How to make an object both a Python2 and Python3 iterator?

Question

This Stack Overflow post is about making an object an iterator in Python.

In Python 2, that means you need to implement an __iter__() method, and a next() method. But in Python 3, you need to implement a different method, instead of next() you need to implement __next__().

How does one make an object which is an iterator in both Python 2 and 3?

I've edited in all the parts you should have included in the first place. Please try to formulate a question that stands on its own, and is not merely a reference to another post. — Martijn Pieters, Apr 11 '15 at 13:40

score 25 · Accepted Answer · answered Apr 11 '15 at 13:38

25

Just give it both __next__ and next method; one can be an alias of the other:

class Iterator(object):
    def __iter__(self):
        return self

    def __next__(self):
        # Python 3
        return 'a value'

    next = __next__  # Python 2

answered Apr 11 '15 at 13:38

Martijn Pieters

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How to make an object both a Python2 and Python3 iterator?

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