🌐 Mailman 3 December 2003 - Python-list - python.org

Calling dlls with Calldll/WinDll or Ctypes or...
by piir＠earthlink.net Jan. 12, 2004

Jan. 12, 2004

Hello all, Pardon my ignorance here. I would like to talk to someone that has had success in calling ddls in Windows NT/2000/XP. I am wondering where to dload any of these packages? Google searches keep turning up articles similar to this. Any pointers would be greatly appreciated! Todd

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UML tools for python
by abulka＠netspace.net.au Jan. 6, 2004

Jan. 6, 2004

Whilst almost responding to the 'dream project' thread I decided that this post warranted its own thread. What about a solid UML tool with round trip functionality for the Python Community? Some attempts at reverse engineering python are PyReverse http://www.logilab.org/projects/pyreverse/ PyUt http://pyut.sourceforge.net/ PyNSource http://www.atug.com/andypatterns/pynsource.htm Boa Constructor http://sourceforge.net/projects/boa-constructor/ IDLE's class browser PythonWin 's class browser all of which have their problems and limitations. E.g. PyUt will hang if it cannot __import__ successfully and its GUI has no zoom nor scroll etc. PyReverse is hard to use, misses a lot of basic information and then what do you do with the XML files? - who will read these? I have to edit them manually to import them into Enterprise Architect http://www.sparxsystems.com.au and the last time I tried, you couldn't import into Poseidon http://www.gentleware.com/products/index.php4 community edition, which is the better descendant of the free Argo. Some Java-centric UML tools I believe do export python, though this is usually very simple and usually broken. For example Object Domain http://www.objectdomain.com/products/od/overview.do claims to import python code, but the last I looked, this particular functionality was fragile. Potential powerful technology that could be used is Bicycle Repair Man http://bicyclerepair.sourceforge.net/ a refactoring tool for Python which could be combined with some sort of Java GUI (with zoom and all those niceties) - since the hard bit of the problem is parsing python reliably and knowing how to change it / regenerate it nicely. Bicycle Repair Man already treads deeply in this territory. Also PyChecker http://pychecker.sf.net/ walks similar territory. Ideal tools would look and behave something like ModelMaker (for Delphi) http://www.modelmakertools.com/ TogetherJ http://www.togethersoft.com/products/index.jsp where you can work in code or in diagrams and the two are seamlessly kept in synch. Its truly cool, and I wish I could do these sorts of things in Python. Does anybody know of any other work being done in this area? Do we think that having a solid UML tool with full round trip facilities plus gorgeous GUI - build specifically for Python is a worthy goal? Is anybody going to bother to build such a tool for free? Andy Bulka http://www.atug.com/andypatterns

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Python as a numerical prototyping language.
by Carl Jan. 6, 2004

Jan. 6, 2004

I have been using Python for quite some time now and I love it. I use it mainly for explorative computing and numerical prototyping, ie testing and trying out different kinds of algorithms and computational schemes. The use of Python as my first-choice language has made me extremely productive. Now, I have always believed that Python is a poor performer in terms of numerical speed. My experience, however, is that the efficient use of dictionaries, lists, precompiled numerical libraries, etc makes Python a higly competitive language for scientific computing (in comparison with more traditional languages such as C, C++ and different versions of Fortran). Where is Python heading? Will it be a viable replacement for traditional number-crunching languages in the near-term future? Carl

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Re: Programming language from python
by miki.tebeka＠zoran.com Jan. 6, 2004

Jan. 6, 2004

Hello Alejandro, > I need to create a programming language. Can this be done with the > latest version of python? Yes. There are many compiler tools written in python. Google for "python lex yacc". > Is python the best computer programming > language development tool in the entire universe? I've heard they have some very good programming languages over at Venus :-) A programming language is like a tool, it's good for some things and not good for other things. As a general purpose langauge it's as good a they come. HTH. Miki.

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Re: ANNOUNCE: xsdb -- the eXtremely Simple Database goes alpha
by lipp＠epost.de Jan. 6, 2004

Jan. 6, 2004

hi, thanks for some great ideas and implementations. i'm in the course of testing out whether xsdb could be useful for my present project, and i like it! one minor thing i've found is that when i create a database, populate it, commit, and then re-open it, i get a nasty xsdb.xsdbExceptions.RollBackError: write attempt after younger read exception. this turned out to be avoidable by placing time.sleep(1) between the commit and the re-open. i guess the culprit might be on line 34 of xsdb\Connection.py: self.startTime = int(time()). maybe this should be changed to sth like int(time()*TIME_GRANULARITY), with the constant being a number in the hundreds or thousands? _wolf Aaron Watters <aaron(a)reportlab.com> wrote in message news:<mailman.25.1071054806.9307.python-list(a)python.org>... > ANNOUNCE: xsdb -- the eXtremely Simple Database goes alpha > > Links: > Home page with docs and other links: > http://xsdb.sourceforge.net/ > Sourceforge project with download links > http://sourceforge.net/projects/xsdb/ > > Executive Summary: > > The xsdb package is an open source database implementation implemented > in Python > and hosted on SourceForge. > > The xsdb package provides fundamental concurrent database functionality > with > concurrency control and recovery. Fundamental characteristics include: > > - Extreme portability and ease of installation and use. > - A simple semantics of objects with associated descriptions > compatible with the relational model, object modelling methods, > and other data organizations such as OLAP. > - Multiple access paths and indices. > - Timestamp based concurrency control for safe concurrent database access. > - Commit/Rollback and recovery support. > - A variety of underlying storage implementations with configurable > features and > performance characteristics. > - No intrinsic database size limitations. > > The package is intended to provide what you really need from a database > for most applications, > without the other stuff (among other goals). > > General Technical Notes: > The xsdb package is implemented in Python, and the server mode requires > stackless python. > An xsdb database (not in server mode) will run using standard C Python > or Java Python (Jython). > > Please have a look and give it a try. Thanks very much! > > -- Aaron Watters [attempt 2] > > === > Even in a perfect world where everyone is equal > I'd still own the movie rights and be working on the sequel > -- Elvis Costello "Every day I write the book"

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Project dream
by hwlgw＠hotmail.com Jan. 6, 2004

Jan. 6, 2004

Suppose you have the time and the money to start a new project in Python. What would you like to do? I can think of: - A civilization like game in Python, with multiplayer support via twisted. - An easy to use tool for drawing diagrams, typically various kinds of arrows and circles and boxes, that produces nice .eps and .svg files. - A roguelike in Python. Since there is still no portable curses, it needs WConio or something like that, and also multiplayer would be great. - Something for weblogging and todo things, probably via CGI. What would your favorite be?

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Tkinter and OS X 10.3?
by aahz＠pythoncraft.com Jan. 6, 2004

Jan. 6, 2004

Anyone used Tkinter on 10.3 yet? -- Aahz (aahz(a)pythoncraft.com) <*> http://www.pythoncraft.com/ Weinberg's Second Law: If builders built buildings the way programmers wrote programs, then the first woodpecker that came along would destroy civilization.

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Re: Beginner question - How to effectively pass a large list
by Donn Cave Jan. 5, 2004

Jan. 5, 2004

Quoth Jp Calderone <exarkun(a)intarweb.us>: | On Thu, Dec 18, 2003 at 03:29:55PM -0800, Asun Friere wrote: ... |> What surprised me was that the facially equivalent: |> >>> def f (d=[]) : |> ... d += [0] |> ... print d |> did not do so. Apparently '+=' in regards to lists acts like |> list.apppend, rather than as the assignment operator it looks like. | | list.extend, to be more precise, or list.__iadd__ to be completely precise | :) The maybe-mutate-maybe-rebind semantics of += lead me to avoid its use | in most circumstances. This tacky feature certainly ought to be considered for the chopping block in version 3, for exactly that reason. Donn Cave, donn(a)drizzle.com PS. Good analysis, JR, I learned something from it.

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Socket Programming
by Kamuela Franco Jan. 5, 2004

Jan. 5, 2004

Can someone give me some general information on socket programming in Python. trainee

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Using revised tempfile module
by Edward C. Jones Jan. 5, 2004

Jan. 5, 2004

#! /usr/bin/env python import os, tempfile # I have written code like this several times. It uses the deprecated # function tempfile.mktemp. How do I write this with the new tempfile # functions? def do_something(filename1, filename2): os.system('cat %s > %s' % (filename1, filename2)) filename1 = tempfile.mktemp() filename2 = tempfile.mktemp() try: f = file(filename1, 'w') f.write('abcd') f.close() do_something(filename1, filename2) g = file(filename2, 'r') print g.read() g.close() finally: if os.path.exists(filename1): os.remove(filename1) if os.path.exists(filename2): os.remove(filename2)

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