Python: Log the name and output of each method in a Class automatically

Question

I have a module, that is a wrapper class for C programs.

Each method has various inputs, but the outputs are typically the same, a file name.

class Wrapper(object): 
    def wrapper1(self, infile, outfile):
        do_stuff

        log.info('wrapper1:%s' %outfile)

I've already written 50 methods before I realized that I want this behaviour.

Plus, there's got to be an elegant way of adding a logger w/o adding that line to all methods.

Cheers

unutbu · Accepted Answer · 2014-04-24 22:55:42Z

1

Use a decorator:

import functools
def log(func):
    @functools.wraps(func)
    def wrapper(self, infile, outfile):
        retval = func(self, infile, outfile)
        log.info('wrapper1:%s' %outfile)
        return retval
    return wrapper

class Wrapper(object):
    @log
    def wrapper1(self, infile, outfile):
        do_stuff

edited Apr 24, 2014 at 22:55

answered Apr 24, 2014 at 22:48

unutbu

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3 Comments

NewbiZ Over a year ago

Don't forget to forward infile/outfile to func

wbg Over a year ago

I'll have to study that answer, thanks ! And there should be a way to get the name of the method automagically as well correct ?

wbg Over a year ago

ok...I think it got to work...don't understand all the bit just yet...wrapper.__name__ will get me the method name I'm looking for.Let me implement it and then I'll accept...Thanks again.

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