🌐 Mailman 3 September 2006 - Python-list - python.org

Libraries in python
by eduardo.rosa＠gmail.com Sept. 2, 2006

Sept. 2, 2006

Hy people, I'm new in python and comming from JAVA. Something I really like in java is the easy way to add a library to the project. Just put the jar file in the folder ( WEB-INF/lib ) and doesn't need to restart the server ( tomcat ). Can I do some like using python - I'm using apache mod_python? thanks a lot

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Re: Setting "value" of an int-derived class
by Sam Pointon Sept. 2, 2006

Sept. 2, 2006

Ken Schutte wrote: > So, that's good. But, how can I change the value of x from 5 to > something else, without creating a new instance? > > I suppose I could create a function that creates a new "foo" and copies > its attributes, but is there a more direct way? Is the value "5" stored > in some special attribute I can just directly modify? In short, no. In long, ints (and longs, for that matter) are immutable types implemented in a way that Python can't peek at their internals easily, and so are very resistant to mutability. Imagine the results if you mutated 5 to 6 or similar; in fact, you don't want regular numbers to change without some serious hackage. As for subclasses, a similar thing holds: Python programs can't see the internal details. Subclasses just forward the method calls like __add__, __xor__ etc (providing they're not overriden) to the int class, which in turn pokes around at the C level and returns an answer. What you probably want is a proxy class, that forwards all number methods to a wrapped int, and also has a means of setting the wrapped int. A minimal untested implementation: class IntWrapper(object): def __init__(self, num): self.num = num def __getattr__(self, attr): if attr == 'num': return object.__getattr__(self, 'num') return getattr(self.num, attr) Of course, this isn't actually what you asked for, a subclass of int. But, bar hacking on the C level, which is possible but a bit extreme, this is the closest thing to a mutable number. But, personally, I happen to like the memory-wastetastic, new-instance-returning but functionally purer style. It tends to lead to less irreplicable bizarre bugs because of objects seemingley semi-randomly changing state, and Python's garbage collection systems are fairly good at picking up unused objects. ;) --Sam

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Re: Program to backtrack function calls in source code?
by Colin J. Williams Sept. 2, 2006

Sept. 2, 2006

Yu-Xi Lim wrote: > forum(a)anton.e4ward.com wrote: >> many mistakes in programming arise when one changes the code and >> forgets to adjustment somewhere where it is used. Is there a program >> that can extract all place in the source code where a variable is >> accessed or a function called? >> For example in the simplest case I want to change the name of a >> function everywhere in the source... > > The process you describe (renaming a function or variable) is part of > refactoring. Many good IDEs provide extensive automated support for > this, though this functionality seems less common in Python IDEs, likely > due to Python's duck typing. > > Bicycle Repair Man supports the ability to rename functions and > variables at multiple locations, along with other common refactoring > operations. Various Python IDEs and editors can be configured to use > BRM. I personally prefer Eclipse, a Java-based IDE but with good Python > support via PyDev. PyScripter, which is Windows based, provides the ability to link back to the definition of some identifier or to get function references. http://mail.python.org/pipermail/python-announce-list/2006-March/004782.html Colin W.

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Program to backtrack function calls in source code?
by forum＠anton.e4ward.com Sept. 2, 2006

Sept. 2, 2006

Hi, many mistakes in programming arise when one changes the code and forgets to adjustment somewhere where it is used. Is there a program that can extract all place in the source code where a variable is accessed or a function called? For example in the simplest case I want to change the name of a function everywhere in the source... Anton

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NetBeans and Jython
by tatamata Sept. 2, 2006

Sept. 2, 2006

Hello. I installed NetBeans, Jython and Coyote. I hoped that I could use Swing GUI builder intergrated in NetBeans (Matisse?) with Jython in "Delphi" way. But, it seems that I can drag and drop controls only in pure Java application, not in Jython application? Does anybody uses NetBeans as GUI/RAD tool for Jython/Python? Regards, Zlatko

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Re: Managing database tables through web-forms (automatically)
by Antal Rutz Sept. 2, 2006

Sept. 2, 2006

Sybren Stuvel wrote: > Check out Django, it has a great database API and on the fly > auto-generated admin. Just gone over the tutorial, really amazing, exactly what I need. Big thanks for the hint! -- --arutz

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Re: Setting "value" of an int-derived class
by Diez B. Roggisch Sept. 2, 2006

Sept. 2, 2006

Ken Schutte schrieb: > Lets say I want an integer class that lets you attach arbitrary > attributes. I can simply do: > > class foo(int): pass > > x = foo(5) > x.text = "okay" > print x, x.text # prints "5 okay" > > So, that's good. But, how can I change the value of x from 5 to > something else, without creating a new instance? > > I suppose I could create a function that creates a new "foo" and copies > its attributes, but is there a more direct way? Is the value "5" stored > in some special attribute I can just directly modify? You can't do that - the base class is immutable. Subclassing doesn't change that. What you can do of course in to create a class foo that will store its value in an attribute, and overload the arithmetic operators and methods like __int__, __long__ and __float__. Diez

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Re: What do you want in a new web framework?
by Peter Maas Sept. 2, 2006

Sept. 2, 2006

Cliff Wells wrote: > On Wed, 2006-08-23 at 22:13 +0200, Peter Maas wrote: >> Alex Martelli wrote: [...] >>> I have already suggested to the BDFL that he can remedy this situation >>> in Py3k: all he has to do, of course, is to add a LOT more keywords. >> Here is another remedy: he adds one of the frameworks to the standard >> library :) > > That didn't help Tk maintain a monopoly on Python GUI toolkits. I must not be a monopoly. A center of gravity would be nice, too. Peter Maas, Aachen

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Setting "value" of an int-derived class
by Ken Schutte Sept. 2, 2006

Sept. 2, 2006

Lets say I want an integer class that lets you attach arbitrary attributes. I can simply do: class foo(int): pass x = foo(5) x.text = "okay" print x, x.text # prints "5 okay" So, that's good. But, how can I change the value of x from 5 to something else, without creating a new instance? I suppose I could create a function that creates a new "foo" and copies its attributes, but is there a more direct way? Is the value "5" stored in some special attribute I can just directly modify? thanks, Ken

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pictures as characters in a Tk text box?
by Jay Sept. 2, 2006

Sept. 2, 2006

This may be really obscure, but I had a dream about programming something like this, so don't blame me. Is it possible to take a small image or icon and display it as a character in a Tk text box? Think how Thunderbird displays text smilies as actual smiley icons. Or how in AIM as you type a smiley, it replaces it with the picture. Does anyone know how to display these specifically in a Tk text box? Thanks.

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