python中的copy.copy和copy.deepcopy

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‘]]