[Python-Dev] Fwd: summing a bunch of numbers (or "whatevers")
Mon, 21 Apr 2003 16:58:54 -0400
> > So here's a strawman implementation:
> > def sum(seq, start=0):
> > if isinstance(start, basestring):
> > raise TypeError, "can't sum strings; use ''.join(seq) instead"
> > return reduce(operator.add, seq, start)
> > Alex, go ahead and implement this!
> Coming right up!
For the C implementation, consider bypassing operator.add
and calling the nb_add slot directly. It's faster and fulfills
the intention to avoid the alternative call to sq_concat.
Also, think about whether you want to match to two argument
styles for min() and max():
When the patch is ready, feel free to assign it to me for
the code review.
P.S. Your new builtin works great with itertools.
def dotproduct(vec1, vec2):
return sum(itertools.imap(operator.mul, vec1, vec2))