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[3.9] bpo-42248: [Enum] ensure exceptions raised in `_missing_` are released (GH-25350). (GH-25370)

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(cherry picked from commit 8c14f5a787)

Co-authored-by: Ethan Furman <ethan@stoneleaf.us>
This commit is contained in:
Ethan Furman 2021-04-12 15:03:29 -07:00 • committed by GitHub
parent de06baa9de
commit 6379924ecd
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3 changed files with 51 additions and 13 deletions
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31
Lib/enum.py
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@ -669,19 +669,24 @@ def __new__(cls, value):
except Exception as e:
exc = e
result = None
if isinstance(result, cls):
return result
else:
ve_exc = ValueError("%r is not a valid %s" % (value, cls.__qualname__))
if result is None and exc is None:
raise ve_exc
elif exc is None:
exc = TypeError(
'error in %s._missing_: returned %r instead of None or a valid member'
% (cls.__name__, result)
)
exc.__context__ = ve_exc
raise exc
try:
if isinstance(result, cls):
return result
else:
ve_exc = ValueError("%r is not a valid %s" % (value, cls.__qualname__))
if result is None and exc is None:
raise ve_exc
elif exc is None:
exc = TypeError(
'error in %s._missing_: returned %r instead of None or a valid member'
% (cls.__name__, result)
)
exc.__context__ = ve_exc
raise exc
finally:
# ensure all variables that could hold an exception are destroyed
exc = None
ve_exc = None
def _generate_next_value_(name, start, count, last_values):
"""