9.3.3 异常传递

def get_width():
    print("get_width start run")
    num = int(input("please input a num :\n"))
    width_len = 10 / num
    print("get_width end run")
    return width_len
def calc_area():
    print("calc_area start run")
    width_len = get_width()
    print("calc_area end run")
    return width_len ** 2
def show_area():
    try:
        print("show_area start run")
        area_val = calc_area()
        print(f"正方形面积是：{area_val}")
        print("show_area end run")
    except Exception as e:
        print("catch", e)
show_area()