> from collections import Iterable
> isinstance('abc',Iterable)
True
> isinstance([1,2,3,4],Iterable)
True
> isinstance(1234,Iterable)
False
> isinstance((1,),Iterable)
True
> L = ['a','b','c']
> enumerate(L)
<enumerate object at 0x03AA94E0>
> isinstance(enumerate(L),Iterable)
True
> for m,n in enumerate(L):
...   print m,n 
... 
0 a
1 b
2 c