9. Membership operations
Membership operators are used to test if a sequence is presented in an object.
9.1. Membership operations
Membership operators are useful to determine the presence of an element in a sequence, such as a string or list.
Operator |
Evaluates to ``True`` if: |
Example |
|
---|---|---|---|
in |
A variable value is in a sequence |
|
|
not in |
A variable value is not in a sequence |
|
Example of membership operation in strings:
a = 'o'
b = 'John'
print(f'{a} in {b} is {a in b}') # o in John is True
print(f'{a} not in {b} is {a not in b}') # o not in John is False
Example of membership operation in lists:
x = 7
value_list = [1, 2, 3, 4]
print(x in value_list)
print(x not in value_list)