Python __reversed__ Magic Method

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Python’s __reversed__ magic method implements the reversed() built-in function that returns a reverse iterator over the values of the given sequence such as a list, a tuple, or a string.

Syntax

__reversed__(self)

Let’s have a look at an example next.

Example

In the following code, you create a Person class with one name attribute. The __reversed__ dunder method uses slicing with negative step size to return the reversed string object when calling reversed(alice) on a Person object alice.

class Person:
    def __init__(self, name):
        self.name = name

    def __reversed__(self):
        return self.name[::-1]



alice = Person('alice')
print(reversed(alice))
# ecila

Note that the returned string object is an iterator, so this is a perfectly valid implementation of the __reversed__ magic method.

Background Video Reversing a List

Background Video Slicing

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