can I get the index number in for x in y loop?

[Scott David Daniels]

JuHui wrote:
> which one has best performance?
> 
> a:for i in range(0,len(a))
> b:for x in a
> c:for x,y in enumerate(a)

Read up on the timeit module and figure it out for yourself.
The answer will depend on the distribution of your data.

 > but, it seems I can't get index number with b format..:(

Well, that's true, but it is a bit like saying:

     I cannot find the distance in meters between Paris and London with:
         for i in range(10):
             print i

--Scott David Daniels
scott.daniels at acm.org