R. David Murray added the comment: I just had a colleague get confused about the container returning self, and he was referring to the iterator protocol docs at https://docs.python.org/3.6/library/stdtypes.html#iterator.__iter__. If you don't read that section with your thinking cap firmly in place it is easy to get confused about what "the iterator itself" means there. I think it would be beneficial to add a sentence about the iterator state needing to be independent for each iterator returned by the *container's* __iter__. A similar sentence in the tutorial might be all that is needed as well.
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