What is Membership Operators(in , not in) in Python?

Python is one of the most in-demand programming languages in the market today. The not operator in Python is a part of the Membership Operators in Python. A Membership Operator in Python can be defined as being an operator that is used to validate the membership of a value. This operator is used to test memberships in variables such as strings, integers as well as tuples.

• In Operator: The in operator in Python is used to check if the value exists in a variable or not. When evaluated, if the operator finds a value then it returns true otherwise false. To understand this better, take a look at the example below.
  

# Python program to illustrate 

# Finding common member in list 

# using 'in' operator 

list1=[1,2,3,4,5] 

list2=[6,7,8,9] 

for item in list1: 

    if item in list2: 

        print("overlapping")     

else: 

    print("not overlapping")

Output:

not overlapping

• Not In Operator: This operator is the exact opposite of the in operator. When evaluated this operator returns true if the value isn’t found and false if the value is found. Take a look at the example below to understand this better.

# Python program to illustrate 

# not 'in' operator 

x = 24

y = 20

list = [10, 20, 30, 40, 50 ]; 

 

if ( x not in list ): 

        print ("x is NOT present in given list")

else: 

        print ("x is present in given list")

 

if ( y in list ): 

        print ("y is present in given list")

else: 

        print ("y is NOT present in given list")

Output:

x is NOT present in given list

y is present in given list