Python成员运算符示例

Python成员运算符测试给定值是否为序列中的成员，例如字符串，列表或元组。Python中有两个成员运算符，如下所述 -

实例

假设变量a的值为True，变量b的值为False，参考以下代码实现 -

#!/usr/bin/python3
#coding=utf-8
#save file: membership_operators_example.py

a = 10
b = 20
list = [1, 2, 3, 4, 5 ]

if ( a in list ):
   print ("Line 1 - a is available in the given list")
else:
   print ("Line 1 - a is not available in the given list")

if ( b not in list ):
   print ("Line 2 - b is not available in the given list")
else:
   print ("Line 2 - b is available in the given list")

c=b/a
if ( c in list ):
   print ("Line 3 - a is available in the given list")
else:
   print ("Line 3 - a is not available in the given list")

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

F:\worksp\python>python membership_operators_example.py
Line 1 - a is not available in the given list
Line 2 - b is not available in the given list
Line 3 - a is available in the given list