[Python-Dev] Py2.6 ideas

[Michele Simionato]

Michele Simionato <michele.simionato <at> 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 with_imap():
>      for _ in imap(Point, lst):
>          pass
> 
>  def with_star():
>      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