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：

运算符	描述	示例
==	检查两个操作数的值是否相等，如果是，则条件变为真。	(a == b) 不为 true.
!=	检查两个操作数的值是否等相等，如果值不相等，则条件变为真。	(a != b) 为 true.
<>	检查两个操作数的值是否等相等，如果值不相等，则条件变为真。	(a <> b) 结果为true。这类似于!=运算符。
>	检查左操作数的值是否大于右操作数的值，如果是，则条件成立。	(a > b) 为  true.
<	检查左操作数的值是否小于右操作数的值，如果是，则条件成立。	(a < b) 为true.
>=	检查左操作数的值是否大于或等于右操作数的值，如果是，则条件成立。	(a >= b) 不为 true.
<=	检查左操作数的值是否小于或等于右操作数的值，如果是，则条件成立。	(a <= b) 为 true.

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