How to write a warning to my log file?

[MarkyMarc]

Hi All,

A small newbie Q.

I have made a nice log function in me program. The program writes some
data to me mysql database.
When I write to the database I get som warnings back.

Have do I write these to me log file?
I know I have to use the the warnings api. But I can not figure out
how to use it.
Is there anyone take might give me a small example.

THX all

 

[Jay Loden]

Hi All,

A small newbie Q.

I have made a nice log function in me program. The program writes some
data to me mysql database.
When I write to the database I get som warnings back.

Have do I write these to me log file?
I know I have to use the the warnings api. But I can not figure out
how to use it.
Is there anyone take might give me a small example.

THX all

It looks like what you need to do is override the warnings module's showwarning function:

showwarning(message, category, filename, lineno[, file])
Write a warning to a file. The default implementation calls
formatwarning(message, category, filename, lineno) and writes
the resulting string to file, which defaults to sys.stderr.
You may replace this function with an alternative implementation
by assigning to warnings.showwarning.


Example:

#!/usr/bin/python

import warnings

def mywarn(message, category, filename, lineno, file="warnings.log"):
handle = open(file, 'a')
handle.write(warnings.formatwarning(message, category, filename, lineno))
handle.close()

warnings.showwarning = mywarn

#now test it
warnings.warn('test warn message')

-Jay