vze4rx4y at verizon.net
Sun Aug 31 04:33:06 CEST 2003
> I have the following function that compares two filenames based on their
> basename only:
> _basenameCmp = lambda self, *pair: cmp(*map(os.path.basename, pair))
> This is so that I can sort a list of files, and the sorting will be done
> by filename, ignoring path. There is a minor issue which is not so much
> a problem (yet) per se, but just made me curious if there was a better
> way to go about this. When calling .sort() on my list, it takes 16ms to
> complete. Calling .sort(_basenameCmp) on the same list takes 244ms.
> This list could very well be 5 or 10 times the size, in use. Now, I
> believe that my _basenameCmp() needs to be called a lot of times (er..
> can't figure out exactly how many, (len(mylist)/2)^2 ?) and doing a
> string operation that many times is obviously going to slow it down.
> So my question is: Is there anything I could do differently or better
> to speed this up?
A Schwartzian transform will completely remove the function call
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