Timer

import time

class Timer(object):
    def __init__(self, name):
        self.name = name

    def __enter__(self):
        self.start = time.clock()
        return self

    def __exit__(self, *args):
        self.end = time.clock()
        self.interval = self.end - self.start
        print '%s took %.03f sec.' % (self.name, self.interval)

    def __call__(self, f):
        def wrapped_f(*args, **kwargs):
            with self:
                return f(*args, **kwargs)
        return wrapped_f