>>> list(itertools.tee('ABC'))
[<itertools._tee object at 0x109cebe88>, <itertools._tee object at 0x109cf3048>]
>>> g1, g2 = itertools.tee('ABC')
>>> g1
<itertools._tee object at 0x109cf3108>
>>> next(g1)
'A'
>>> next(g2)
'A'
>>> next(g2)
'B'
>>> next(g2)
'C'
>>> next(g2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
StopIteration
>>> list(g1)
['B', 'C']
>>> list(g2)
[]
>>> list(zip(*itertools.tee('ABC')))
[('A', 'A'), ('B', 'B'), ('C', 'C')]
>>>