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gh-109653: Improve enum import time by avoiding import of functools #109789

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merged 1 commit into from
Sep 23, 2023
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gh-109653: Improve enum import time by avoiding import of functools #109789

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5 changes: 2 additions & 3 deletions Lib/enum.py
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Original file line number Diff line number Diff line change
@@ -1,8 +1,6 @@
import sys
import builtins as bltns
from types import MappingProxyType, DynamicClassAttribute
from operator import or_ as _or_
from functools import reduce


__all__ = [
Expand Down Expand Up @@ -1884,7 +1882,8 @@ def __call__(self, enumeration):
missed = [v for v in values if v not in member_values]
if missed:
missing_names.append(name)
missing_value |= reduce(_or_, missed)
for val in missed:
missing_value |= val
if missing_names:
if len(missing_names) == 1:
alias = 'alias %s is missing' % missing_names[0]
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2023-09-23-12-47-45.gh-issue-109653.9wZBfs.rst
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@@ -0,0 +1 @@
Reduce the import time of :mod:`enum` by over 50%. Patch by Alex Waygood.
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