[Python-Dev] PEP 309: Partial method application

[Steven Bethard]

Raymond Hettinger wrote:
> [Ian Bicking]
> > I think partial() misses an important use case of method getting, for
> > instance:
> >
> >      lst = ['A', 'b', 'C']
> >      lst.sort(key=partialmethod('lower'))
>
> We've already got one:
>
>        lst.sort(key=operator.attrgetter('lower'))

Doesn't that just sort on the str.lower or unicode.lower method object?

py> sorted(['A', u'b', 'C'], key=operator.attrgetter('lower'))
[u'b', 'C', 'A']
py> sorted(['A', u'b', 'C'], key=partialmethod('lower')) # after
fixing arg -> args bug
['A', u'b', 'C']

STeVe
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