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[3.11] gh-93035: [Enum] Fix IntFlag crash when no single-bit members (GH-93076) (GH-93197)

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`EnumType` attempts to create a custom docstring for each enum/flag, but that was failing with pathological flags that had no members (only multi-bit aliases).
(cherry picked from commit 08cfc3dabf)

Co-authored-by: Tobin Yehle <tobinyehle@gmail.com>
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Miss Islington (bot) 2022-05-25 10:50:24 -07:00 • committed by GitHub
parent 0fb70ce191
commit 37a7f1b099
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Lib/enum.py
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@ -538,7 +538,7 @@ class EnumType(type):
#
# create a default docstring if one has not been provided
if enum_class.__doc__ is None:
if not member_names:
if not member_names or not list(enum_class):
enum_class.__doc__ = classdict['__doc__'] = _dedent("""\
Create a collection of name/value pairs.