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))
# ecilaNote 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
Where to Go From Here?
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