Eric Smith <e...@trueblade.com> added the comment:
It occurs to me that Raymond's use case could be satisfied using existing
Python, by slightly changing the format string. After all, str.format()
supports mapping lookup already:
$ ./python.exe
Python 2.6.5+ (release26-maint:79421, Mar 25 2010, 08:51:39)
[GCC 4.2.1 (Apple Inc. build 5646) (dot 1)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> class Default(dict):
... def __missing__(self, key):
... return key
...
>>> s = '{m[name]} was born in {m[country]}'
>>> s.format(m=Default(name='Guido'))
'Guido was born in country'
>>>
Considering that, maybe the best thing is to do nothing. Or maybe update the
documentation with this example.
Plus, you could mix and match this with *args as you'd like.
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<http://bugs.python.org/issue6081>
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