[Tutor] Re: modifying list of strings during iteration (without index)?

[Jeff Kowalczyk]

"Bob Gailer" wrote:
> To replace in site:
> for i in range(len(li)):
>    li[i] = li[i].strip()

[jtk] Ah, hence the enumerate function due in 2.3... Thanks.

PEP 279: The enumerate() Built-in Function
A new built-in function, enumerate(), will make certain loops a bit clearer.
enumerate(thing), where thing is either an iterator or a sequence, returns a iterator that
will return (0, thing[0]), (1, thing[1]), (2, thing[2]), and so forth.
Fairly often you'll see code to change every element of a list that looks like this:
for i in range(len(L)):
    item = L[i]
    # ... compute some result based on item ...
    L[i] = result

This can be rewritten using enumerate() as:
for i, item in enumerate(L):
    # ... compute some result based on item ...
    L[i] = result