Ah good point.  Well, in the case of a sequence argument, an enumerate object could be both a sequence and an iterator. 

On Wed, Sep 30, 2015 at 1:15 PM Alexander Belopolsky <alexander.belopolsky@gmail.com> wrote:

On Wed, Sep 30, 2015 at 12:53 PM, Neil Girdhar <mistersheik@gmail.com> wrote:
A Sequence is an Iterator.

No, a Sequence is an Iterable, not an Iterator:

>>> issubclass(collections.Sequence, collections.Iterator)
>>> issubclass(collections.Sequence, collections.Iterable)