Inconsistent result when using StrEnum in f-string

[cappuddono]

Bug report

Bug description:

I define a subclass of StrEnum, and use it in a f-string:

class FruitEnum(StrEnum):
    APPLE = 'apple'

print(f'Example1: {FruitEnum.APPLE}')
# Example1: apple
print(f'Example2: {FruitEnum.APPLE=}')
# Example2: FruitEnum.APPLE=<FruitEnum.APPLE: 'apple'>

The behaviour of printing StrEnum members in f-strings is different. This seems not intuitive. Is this a bug?

CPython versions tested on:

3.12

Operating systems tested on:

Windows

[skirpichev]

Docs says: When the equal sign '=' is provided, the output will have the expression text, the '=' and the evaluated value ... By default, the '=' causes the repr() of the expression to be provided, unless there is a format specified.

So, you get repr output on rhs in the second case. That can be illustrated on simpler example:

>>> s = "xxx"
>>> print(f'{s}')
xxx
>>> print(f'{s=}')
s='xxx'