Optimising literals away
benjamin at python.org
Mon Aug 30 18:00:13 CEST 2010
Tobias Weber <towb <at> gmx.net> writes:
> whenever I type an "object literal" I'm unsure what optimisation will do
> to it.
> def m(arg):
> if arg & set([1,2,3]):
> return 4
> Is the set created every time the method is called?
Yes, and the list.
> What about a
> Or tuple vs list?
Tuples containing other immutable literals can be optimized. (In cpython anyway.)
> After how many calls per second does it pay
> to save it at the module level?
Ask the profiler. Probably not many.
> Would anybody else find this ugly?
I do it all the time.
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