कोडिंग कार्यप्रवाह · रन-लेंथ का सीमित विस्तार

def expand_runs(runs, limit):
    if type(limit) is not int or limit < 0:
        raise ValueError("limit.invalid")
    total = 0
    for value, count in runs:
        if type(value) is not int or not 0 <= value <= 255:
            raise ValueError("byte.invalid")
        if type(count) is not int or count <= 0:
            raise ValueError("count.invalid")
        total += count
        if total > limit:
            raise ValueError("output.limit")
    return bytes(value for value, count in runs for _ in range(count))