Python比较运算符示例

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比较(关系)运算符比较它们两边的值,并确定它们之间的关系。它们也称为关系运算符。假设变量a的值10,变量b的值…

比较(关系)运算符比较它们两边的值,并确定它们之间的关系。它们也称为关系运算符。假设变量a的值10,变量b的值是21,则 –

运算符 描述 示例
== 如果两个操作数的值相等,则条件为真。 (a == b)求值结果为 false
!= 如果两个操作数的值不相等,则条件为真。 (a != b)求值结果为 true
> 如果左操作数的值大于右操作数的值,则条件成为真。 (a > b)求值结果为 false
< 如果左操作数的值小于右操作数的值,则条件成为真。 (a < b)求值结果为 true
>= 如果左操作数的值大于或等于右操作数的值,则条件成为真。 (a >= b)求值结果为 false
<= 如果左操作数的值小于或等于右操作数的值,则条件成为真。 (a <= b)求值结果为 true

实例

假设变量a的值是10,变量b的值是21,参考以下代码实现 –

#!/usr/bin/python3  #coding=utf-8  # save file : comparison_operators_example.py    a = 21  b = 10    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 less than b" )  else:     print ("Line 3 - a is not less than b")    if ( a > b ):     print ("Line 4 - a is greater than b")  else:     print ("Line 4 - a is not greater than b")    a,b=b,a #values of a and b swapped. a becomes 10, b becomes 21    if ( a <= b ):     print ("Line 5 - a is either less than or equal to  b")  else:     print ("Line 5 - a is neither less than nor equal to  b")    if ( b >= a ):     print ("Line 6 - b is either greater than  or equal to b")  else:     print ("Line 6 - b is neither greater than  nor equal to b")  

将上面代码保存到文件: comparison_operators_example.py 中,执行结果如下 –

F:worksppython>python comparison_operators_example.py  Line 1 - a is not equal to b  Line 2 - a is not equal to b  Line 3 - a is not less than b  Line 4 - a is greater than b  Line 5 - a is either less than or equal to  b  Line 6 - b is either greater than  or equal to b  

贺, 贺朝

关于作者: 贺朝

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