gistfile1.py

# from __future__ import with_statement # py2.5
from contextlib import contextmanager
import logging

@contextmanager
def log_execution_time(log_msg):
    """
    Context manager which logs the time spent doing a
    particular activity.

    Usage:

    ::

        with log_execution_time("get response"):
            self.login()
            response = self.client.post(url, params)
            self.assertRedirects(response, '/')

        # Logs (to debug)
        # get response: 0.10758805275

    """
    start_time = time.time()
    yield
    logging.debug("%s: %s" % (log_msg, time.time() - start_time))