python copy浅拷贝与deepcopy深拷贝的区别

话不多说,代码说明问题:
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']]