python语法规则

Posted 2020-07-06

 1 >>> 2 or 3,3 or 2
 2 (2, 3)
 3 >>> 0 or 3
 4 3
 5 >>> [] or 3
 6 3
 7 >>> 0 or []
 8 []
 9 
10 # or  从左往右  如果左边操作数是真值则输出左边操作数，否则输出右边
11 
12 >>> 2 and 3, 3 and 2
13 (3, 2)
14 >>> 0 and 3
15 0
16 >>> [] and 0
17 []
18 
19 # and  跟 or  正好相反