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

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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[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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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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psycopg authentication
by jslowery＠gmail.com July 8, 2005

July 8, 2005

Hello, I'm new to both PostgreSQL and psycopg and I'm trying to connect to my database running on localhost. I have postgres setup to do md5 authentication and this works when using a db admin tool on my local network. For some reason, psycopg fails with IDENT authentication. >>> import psycopg >>> psycopg.connect("dbname=jlowery user=jlowery host=localhost password=XXX") Traceback (most recent call last): File "<stdin>", line 1, in ? psycopg.OperationalError: FATAL 1: IDENT authentication failed for user "jlowery" Is there a way to make this module connect with MD5 auth?

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pickle alternative
by simonwittber＠gmail.com July 8, 2005

July 8, 2005

I've written a simple module which serializes these python types: IntType, TupleType, StringType, FloatType, LongType, ListType, DictType It available for perusal here: http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/415503 It appears to work faster than pickle, however, the decode process is much slower (5x) than the encode process. Has anyone got any tips on ways I might speed this up? Sw.

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Python as client-side browser script language
by Rune Strand June 24, 2005

June 24, 2005

What would it take to create a Firefox extension that enables Python as a script language in the browser - just like Javascript? Is it at all possible? Are the hundred good reasons not to bother? I once made an application that used MozPython[1]. It was fun and very fast compared to the Mod_Python I eventually replaced it with. I had to, because of all the mess updating Mozilla caused. ActiveState has a project too [2]. But none of these can replace Javascript Grail used Python as scrpt language, I believe. And by the Win32-wonders of Mr. Hammeond it's possible to use Python in IE. But what aboit a easy-to-install extension for Firefox? Wouldn't that be cool? [1] http://www.thomas-schilz.de/MozPython/README.html [2] http://www.mozilla.org/catalog/architecture/xpcom/pyxpcom/

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How to receive events (eg. user mouse clicks) from IE
by cal_2pac＠yahoo.com June 23, 2005

June 23, 2005

I am trying to trap events from internet explorer eg. when user clicks on an html link - I need to get notified for that event. After looking through the newgroups / internet and reading through various sections in programming python on win32 - I understand that this can be done using DispatchWithEvents. I have also referred to discussions on comp.lang.python http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/a… and http://groups-beta.google.com/group/comp.lang.python/browse_thread/thread/1… So far - none of the newgroups postings report that IE events were trapped successfully (at least I could not find any). However, there is enough evidence that it can be done. My problems at the moment: a) The examples use early binding. However, I cannot get Python makepy to generate the code to force makepy process at run time - since COM makepy utility that I invoke from python win 32 does not have any entry for internet explorer. I tried to find the CLSID for IE 3050F613-98B5-11CF-BB82-00AA00BDCE0B but I get an exception b) Also one of the examples suggest that following code should work > mod = EnsureModule(...) > class MyEvents(mod.IDocumentEvents): > # your methods here.... > handler = MyEvents(ie.document) > # handler should start recieving events. however, what CLSID is to be used in EnsureModule... . I tried with a few but I always get the error 'NoneType' object has no attribute 'IDocumentEvents' An example that 'works' will be very useful

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What are OOP's Jargons and Complexities?
by Xah Lee June 7, 2005

June 7, 2005

What are OOP's Jargons and Complexities Xah Lee, 20050128 The Rise of Classes, Methods, Objects In computer languages, often a function definition looks like this: subroutine f (x1, x2, ...) { variables ... do this or that } In advanced languages such as LISP family, it is not uncommon to define functions inside a function. For example: subroutine f (x1, x2, ...) { variables... subroutine f1 (x1...) {...} subroutine f2 (x1...) {...} } Often these f1 f2 inner functions are used inside f, and are not relevant outside of f. Such power of the language gradually developed into a style of programing. For example: subroutine a_surface () { coordinatesList = ...; subroutine translate (distance) {...} subroutine rotate (angle) {..} } Such a style is that the a_surface is no longer viewed as a function. But instead, a boxed set of functions, centered around a piece of data. And, all functions for manipulating this piece of data are all embodied in this function. For example: subroutine a_surface (arg) { coordinatesList = ... subroutine translate (distance) {set coordinatesList to translated version} subroutine rotate (angle) {set coordinatesList to rotated version} subroutine return () {return coordinatesList} if (no arg) {return coordinatesList} else { apply arg to coordinatesList } } In this way, one uses a_surface as a data, which comes with its owe set of functions: mySurface = a_surface(); mySurface(rotate(angle)); // now the surface data has been rotated mySurface(translate(distance)); // now its translated newSurface = mySurface(return()) So now, a_surface is no longer viewed as a subroutine, but a boxed set of things centered around a piece of data. All functions that work on the data are included in the boxed set. This paradigm possible in functional languages has refined so much so that it spread to other groups and became known as Object Oriented Programing, and complete languages with new syntax catered to such scheme emerged. In such languages, instead of writing them like this: mySurface = a_surface(); mySurface(rotate(angle)); the syntax is changed to like this, for example: mySurface = new a_surface(); mySurfaceRotated = mySurface.rotate(angle); In such languages, the super subroutine a_surface is no longer called a function or subroutine. It is now called a “Class”. And now the variable holding the function "mySurface = a_surface()" is now called a “Object”. Subroutines inside the function a_surface() are no longer called inner-subroutines. They are called “Methods”. The act of assigning a super-subroutine to a variable is called instantiation. This style of programing and language have become so fanatical that in such dedicated languages like Java, everything in the language are “Classes”. One can no longer just define a variable or subroutine. Instead, one creates these meta-subroutine “Classes”. Everything one do are inside Classes. And one assign Classes inside these Classes to create “Objects”. And one uses “Methods” to manipulate Objects. In this fashion, even basic primitives like numbers, strings, and lists are no longer atomic entities. They are now Classes. For example, in Java, a string is a class String. And inside the class String, there are Methods to manipulate strings, such as finding the number of chars, or extracting parts of the string. This can get very complicated. For example, in Java, there are actually two Classes of strings: One is String, and the other is StringBuffer. Which one to use depends on whether you intend to change the data. So, a simple code like this in normal languages: a = "a string"; b = "another one"; c = join(a,b); print c; or in lisp style (set a "a string") (set b "another one") (set c (join a b)) (print c) becomes in pure OOP languages: public class test { public static void main(String[] args) { String a = new String("a string"); String b = new String("another one"); StringBuffer c = new StringBuffer(40); c.append(a); c.append(b); System.out.println(c.toString()); } } Here, the "new String" creates a String object. The "new StringBuffer(40)" creates the changeable string object StringBuffer, with room for 40 chars. "append" is a method of StringBuffer. It is used to join two Strings. Notice the syntax "c.append(a)", which we can view it as calling a inner subroutine "append", on a super subroutine that has been assigned to c, where, the inner subroutine modifies the inner data by appending a to it. And in the above Java example, StringBuffer class has another method "toString()" used to convert this into a String Class, necessary because System.out.println's parameter requires a String type, not StringBuffer. For a example of the complexity of classes and methods, see the Java documentation for the StringBuffer class at http://java.sun.com/j2se/1.4.2/docs/api/java/lang/StringBuffer.html (local copy) In the same way, numbers in Java have become a formalization of many classes: Double, Float, Integer, Long... and each has a bunch of "methods" to operate or convert from one to the other. Instead of aNumber = 3; print aNumber^3; In Java the programer needs to master the ins and outs of the several number classes, and decide which one to use. (and if a program later needs to change from one type of number to another, it is often cumbersome.) This Object Oriented Programing style and dedicated languages (such as C++, Java) have become a fad like wild fire among the programing mass of ignoramuses in the industry. Partly because of the data-centric new perspective, partly because the novelty and mysticism of new syntax and jargonization. It is especially hyped by the opportunist Sun Microsystems with the inception of Java, internet, and web applications booms around 1995. At those times, OOP (and Java) were thought to revolutionize the industry and solve all software engineering problems, in particular by certain "reuse of components" concept that was thought to come with OOP. As part of this new syntax and purity, where everything in a program is of Classes and Objects and Methods, many complex issues and concept have arisen in OOP. We now know that the jargon Class is originally and effectively just a boxed set of data and subroutines, all defined inside a subroutine. And the jargon "Object" is just a variable that has been set to this super subroutine. And the inner subroutines are what's called Methods. ---------- to be continued tomorrow. This is part of an installment of the article “What are OOP's Jargons and Complexities” by Xah Lee, 20050128. The full text is at http://xahlee.org/Periodic_dosage_dir/t2/oop.html © Copyright 2005 by Xah Lee. Verbatim duplication of the complete article for non-profit purposes is granted. The article is published in the following newsgroups: comp.lang.c,comp.lang.c++,comp.lang.lisp,comp.unix.programmer comp.lang.python,comp.lang.perl.misc,comp.lang.scheme,comp.lang.java.programmer comp.lang.functional,comp.object,comp.software-eng,comp.software.patterns Xah xah(a)xahlee.org ∑ http://xahlee.org/

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