AI engineering glossary · Python core
What is membership operator?
Membership operator: The in and not in operators, which test whether a value occurs inside a container such as a string, list, tuple, set or dictionary. For dictionaries the test applies to keys. Lookup in sets and dictionaries is much faster than in lists.
Membership operator: an example
'a' in 'banana' is True, 3 in [1, 2] is False, and 'name' in {'name': 'Ravi'} is True.
Related terms
More Python core terms
Where you learn it
Membership operator is part of the AI Engineering Program, which teaches it with notes, a hands-on lab and an exam. The first lesson is free.