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#zip
>>> a = [1, 2, 4]
>>> b = [5, 6, 7]
>>> zip(a, b)
<zip object at 0x0000000002FFB248>
>>> list(zip(a, b))
[(1, 5), (2, 6), (4, 7)]
>>> b = [5, 6]
>>> zip(a, b)
<zip object at 0x0000000002F99748>
>>> list(zip(a, b))
[(1, 5), (2, 6)]
>>> list(zip(b, a))
[(5, 1), (6, 2)]
#enumerate
>>> a = [3, 5, 1, 3, 2]
>>> enumerate(a)
<enumerate object at 0x0000000002FF5318>
>>> list(enumerate(a))
[(0, 3), (1, 5), (2, 1), (3, 3), (4, 2)]
>>> list(enumerate(a, 1))
[(1, 3), (2, 5), (3, 1), (4, 3), (5, 2)]
#map
>>> a = [1, 4, 5]
>>> list(map(lambda x: x+1, a))
[2, 5, 6]
>>> list(map(str, a))
['1', '4', '5']