有关深拷贝与浅拷贝

import copy
a = [1,2,3,[3,3]]
b = copy.copy(a)
print a
[1, 2, 3, [3, 3]]
print b
[1, 2, 3, [3, 3]]
a[3].append('www')
print b
[1, 2, 3, [3, 3, 'www']]

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