Raymond Hettinger <[email protected]> added the comment:
[AP]
> Does this optimization actually help in real-world cases?
Yes and no. Yes, there are real world cases like ','.join and
'{}'.format that are dramatically sped-up. No, there are probably no
real-world programs that are sped-up significantly in their entirety --
no one optimization will ever do that (Amdahl's law). Pretty much
anytime the substitution gets made there is a savings on second and
subsequent calls (just like any form of caching).
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