Re: Which is faster?

On Aug 29, 9:26 pm, cnb <circularf...@xxxxxxxx> wrote:
def av_grade(self):
     return sum(review.grade for review in self.reviews) / \
              len(self.reviews)

Minor point. Consider making the divisor: float(len(self.reviews)).
It would be a bummer to throw-off the average because of floor
division.

Also consider an itertools approach:
sum(itertools.imap(operator.itemgetter('review'), self.reviews))

BTW, the sum() in Py2.6 is *much* faster than before. It should run
circles around any other approach.

As Effbot says, if you really care about speed, then just time both
approaches. However, it's a good run of thumb that builtins are hard
to beat by simulating them in pure python (unless you're using Psyco
as an optimizer).


Raymond
.