類似于C++中的引用計數
1 >>> x = 5
2 >>> y = x
3 >>> x == y
4 True
5 >>> x is y
6 True
7 >>> y = 3
8 >>> x == y
9 False
10 >>> x is y
11 False
1 >>> x = 5
2 >>> y = x
3 >>> x == y
4 True
5 >>> x is y
6 True
7 >>> y = 5
8 >>> x == y
9 True
10 >>> x is y
11 True
12 >>> y = 3
13 >>> x == y
14 False
15 >>> x is y
16 False
posted on 2013-05-16 19:21
unixfy 閱讀(95)
評論(0) 編輯 收藏 引用