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

Need Help Creating File Structures
by tim.tadh May 1, 2005

May 1, 2005

Hi I am writing a program that allows a user to annotate text documents, and later html, html variants, and PDF files. My program is able to load multiple documents at once and creat linked anotations between these documents. Therefore i want to create a custom system to save the files. Ideally I want a project description file that gives the program all the neccessary information to build the project when loaded, the document files, and the annotations for the documents. Each document should have its own annotation file. Finally I wanted to put it all in a compressed archive so all the end user has to do is click on the file, and does not have to worry about the annotation files and so forth. However I have no experience doing this, and was wondering what the best way to do this would be. Cheers Tim Henderson

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Debugging threaded Python code
by Derek Thomson May 1, 2005

May 1, 2005

Hi, I frequently have to debug some fairly tricky Python multi-threaded code, and I need some help using the debugger to help me diagnose the problems when they occur. Yes, I know that the best option with threaded code that is problematic is to rewrite it, but that's not really an option that I have (right now). What would really help me is to be able to see a list of all the currently active threads, and the Python stack trace for each. At least then I could see where the failures are happening - deadlocks in particular. I have to spend a lot of time right now just to reach that point. I spent some time trying to achieve this with the Python debugger and couldn't. This has been bugging me for quite a while now, and I'm probably just missing the obvious as usual. Is there some simple way I can do this? Thanks, Derek.

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epydoc and latex math
by simon＠arrowtheory.com May 1, 2005

May 1, 2005

Hi, We have a requirement for latex math (eg. $\sum_i x_i$) in our documentation, and i'm looking at patching epydoc to handle this. We have been using the python doc system (also used by numarray), with a script to rip docstrings into the required latex. However, this method is getting out of hand, and epydoc looks like a great replacement tool. I see nltk and twisted use epydoc, but the project itself seems to be quiet at the moment. Also, I have been subscribed to doc-sig for a while now, but I am utterly confused as to what they are up to. bye, Simon. -- Simon Burton, B.Sc. Licensed PO Box 8066 ANU Canberra 2601 Australia Ph. 61 02 6249 6940 http://arrowtheory.com

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Re: gtk/qt scintilla help !
by John Ridley May 1, 2005

May 1, 2005

fabien wrote on Sun, 01 May 2005 05:40:05 -0700: > Hi, Hello Fabien > I am writing a POV-RAY editor with Python using > either QT or GTK as GUI 'wrapper'. ( I am still trying both ) > > [snip] > > I have also downloaded qscintilla-1.62-gpl-1.5.1. > As for GTK, I also found the LexPOV.cpp file, with > no POV keywords in it and with no POV keywords in > any of the file in the package. > The compilation builds then move the library > libqscintilla.so to /usr/lib/qt3/lib. > > How do I link the newly built library to the folling qt script : > > [snip] QScintilla is a port to Qt of the Scintilla editor control, and PyQt provides the python bindings for it. Scintilla has several dozen lexers (including one for POV), and QScintilla currently provides class wrappers for a small selection of them - but not POV, as you will see from the documentation: http://www.river-bank.demon.co.uk/docs/qscintilla/hierarchy.html Given this, there are two routes you can go down. You could ask the developer of QScintilla to provide support for POV by making a request via the mailing list: http://www.riverbankcomputing.co.uk/pyqt/mailinglist.php Or you could write your own POV lexer class in python using the existing QScintilla APIs. This is not particularly difficult, but it does take some working out. As you already know, a list of POV keywords is required. You will then need to look at the source (LexPOV.cpp and SciLexer.h) to see how the keywords are used and how the lexical states tie up with the SCE_POV enum. QScintilla's lexer classes are mainly wrappers around this information, so once you've worked it out, writing a python class based on QextScintillaLexer is fairly straightforward: >>> class LexerPOV(QextScintillaLexer): >>> def __init__(self, parent, name): >>> QextScintillaLexer.__init__(self, parent, name) >>> def lexer(self): >>> return "pov" >>> def color(self, style): >>> # styles map to (SCE_POV enum) >>> # return your own QColor >>> # or return the base class default >>> return QextScintillaLexer.color(self, style) >>> def keywords(self, set): >>> # if set == 0: >>> # return <pov keywords> >>> # elif ... >>> return 0 >>> def description(self, style): >>> # if style == 0: >>> # return self.tr("Default") >>> # elif ... >>> return QString.null Of course, this is a minimal lexer class - it is possible to be a lot more sophisticated than what is suggested here. John Ridley Send instant messages to your online friends http://uk.messenger.yahoo.com

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Static Methods in Python
by Kris May 1, 2005

May 1, 2005

Hi, I am a newbie to Python. With a background in Java, I was attempting to write static methods in the class without the self as the first parameter, when I got an error. I did a search for the same on Google and found out that there was no consistent approach to this. I would like to know what is the prescribed approach for the same. Any thoughts, pointers about the same would be very much appreciated. Thanks, Kris

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How to kill a SocketServer?
by Paul Rubin May 1, 2005

May 1, 2005

Let's say you have a SocketServer with the threading mix-in and you run serve_forever on it. How can you shut it down, or rather, how can it even shut itself down? Even if you use a handle_request loop instead of serve_forever, it still seems difficult: class myserver(ThreadingMixIn, TCPServer): pass server = myserver(...) server.shutdown = False while not server.shutdown: server.handle_request() Some code in the request handler eventually sets server.shutdown to True (say on receiving a "shutdown" command from the client), but by then the main thread is already blocked waiting for another connection. I ended up having the quit operation actually open a loopback connection after setting the shutdown flag, just to unblock the socket listener. But that seems insane. Is there a better way?

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Re: Tripoli: a Python-based triplespace implementation
by malkarouri＠gmail.com May 1, 2005

May 1, 2005

Dominic Fox wrote: > I have been working on a Python implementation of a modified Tuple > Space (cf Linda, JavaSpaces) that contains only 3-tuples (triples), > and that has operators for copying and moving graphs of triples as > well as sets matching a given pattern. It's called Tripoli, ... Interesting, but I wonder if you are aware of pylinda (http://www-users.cs.york.ac.uk/~aw/pylinda/) and if so, what's the difference? Regards, karouri

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Re: How to kill a SocketServer?
by Paul Rubin May 1, 2005

May 1, 2005

Skip Montanaro <skip(a)pobox.com> writes: > I use precisely that scheme with (I think *) no problem. The only maybe > significant difference I see is that I subclass ThreadingMixin so that it > creates daemon threads: ... According to the docs, you don't need the subclass, you can just set the "daemon_threads" property on the server, e.g. class myserver(ThreadingMixIn, TCPServer): pass server = myserver(...) server.daemon_threads = True server.serve_forever() You have to set the flag before you actually start the server, as above. > (*) Maybe my XML-RPC server actually accepts one more connection after I set > server.shutdown to True before it actually exits. I'll have to take a look > at that. Yes, this is precisely what I'm asking. How do you get the server to go away without going out of your way to connect to it again? Don't you notice if it stays around?

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Whats the best Python Book for me
by John Smith May 1, 2005

May 1, 2005

I already know C/C++ programming and now wish to learn Python to do scripting for some games that are coming out. What book would you recommend. I am thinking Teach Your Self Python in 24 Hours is probably the best place to start...

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are properties thread safe in this context?
by vegetax May 1, 2005

May 1, 2005

Class Req: def __init__(s,headers): s.headers = headers referer =\ property(lambda s:s.headers['Connection'], lambda s,v:s.headers.__setitem__('referer',v)) each thread has its own instance of class Req, Req instances are not shared between threads

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