JuniorTheoryCommon

What does the program print?

Python

it = iter([1, 2])
print(next(it), next(it), next(it, "end"))

1 2 end

Expecting a StopIteration on the third call: it comes only from next(it) with one argument; with a second one, next returns that value when the iterator is used up.
Expecting 1 1, as if next read the list from the start each time: the iterator remembers its position, so every call moves one item further.

JuniorTheoryCommon

Python

it = iter([1, 2])
print(next(it), next(it), next(it, "end"))

1 2 end

Expecting a StopIteration on the third call: it comes only from next(it) with one argument; with a second one, next returns that value when the iterator is used up.
Expecting 1 1, as if next read the list from the start each time: the iterator remembers its position, so every call moves one item further.