timed.py

import time
from contextlib import contextmanager


class TimedResult(object):
    def __init__(self):
        self.started = None
        self.stopped = None

    def start(self):
        self.started = time.time()

    def stop(self):
        self.stopped = time.time()

    @property
    def elapsed(self):
        return self.stopped - self.started

    @property
    def elapsed_millis(self):
        return self.elapsed * 1000


@contextmanager
def timed():
    result = TimedResult()
    result.start()
    try:
        yield result
    finally:
        result.stop()

with timed() as result:
    time.sleep(1)
print "took", result.elapsed_millis