Get the last element of any python iterator.

last.py

from typing import Any, Iterator, Optional


def last(iterator: Iterator[Any]) -> Optional[Any]:
    last = None
    for last in iterator:
        continue
    return last


assert(last(iterator=(i for i in range(10))) == 9)  # Generator
assert(last(iterator={"Alice": 1, "Bob": 2, "Carol": 3}) == "Carol")  # Dictionary
assert(last(iterator=[1, 2, 3]) == 3)  # List
assert(last(iterator="abcde") == "e")  # String
assert(last(iterator=[]) is None)  # Empty List
assert(last(iterator="") is None)  # Empty String
print("All tests passed.")