How do I create user-defined warnings?

[Clay Hobbs]

I already know how to make user-defined exceptions, like this one:

class MyException(Exc eption):
pass

But for a module I'm making, I would like to make a warning (so it just
prints the warning to stderr and doesn't crash the program). I have
tried this:

class MyWarning(Warni ng):
pass

And it behaves like a normal error. Please help me, I can't figure out
what I'm doing wrong.

--
Ratfink

[Hans Nowak]

Re: How do I create user-defined warnings?

Clay Hobbs wrote:

I already know how to make user-defined exceptions, like this one:
>
class MyException(Exc eption):
pass
>
But for a module I'm making, I would like to make a warning (so it just
prints the warning to stderr and doesn't crash the program). I have
tried this:
>
class MyWarning(Warni ng):
pass
>
And it behaves like a normal error. Please help me, I can't figure out
what I'm doing wrong.

Are you using the warning with 'raise'? Don't do that, use warnings.warn instead:

In [1]: import warnings

In [2]: class MyWarning(Warni ng): pass
...:

In [3]: warnings.warn(M yWarning("bah humbug"))
/Library/Frameworks/Python.framewor k/Versions/2.5/lib/python2.5/site-packages/IPython/FakeModule.py:1 :
MyWarning: bah humbug
# -*- coding: utf-8 -*-

--
Hans Nowak (zephyrfalcon at gmail dot com)

http://4.flowsnake.org/