>>> from pf import *

>>> l = range(5)

>>> map_list(lambda x: x**2, l)
[0, 1, 4, 9, 16]
>>> it1 = map_iter(lambda x: x**2, l)
>>> iter(it1) is it1
True
>>> list(it1)
[0, 1, 4, 9, 16]
>>> list(it1)
[]
>>> it1 = map(lambda x: x**2, l)
>>> iter(it1) is it1
True
>>> list(it1)
[0, 1, 4, 9, 16]

>>> filter_list(lambda x: x % 2 == 0, l)
[0, 2, 4]
>>> it1 = filter_iter(lambda x: x % 2 == 0, l)
>>> iter(it1) is it1
True
>>> list(it1)
[0, 2, 4]
>>> it1 = filter(lambda x: x % 2 == 0, l)
>>> iter(it1) is it1
True
>>> list(it1)
[0, 2, 4]

>>> reduce_list(lambda s, x: s + x, l, 0)
10
>>> reduce_iter(lambda s, x: s + x, l, 0)
10
>>> from functools import reduce
>>> reduce(lambda s, x: s + x, l, 0)
10
>>>