Message 377804 - Python tracker

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Author	dom1310df
Recipients	barry, dom1310df, eli.bendersky, eric.smith, ethan.furman, rt121212121
Date	2020-10-02.08:46:48
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1601628408.68.0.607597676952.issue41907@roundup.psfhosted.org>
In-reply-to

Content
I believe the regression is due to GH-14545 which "fixed" bpo-37479. The news entry states: "When `Enum.__str__` is overridden in a derived class, the override will be used by `Enum.__format__` regardless of whether mixin classes are present." . The change is in the __format__ method of Enum. It now checks if type(self).__str__ != Enum.__str__ and if True calls str(self). Because Flag defines its own __str__ method, the expression evaluates to True. I do not think this is the indented behaviour. In 3.8.5 str(self) was only called if _member_type_ is object.

I believe the regression is due to GH-14545 which "fixed" bpo-37479. The news entry states:

"When `Enum.__str__` is overridden in a derived class, the override will be used by `Enum.__format__` regardless of whether mixin classes are present."

.

The change is in the __format__ method of Enum. It now checks if type(self).__str__ != Enum.__str__ and if True calls str(self). Because Flag defines its own __str__ method, the expression evaluates to True. I do not think this is the indented behaviour.

In 3.8.5 str(self) was only called if _member_type_ is object.

History
Date	User	Action	Args
2020-10-02 08:46:48	dom1310df	set	recipients: + dom1310df, barry, eric.smith, eli.bendersky, ethan.furman, rt121212121
2020-10-02 08:46:48	dom1310df	set	messageid: <1601628408.68.0.607597676952.issue41907@roundup.psfhosted.org>
2020-10-02 08:46:48	dom1310df	link	issue41907 messages
2020-10-02 08:46:48	dom1310df	create