[Python-Dev] PEP 309: Partial method application

Ian Bicking ianb at colorstudy.com
Thu Aug 18 20:05:54 CEST 2005

Raymond Hettinger wrote:
>>>>     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?
> My mistake.  It sorts on the bound method rather than the results of
> applying that method.

Then I thought it might be right to do 
partial(operator.attrgetter('lower')).  This, however, accomplishes 
exactly nothing.  I only decided this after actually trying it, though 
upon reflection partial(function) always accomplishes nothing.

I don't have any conclusion from this, but only mention it to 
demonstrate that callables on top of callables are likely to confuse.

Ian Bicking  /  ianb at colorstudy.com  /  http://blog.ianbicking.org

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