log method decorator

log_decorator.py

import logging

def log_method(fun):
    """
    Example output (it will depend of you logging setup, obviously):
        2013-02-25 16:13:58+0100 [-] DEBUG:root:--> Foo.update_bar
        2013-02-25 16:13:58+0100 [-] DEBUG:root:<-- Foo.update_bar (0.052)
    """
    def with_logging(self, *args, **kwargs):
        method_name = '%s.%s' % (self.__class__.__name__, fun.__name__)
        logging.debug('--> %s' % method_name)
        start = time.time()
        fun(self, *args, **kwargs)
        logging.debug('<-- %s (%.3f)' % (method_name, time.time() - start))
    return with_logging