, and -i for --include-ids What is pylint ? ---------------- Pylint is a python tool that checks if a module satisfy a coding standard. Pylint can be seen as another pychecker since nearly all tests you can do with pychecker can also be done with Pylint. But Pylint offers some more features, like checking line-code's length, checking if variable names are well-formed according to your coding standard, or checking if declared interfaces are truly implemented, and much more (see http://www.logilab.org/projects/pylint/ for the complete check list). The big advantage with Pylint is that it is highly configurable, customizable, and you can easily write a small plugin to add a personal feature. The usage it quite simple : $ pylint mypackage.mymodule This command will output all the errors and warnings related to the tested code (here : mypackage.mymodule), will dump a little summary at the end, and will give a mark to the tested code. Pylint is free software distributed under the GNU Public Licence. Home page --------- http://www.logilab.org/projects/pylint Download -------- ftp://ftp.logilab.org/pub/pylint Mailing list ------------ mailto://python-projects@logilab.org Enjoy ! -- Sylvain Thénault LOGILAB, Paris (France). http://www.logilab.com http://www.logilab.fr http://www.logilab.org

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problem using py2exe
by Ho-Kyeong Aug. 1, 2005

Aug. 1, 2005

Can anybody give me a detailed explanation of using extension modules in py2exe? My python code imports 'tkSnack', a extension module, and my setup.py is like this: #setup.py from distutils.core import setup import py2exe setup(name="pitch", scripts=["pitch.py"] ) (that is, pitch.py imports tkSnack.) In cmd, I type 'python setup.py py2exe'. It works well, but I execute the pitch.exe, then error happens. Traceback (most recent call last): File "<string>", line 14, in ? File "<string>", line 7, in pitch File "tkSnack.pyc", line 21, in initializeSnack TclError: can't find package snack I look up in python.org, but I have no idea.

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Re: Building Python with Tcl/Tk on Cygwin_NT-5.1
by Jason Tishler July 25, 2005

July 25, 2005

Dean, Please keep your replies on-list. On Wed, Feb 02, 2005 at 05:14:21AM -0800, Dean N. Williams wrote: > I am trying to do the following according to your notes: > > 3. Due to issues with Cygwin's fork() and DLL base address conflicts, > one should rebase their Cygwin system to prevent fork() failures. Use > the following procedure to rebase your system: > > a. install the Cygwin rebase package (if necessary) > b. shutdown all Cygwin processes > c. start bash (do not use rxvt) > d. execute rebaseall (in the bash window) > > I think this is why idle fails. So I did the above: > > [Dean Williams@ippc ...ASD_work/bin]$ rebaseall > ReBaseImage (/usr/bin/cygexpat-0.dll) failed with last error = 6 > > What am I doing wrong here? It appears you did not follow step b above. Did you shutdown *all* Cygwin processes include services? Jason -- PGP/GPG Key: http://www.tishler.net/jason/pubkey.asc or key servers Fingerprint: 7A73 1405 7F2B E669 C19D 8784 1AFD E4CC ECF4 8EF6

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Centering text in a wx.ListBox w/ wxPython
by fooooo July 22, 2005

July 22, 2005

How do I center each item in the ListBox widget? Also, is it possible to change the color of the selected item? right now it uses the OSes color. I would like it to be consistant on every machine.

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c++ÈçºÎÏòpythonµÄ½Å±¾´«µÝÒ»¸öÀà×÷Îª²ÎÊý¡£
by zghelp July 19, 2005

July 19, 2005

Ê¹ÓÃµœÁËboost.python Ö÷³ÌÐòÈçÏÂ£º using namespace boost::python; struct World { void set(std::string msg) { this->msg = msg; } std::string greet() { return msg; } std::string msg; }; BOOST_PYTHON_MODULE(hello) { class_<World>("World") .def("greet", &World::greet) .def("set", &World::set) ; } int _tmain(int argc, _TCHAR* argv[]) { Py_Initialize(); if (!Py_IsInitialized()) return -1; inithello(); PyRun_SimpleString("import sys"); PyRun_SimpleString("sys.path.append('./')"); PyObject* pName,*pModule,*pDict,*pFunc,*pArgs; pName = PyString_FromString("pytest"); pModule = PyImport_Import(pName); if (!pModule) return -1; pDict = PyModule_GetDict(pModule); if (!pDict) return -1; pFunc = PyDict_GetItemString(pDict,"add"); if (!pFunc || !PyCallable_Check(pFunc)) return -1; World w; w.set("hi from main!"); pArgs = PyTuple_New(3); PyTuple_SetItem(pArgs,0,Py_BuildValue("i",3)); PyTuple_SetItem(pArgs,1,Py_BuildValue("i",4)); PyTuple_SetItem(pArgs,2,Py_BuildValue("O",&w)); try { PyObject_CallObject(pFunc,pArgs); } catch(error_already_set) { // handle the exception in some way } Py_DECREF(pName); Py_DECREF(pArgs); Py_DECREF(pModule); Py_Finalize(); getchar(); return 0; } œÅ±ŸÈçÏÂ£º import hello from hello import * def add(a,b,t): print "a + b = " + str(a+b) w = hello.World() w.set("hi from script!") print w.greet() print t.greet() return œá¹ûÔËÐÐµœprint t.greet()ŸÍÒì³£ÁË ÔõÃŽÑù²ÅÄÜ°ÑÒ»žöÀà×÷Îª²ÎÊýŽ«µÝµœpythonÖÐÈ¥°¢£¿

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