# -*- coding: UTF-8 -*-

def  add(a,b):
    '这是一个函数 add'
    sum = a + b
    return sum


def cal_rect_area(lenth,width):
    '计算长方体面积'
    area=lenth*width
    return area

def prt_cut_line(sn):
    '打印一条华丽分割线'
    print('\n-----cutting line {%d}-----'%sn)
    return
