Eric V. Smith added the comment:
It's not whether a field width is specified that makes it "empty" or not, it's
where there's anything in the format specifier at all. I'm trying to simplify
the conversation by using format() instead of str.format(), but I'm not
succeeding!
Going back to str.format examples:
'{}'.format(Test.one)
# equivalent to format(Test.one, '')
# result is Test.one.__format__('')
'{:d}'.format(Test.one)
# equivalent to format(Test.one, 'd')
# result is Test.one.__format__('d')
'{:}'.format(Test.one)
# equivalent to format(Test.one, '')
# result is Test.one.__format__('')
'{:10}'.format(Test.one)
# equivalent to format(Test.one, '10')
# result is Test.one.__format__('10')
In all of these cases, since there is no Test.one.__format__, int.__format__ is
called. int.__format__ contains logic (Python/formatter_unicode.c, line 1422)
that says "if the format specifier is empty, return str(self), otherwise do the
int formatting". This is in order to comply with the previously mentioned PEP
requirement. That's the only place where there's any "treat this as a str
instead of an int" logic.
In order to avoid that logic, and cause more format specifiers to result in
str-like behavior, we'll need to implement an __format__ somewhere (IntEnum, I
guess) that makes the "int or str" decision.
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<http://bugs.python.org/issue18738>
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