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Sun Oct 31 23:28:10 CET 2010 · https://mail.python.org/pipermail/python-dev/2010-October/105121.html

On 10/31/2010 2:02 PM, Benjamin Peterson wrote:
> 2010/10/31 Antoine Pitrou<solipsis at pitrou.net>:
>> >  On Sun, 31 Oct 2010 16:39:44 -0400
>> >  Eric Smith<eric at trueblade.com>  wrote:
>> >
>>> >>  What are your thoughts on adding a str.format_from_mapping (or similar
>>> >>  name, maybe the suggested "format_map") to 3.2? See
>>> >>  http://bugs.python.org/issue6081  . This method would be similar to
>>> >>  "%(foo)s %(bar)s" % d, where d is a dict (or rather any mapping object),
>>> >>  but of course would use str.format syntax: "{foo}
>>> >>  {bar}".format_from_mapping(d).
>> >
>> >  I must be missing something, but what's the difference with
>> >  XXX.format(**d)?
> It allows arbitrary mappings.

Other than the language moratorium, why are arbitrary mappings not 
allowed for the (**d) syntax?
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[Python-Dev] str.format_from_mapping