problem in using enumerate

[deanhystad]

The first for loop uses up all the values in the iterable "e". There is nothing left to use. If you try to get another item, a StopIteration exception is raised.

e = enumerate("abcd")
for index, letter in e:
    print(index, letter)
next(e)

Output:
0 a
1 b
2 c
3 d
Traceback (most recent call last):
  File "...", line 4, in <module>
    next(e)
StopIteration

A for loop does the next(iterable) and try/except StopIteration for you. Kind of like this:

e = enumerate("abcd")
while True:
    try:
        index, letter = next(e)
        print(index, letter)
    except StopIteration:
        break