def parse_ranges_v1(range_string):
    """This version causes a memory error for huge ranges..."""
    ranges = [tuple(map(int, r.split("-"))) for r in range_string.split(",")]
    result = []
    for start, stop in ranges:
        result = [*result, *list(range(start, stop + 1))]
    for number in result:
        yield number


def parse_ranges_v2(range_string):
    """This version seems more memory efficient."""
    ranges = [tuple(map(int, r.split("-"))) for r in range_string.split(",")]
    for start, stop in ranges:
        for number in range(start, stop + 1):
            yield number


parse_ranges = parse_ranges_v2