关于Python中深拷贝与浅拷贝的理解（一）---概念

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    

输出为：
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']]