>>> def n2(n):
...     return n*n
...
>>> fact = n2
>>> fact
<function n2 at 0x000002320B7FC1E0>
>>> fact(5)
25
>>> map(n2, range(11))
<map object at 0x000002320D7752E8>
>>> list(map(fact, range(11)))
[0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100]