Using Python "timeit" to time functions

Python’s timeit module is not intuitive for me.

Steve D’Aprano’s thread on the python mailing list:  Timing a function object… and especially Carl Bank’s response of

def foo(x):
    return x+1

import timeit
timeit.Timer("foo(1)","from __main__ import foo")

was a godsend!

Reading this hint contradicted my blithe statement to friend this morning that “the only time __main__ appears in user code is to determine when a script is being run form the command line”.  Such ignorance and folly!

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