For each, say whether it is an iterable that is not an iterator, or an iterator, and whether it can…

Plan. An iterator is what iter returns, and it is used up after one pass. An iterable can give a fresh iterator each time.

1. A list: an iterable. It can be looped over many times.
2. iter([1, 2, 3]): an iterator. Once.
3. A text: an iterable. Many times.
4. A range: an iterable. Many times.
5. A generator expression: an iterator. Once.
6. An open file: an iterator (it gives its lines, and remembers where it is). Once, unless you start again.