How to achieve the functionality of UserDict.DictMixin in Python 3?

Question

In Python 3 the UserDict.DictMixin class was moved to the collections module. The docs suggest using collections.MutableMapping in its

Answer 1

The "number of methods" are specifically __len__ and __iter__ so the additional work is not that much.

def __len__(self):
    return len(self.mylist)

def __iter__(self):
    for i in self.mylist:
        yield i

Should work, I think (untested, though).