>>> from copy import deepcopy, copy
>>> b = copy(a)
>>> b[1] = 8
>>> b
[0, 8, 2]
>>> a
[0, 6, 2]
>>> b = deepcopy(a)
>>> b[1] = 7
>>> b
[0, 7, 2]
>>> a
[0, 6, 2]
>>> a = [[1,2],[3,4]]
>>> b = copy(a)
>>> b[1][1]=9
>>> b
[[1, 2], [3, 9]]
>>> a
[[1, 2], [3, 9]]
>>> b = deepcopy(a)
>>> b[1][1]=5
>>> b
[[1, 2], [3, 5]]
>>> a
[[1, 2], [3, 9]]