Python - Membership Operators

Python has membership operators used to check if a value exists in an object or not.

• in - checks if a value exists in an object.
• not in - checks if a value does not exist in an object.

Examples

string0 = "Hello, World!"
print("World!" in string0) # True
print("Hi" in string0) # False

tuple0 = (55, 12, 41, 7, 13)
print(7 in tuple0) # True
print(9 in not tuple0) # True

set0 = { 'bla', 'ble', 7, 11 }
print('bla' in set0) # True
print(9 in not set0) # True