The timeit.Timer class times "code snippets" -- you pass it strings
rather than function objects. That's good for what it's worth, but
sometimes the code you want to time is too big to easily pass as a
string, or maybe you only have access to a function object without the
source, or for whatever reason it's not very convenient.
In this case, a good trick is to import the function by name:
timeit.Timer('spam()', 'from __main__ import spam')
But now I find myself wanting to time a function that's not defined in
__main__. Here's a illustrative example:
def factory():
def f():
return "spam"
return f
def main():
func = factory()
return timeit.Timer('func()', 'from __main__ import func').timeit()
But it doesn't work:
>>> main()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 3, in main
File "/usr/lib/python2.5/timeit.py", line 161, in timeit
timing = self.inner(it, self.timer)
File "<timeit-src>", line 3, in inner
ImportError: cannot import name func
Moving the definition of func into __main__ is not an option. What do I
do? Am I reduced to re-writing the timeit module to take functions
instead of strings? (Maybe I should do that anyway.) Or is there a way to
inject the function object into the namespace used by timeit?
--
Steven
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