22.09.20 16:57, Ethan Furman пише:
> On 9/22/20 12:11 AM, Serhiy Storchaka wrote:
>> The only exception is StrEnum -- overriding __str__ of str
>> subclass may be not safe. Some code will call str() implicitly, other
>> will read the string content of the object directly, and they will be
>> different.
>
> Following up on that:
>
> >>> import enum
> >>>
> >>> class TestStr(enum.StrEnum):
> ... One = '1'
> ... Two = '2'
> ... Three = '3'
> ...
> >>> isinstance(TestStr.One, str)
> True
>
> >>> str(TestStr.One)
> 'TestStr.One'
>
> >>> TestStr.One == '1'
> True
>
> I agree, str.__str__ needs to be used in this case.
It is more interesting to compare '%s' % (TestStr.One,) and
'{}'.format(TestStr.One). Also str.upper(TestStr.One) and
int(TestStr.One) ignore __str__.
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