python开发_python中的Boolean运算和真假值 -清零世界

概述

python中的真假值：

2.False

3.zero of any numeric type,for example,0.0,0j.

4.any empty sequence,'',(),[].

5.any empty mapping,for example,{}.

6.instances of user-defined classes,if the class defines a bool() or len() method,when that method returns the integer zero or bool value False. [1]

All other values are considered true — so objects of many types are always true.

Operations and built-in functions that have a Boolean result always return 0 or False for false and 1 or True for true,unless otherwise stated. (Important exception: the Boolean operations or and and always return one of their operands.)

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python开发_python中的Boolean运算和真假值

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