language-x-isms

[Fredrik Lundh]

Alan Kennedy wrote:

> On jython 2.1, I use something like this
> 
> #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> try:
>   enumerate
> except NameError:
>   def enumerate(iterable):
>     results = [] ; ix = 0
>     for item in iterable:
>       results.append( (ix, item) )
>       ix = ix+1
>     return results

at least in CPython, using a user-defined enumerate function is a bit 
slower than using the built-in version.

in fact, if performance is important, the following can sometimes be the 
most efficient way to loop over things:

     ix = 0
     for fibo in my_list:
         do something with ix and my_list[ix]
         ix += 1

</F>