Python generator that flags the last item in an iterable

flag_last.py

import collections

from typing import Generator, Iterable, TypeVar

T = TypeVar('T')

def flag_last(iterable:Iterable[T]) -> Generator[None, tuple[T, bool], None]:
    """
    Yield (item, is_last) for each item in iterable, is_last is True on the
    last item, False otherwise.
    >>> list(flag_last(range(0)))
    []
    >>> list(flag_last(range(1)))
    [(0, True)]
    >>> list(flag_last(range(3)))
    [(0, False), (1, False), (2, True)]
    """
    iterator = iter(iterable)
    queue = collections.deque(maxlen=2)
    try:
        queue.append(next(iterator))
    except StopIteration:
        return
    for item in iterator:
        queue.append(item)
        yield queue.popleft(), False
    yield queue.popleft(), True