python enumerate

>>> a = [1, 2, 3]
>>> for index, item in enumerate(a):
    print index, item
0 1
1 2
2 3
>>> b = (1, 2, 3)
>>> for index, item in enumerate(b):
    print index, item
0 1
1 2
2 3
>>> c = {'a':1, 'b':2, 'c':3}
>>> for index, item in enumerate(c):
    print index, item
0 a
1 c
2 b
>>> d = "hello world"
>>> for index, item in enumerate(d):
    print index, item
0 h
1 e
2 l
3 l
4 o
5
6 w
7 o
8 r
9 l
10 d