iterating an interator partially then resuming

[ichabod801]

Iterators are objects, just like everything else:

>>> x = list(range(10))
>>> it = iter(x)
>>> for a in it:
...     print(a)
...     if a == 4:
...         break
...
0
1
2
3
4
>>> for b in it:
...     print(b)
...
5
6
7
8
9

However, I don't believe you can make iterators go backwards. You could recreate the iterator. You could also make a wrapper class for an iterator that keeps track of what was already iterated over in a stack, and then call it back somehow.