[Python-Dev] Py2.6 ideas (original) (raw)

Michele Simionato michele.simionato at gmail.com
Wed Feb 21 09:33:00 CET 2007

Michele Simionato <michele.simionato gmail.com> writes:

Finally I did some timing of code like this::

from itertools import imap Point = namedtuple('Point x y'.split()) lst = [(i, i*i) for i in range(500)] def withimap(): for in imap(Point, lst): pass def withstar(): for in (Point(*t) for t in lst): pass and as expected the performances are worse with the * notation

BTW, I take back this point. It is true that the generation expression is slower, but the direct equivalent of imap is starmap and using that I don't see a significant difference in execution times. So it seems that starmap is smart enough to avoid unnecessary tuple unpacking (as you probably know ;-). I still don't like for a subclass to have an incompatible signature with the parent class, but that's just me.

 Michele Simionato

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