python_morsels/tail/tail.py

def tail_v1(sequence, count):
    """My first take at this exercise."""
    if count <= 0:
        return list()
    return list(sequence[-count:])


def tail_v2(sequence, count):
    """This solution can handle any iterator."""
    if count <= 0:
        return []
    return list(list(sequence)[-count:])


def tail_v3(iterable, n):
    """Based on Trey's explanations, this solution is more memory efficient."""
    result = []
    if n > 0:
        for element in iterable:
            if n == 1:
                result = [element]
            else:
                result = [*result[-n + 1 :], element]
    return result


tail = tail_v3