def bytes(size: float) -> str:
    if not size:
        return ""
    power = 1024
    t_n = 0
    power_dict = {0: " ", 1: "Ki", 2: "Mi", 3: "Gi", 4: "Ti"}
    while size > power:
        size /= power
        t_n += 1
    return "{:.2f} {}B".format(size, power_dict[t_n])