将字符串分割成一行一行
    :param s:
    :param length:
    :return:

def line_break(s, length=76):
    """
    将字符串分割成一行一行
    :param s:
    :param length:
    :return:
    """
    x = '\n'.join(s[pos:pos + length] for pos in range(0, len(s), length))
    return x