count in 'for ... in ...'
Fredrik Lundh
fredrik at pythonware.com
Wed Nov 7 02:30:17 EST 2001
David Bolen wrote:
> > > | for i in range(len(my_list)):
> > > | print i,". ",my_list[i]
> >
> > > What about the following ?
> > >
> > > idx=0
> > > for s in my_list:
> > > print idx,".",s
> > > idx+=1
>
> I'm not sure there's that much of a difference in this case
the former is about 10% faster, in most typical cases.
> but the second form is arguably more readable since the primary
> function (iterating over the list) is more clearly stated, and the
> use of the index variable is clear.
which is exactly why I prefer to use the latter myself.
(but usually spell it out as "idx=idx+1", which isn't only faster, but
also runs under 1.5.2)
</F>
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