On Wed, May 07, 2003 at 02:05:06PM -0500, Skip Montanaro wrote: > I don't know if this still holds true, but at one point during the 2.x > series I think it was pretty expensive to perform imports inside functions, > much more expensive than in 1.5.2 at least (maybe right after nested scopes > were introduced?). If that is still true, moving the import might be false > economy. $ ./python Lib/timeit.py -s "def f(): import sys" "f()" 100000 loops, best of 3: 3.34 usec per loop $ ./python Lib/timeit.py -s "def f(): pass" "import sys; f()" 100000 loops, best of 3: 3.3 usec per loop $ ./python Lib/timeit.py -s "def f(): pass" "f()" 1000000 loops, best of 3: 0.451 usec per loop $ ./python Lib/timeit.py 'import sys' 100000 loops, best of 3: 2.88 usec per loop About 2.8usec would be added to each invocation of the functions in question, about the same as the cost of a global-scope import. This means that you lose overall as soon as the function is called twice. .. but this was about speeding python startup, not just speeding python. <.0375 wink> Jeff
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