python 引用/copy/deepcopy

 1 #coding=utf-8
 2 import copy
 3 a=[1,2,‘a‘,‘ab‘,[‘c‘,‘d‘]]
 4 b=a    #只是传引用
 5 
 6 c=copy.copy(a)#copy
 7 d=copy.deepcopy(a)#deepcopy
 8 
 9 a.append(‘f‘)
10 a[4].append(‘m‘)
11 
12 print ‘a:‘,a
13 print ‘b:‘,b
14 print ‘c:‘,c
15 print ‘d:‘,d

1 Python 2.7.9 2 Type "copyright", "credits" or "license()" for more information.
3 >>> ================================ RESTART ================================
4 >>> 
5 a: [1, 2, ‘a‘, ‘ab‘, [‘c‘, ‘d‘, ‘m‘], ‘f‘]
6 b: [1, 2, ‘a‘, ‘ab‘, [‘c‘, ‘d‘, ‘m‘], ‘f‘]
7 c: [1, 2, ‘a‘, ‘ab‘, [‘c‘, ‘d‘, ‘m‘]]
8 d: [1, 2, ‘a‘, ‘ab‘, [‘c‘, ‘d‘]]
9 >>>