>>> from zeros import insereix_zeros

--ini-enunciat

>>> it1 = iter([1, -3, -5, -6, 2, 4, -8])
>>> it2 = insereix_zeros(it1)
>>> next(it2)
1
>>> next(it2)
0
>>> next(it2)
-3
>>> for a in it2:
...    print(a, end=',')
-5,-6,0,2,4,0,-8,

>>> for a in insereix_zeros([1, -2, 2, -2, 3, -3, 4, -4]):
...    print(a, end=',')
1,0,-2,0,2,0,-2,0,3,0,-3,0,4,0,-4,

--fi-enunciat