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Naw, `zip` is a builtin in py2. You might be thinking of `itertools.izip`?

zip in py2 returns a tuple type (i.e tries to consumes the iterator through a StopIteration) in py3 it returns a iterator (consumes it on demand).

I'm not near a real REPL, what's the diff? Eager vs. lazy? I think I remember reading something about that change awhile ago.

Exactly. Py3 zip is lazy like py2 izip.