filter() — Advanced Playground

Returns elements from an iterable for which a function returns True

Python Playground

# filter() - implementing the protocol
class Custom:
    def __filter__(self):
        return "custom result"

obj = Custom()
print(filter(obj))

Output

Click "Run" to execute your code

Understanding the dunder methods that filter() calls helps you customize behavior for your own classes.

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?