[Python-Dev] str.format_from_mapping
Glenn Linderman
v+python at g.nevcal.com
Sun Oct 31 23:28:10 CET 2010
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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