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总结Python中逻辑运算符的使用

2015-05-13 00:00 796 查看

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

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