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Sat Nov 6 11:43:45 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-November/105311.html

On 11/6/10 1:16 AM, Ezio Melotti wrote:
>> +.. method:: str.format_map(mapping)
>> +
>> + Similar to ``str.forrmat(**mapping)``, except that ``mapping`` is
>> + used directly and not copied to a :class:`dict` . This is useful
>> + if for example ``mapping`` is a dict subclass.
>
>
> Including the "__missing__" example might be better. From the
> description, it's not clear why str.format(**dict_subclass) wouldn't
> work and that the previous line refers to the fact that ** converts the
> mapping in a plain dict, thus making __missing__ and other things unusable.

I agree, but I was hesitant to add a long example. But thinking about it 
some more I think I'll add it.

>> +
>> + self.assertEqual('{foo._x}'.format_map({'foo': C(20)}), '20')
>> +
>
>
> The classes D-H seem unused, did you forget to add some tests or am I
> missing something?

It was a big copy job from the other tests. I'll review them all.

>> +PyDoc_STRVAR(format_map__doc__,
>> + "S.format_map(mapping) -> str\n\
>> +\n\
>> +");
>> +
>
>
> Wouldn't a more verbose docstring be better? (str.format seems to lack
> one too)

Undoubtedly true. Any suggestions? How about (for .format): "Returns S 
formatted with substitutions from args and kwargs."

I also see that __format__'s docstring is similarly terse.

Thanks for reviewing!

-- 
Eric.

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Showing content from https://mail.python.org/pipermail/python-dev/2010-November/105311.html below:

[Python-Dev] [Python-checkins] r86170 - in python/branches/py3k: Doc/library/stdtypes.rst Lib/test/test_unicode.py Misc/NEWS Objects/stringlib/string_format.h Objects/unicodeobject.c