实例说明Python中比较运算符的使用

下表列出了所有python语言支持的比较操作符。假设变量a持有10和变量b持有20，则：

 例如：

试试下面的例子就明白了所有的python编程语言提供的比较操作符：

#!/usr/bin/python

a = 21
b = 10
c = 0

if ( a == b ):
  print "line 1 - a is equal to b"
else:
  print "line 1 - a is not equal to b"

if ( a != b ):
  print "line 2 - a is not equal to b"
else:
  print "line 2 - a is equal to b"

if ( a <> b ):
  print "line 3 - a is not equal to b"
else:
  print "line 3 - a is equal to b"

if ( a < b ):
  print "line 4 - a is less than b" 
else:
  print "line 4 - a is not less than b"

if ( a > b ):
  print "line 5 - a is greater than b"
else:
  print "line 5 - a is not greater than b"

a = 5;
b = 20;
if ( a <= b ):
  print "line 6 - a is either less than or equal to b"
else:
  print "line 6 - a is neither less than nor equal to b"

if ( b >= a ):
  print "line 7 - b is either greater than or equal to b"
else:
  print "line 7 - b is neither greater than nor equal to b"

当执行上面的程序它会产生以下结果：

line 1 - a is not equal to b
line 2 - a is not equal to b
line 3 - a is not equal to b
line 4 - a is not less than b
line 5 - a is greater than b
line 6 - a is either less than or equal to b
line 7 - b is either greater than or equal to b