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