Python reversed() built-in function
From the Python 3 documentation
Return a reverse iterator. seq must be an object which has a __reversed__() method or supports the sequence protocol (the __len__() method and the __getitem__() method with integer arguments starting at 0).
>>> i = reversed([1, 2, 3]) >>> i.__next__() # 3 >>> i.__next__() # 2 >>> i.__next__() # 1 >>> i # <list_reverseiterator object at 0x7f93159ded00>
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