Python中的拷贝

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import copy
a = [1, 2, 3, 4, ['a', 'b']]  #原始对象

b = a  #赋值，传对象的引用
c = copy.copy(a)  #对象拷贝，浅拷贝
d = copy.deepcopy(a)  #对象拷贝，深拷贝

a.append(5)  #修改对象a
a[4].append('c')  #修改对象a中的['a', 'b']数组对象

print 'a = ', a
print 'b = ', b
print 'c = ', c
print 'd = ', d

输出结果：
a =  [1, 2, 3, 4, ['a', 'b', 'c'], 5]
b =  [1, 2, 3, 4, ['a', 'b', 'c'], 5]
c =  [1, 2, 3, 4, ['a', 'b', 'c']]
d =  [1, 2, 3, 4, ['a', 'b']]