[issue18738] String formatting (% and str.format) issues with Enum

[Eric V. Smith]

Eric V. Smith added the comment:

I don't think it's possible for int (PyLong) to handle a decision to format itself as a string. Personally, I'd like this:

>>> format(3, 's')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Unknown format code 's' for object of type 'int'

To continue to be an error.

This is exactly why the __format__ protocol was added: so a type could make a decision on how it should format itself. My only concern is the fragility of the proposed solution.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18738>
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