Iterators can be shared in Python e.g., here's a well-known grouper recipe (traverse `it` iterator in chunks of `N` items each):

     zip(*[it]*N)

Example:

    >>> L = [1, 2, 3, 4]
    >>> *zip(*[iter(L)]*2),
    ((1, 2), (3, 4))

Here's the single result of the iter() call is shared. The purpose is to show that iterator can be shared in principle (ignore other aspects of the code).