Pablo Galindo Salgado <[email protected]> added the comment:
This patch makes it slow for small iterators:
Perf program:
import perf
runner = perf.Runner()
runner.timeit("list_comp",
stmt="[x for x in range(10)]",
setup="")
Current master:
❯ ./python.exe ../check.py
.....................
list_comp: Mean +- std dev: 3.97 us +- 0.15 us
PR 12718:
❯ ./python.exe ../check.py
.....................
list_comp: Mean +- std dev: 4.57 us +- 0.17 us
The overhead is very likely due to calling __length_hint__
----------
nosy: +pablogsal
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Python tracker <[email protected]>
<https://bugs.python.org/issue36551>
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