Membership operators are used to check whether a value or variable is found in a sequence (such as a string, list, or tuple). They are used to check if a value is present in a list or not.

Types of Membership Operators

1. in: Returns True if the value is found in the sequence
2. not in: Returns True if the value is not found in the sequence

in operator

x = [1, 2, 3]
print(1 in x)   # Output: True
print(5 in x)   # Output: False

not in operator

x = [1, 2, 3]
print(1 not in x)   # Output: False
print(5 not in x)   # Output: True

In the above examples, the in operator returns True if the value is present in the list, and False if it is not. The not in operator works in the opposite way, returning True if the value is not present in the list, and False if it is.

in operator with strings

x = 'Hello World'
print('H' in x)    # Output: True
print('z' in x)    # Output: False

The membership operators can also be used to check if a particular character is present in a string or not.

It is important to note that these operators work on any type of sequence in python such as strings, lists, and tuples.

In summary, Membership Operators are used to check if a value is present in a sequence or not. They are very useful for checking if an item exists in a list or not and can also be used with strings to check if a particular character is present in a string or not.