总结Python中逻辑运算符的使用

下表列出了所有python语言支持的逻辑运算符。假设变量a持有10和变量b持有20，则：

 示例:

试试下面的例子就明白了所有的python编程语言提供了逻辑运算符：

#!/usr/bin/python

a = 10
b = 20
c = 0

if ( a and b ):
  print "line 1 - a and b are true"
else:
  print "line 1 - either a is not true or b is not true"

if ( a or b ):
  print "line 2 - either a is true or b is true or both are true"
else:
  print "line 2 - neither a is true nor b is true"


a = 0
if ( a and b ):
  print "line 3 - a and b are true"
else:
  print "line 3 - either a is not true or b is not true"

if ( a or b ):
  print "line 4 - either a is true or b is true or both are true"
else:
  print "line 4 - neither a is true nor b is true"

if not( a and b ):
  print "line 5 - either a is not true or b is not true"
else:
  print "line 5 - a and b are true"

当执行上面的程序它会产生以下结果：

line 1 - a and b are true
line 2 - either a is true or b is true or both are true
line 3 - either a is not true or b is not true
line 4 - either a is true or b is true or both are true
line 5 - either a is not true or b is not true