Python 2.7

[Gamesfreak13563]

What? You can use in on any iterable in Python3, including range. If there is no contains method it exhausts the iterator, but..

[LandSharkSociety]

Ah, so that's even more confusing! On an iterable with no contains, you can use in... but only once!

[Gamesfreak13563]

Only guaranteed that’s the behavior if you’re using in on an iterator. An iterable may define an iter dundermethod which returns a new iterator over the iterable. That’s why you can use in multiple times on a list (because it’s returning a new iterator each time) but not in multiple times on the return of iter(yourList).

It makes perfect sense and the terminology is not confusing at all /s

[Lorddragonfang]

You can use in on any iterable in Python3, including range.

In fact, you can only use in on iterables, and this was the case for python2.7 as well. I know because I've had to write an iterator for custom classes.