Eli Bendersky added the comment:
The whole point of IntEnum and replacing stdlib constants with it was friendly
str & repr out of the box. This means that "just printing out" an enum member
should have a nice string representation. And "just printing out" means:
print(member)
"%s" % member
"{}".format(member)
!s/!r are quite esoteric - IntEnum should behave in the nicest way possible out
of the box.
Let's just rig IntEnum's __format__ to do the right thing and not worry about
Enum itself. I hope that mixin-with-Enum cases are rare (and most are IntEnum
anyway), and in such rare cases users are free to lift the implementation from
IntEnum.
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<http://bugs.python.org/issue18738>
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