----------BMI指数小程序----------

menus = ("1, 录入", "2, 查询", "3, 删除", "4, 修改", "5, 退出")

bodies = {}
body_id = 1

while 1:
    for item in menus:
        print(item)
    user_section = input(‘请输入您要选择的菜单项:‘)
    if user_section == ‘1‘:
        flag = True
        while flag:
            dic = {}
            user_input_name = input(‘请输入您的名字:‘)
            while 1:
                user_input_high = input(‘请输入您的身高:‘)
                if not user_input_high.startswith(".") and not user_input_high.endswith(".") and user_input_high.count(".") == 1:
                    break
                else:
                    print("请输入正确的格式")
            user_input_high = float(user_input_high)
            while 1:
                user_input_weight = input(‘请输入您的体重:‘)
                if not user_input_weight.startswith(".") and not user_input_weight.endswith(
                        ".") and user_input_weight.count(".") == 1 or user_input_weight.isdigit():
                    break
                else:
                    print("请输入正确的格式")
            user_input_weight = float(user_input_weight)
            BMI = user_input_weight / (user_input_high ** 2)
            dic[‘name‘] = user_input_name
            dic[‘height‘] = user_input_high
            dic[‘weight‘] = user_input_weight
            dic[‘BMI‘] = BMI
            bodies[body_id] = dic
            body_id += 1
            while 1:
                user_section_a = input(‘是否继续输入(是/否):‘)
                if user_section_a == ‘是‘:
                    break
                elif user_section_a == ‘否‘:
                    print(bodies)
                    flag = False
                    break
                else:
                    print("请按照规定输入")

    elif user_section == ‘2‘:
        flag2 = True
        while flag2:
            user_cha = input(‘输入你想查询的人的id：‘)
            if not user_cha.isdigit():
                print(‘输入错误,请重新输入‘)
            else:
                if int(user_cha) in bodies:
                    print(bodies[int(user_cha)])
                else:
                    print(‘用户不存在‘)

            while 1:
                user_section_b = input(‘是否继续输入(是/否):‘)
                if user_section_b == ‘是‘:
                    break
                elif user_section_b == ‘否‘:
                    flag2 = False
                    break
                else:
                    print("请按照规定输入")

    elif user_section == ‘3‘:
        flag3 = True
        while flag3:
            while 1:
                user_shan = input(‘请输入你要删除的人的id：‘)
                if not user_shan.isdigit():
                    print("非法输入,请重新输入")
                else:
                    break
            user_shan = int(user_shan)
            if user_shan in bodies:
                bodies.pop(user_shan)
                body_id -= 1
                print(bodies)
            else:
                print("用户不存在")

            user_section_b = input(‘是否继续输入(是/否):‘)
            if user_section_b == ‘是‘:
                break
            elif user_section_b == ‘否‘:
                flag3 = False
                break
            else:
                print("请按照规定输入")
    elif user_section == ‘4‘:
        flag4 = True
        while flag4:
            while 1:
                user_section_gai = input(‘请输入你要修改人的id：‘)
                if not user_section_gai.isdigit():
                    print("非法输入,请重新输入")
                else:
                    break
            user_section_gai = int(user_section_gai)
            if user_section_gai in bodies:
                print(‘您要求改的内容为%s‘ % bodies[user_section_gai])
                print(‘请输入修改之后的信息‘)
                gai_name = input("Name:")
                while 1:
                    gai_high = input("High:")
                    if not gai_high.startswith(".") and not gai_high.endswith(".") and gai_high.count(".") == 1:
                        break
                    else:
                        print("输入非法")
                gai_high = float(gai_high)
                while 1:
                    gai_weight = input("weight:")
                    if not gai_weight.startswith(".") and not gai_weight.endswith(".") and gai_weight.count(".") == 1 or gai_weight.isdigit():
                        break
                    else:
                        print("非法输入")
                gai_weight = float(gai_weight)
                gai_BMI = gai_weight / (gai_high ** 2)
                bodies[user_section_gai] = {‘name‘: gai_name, ‘weight‘: gai_weight, ‘high‘: gai_high, ‘BMI‘: gai_BMI}
            else:
                print("用户不存在")
            while 1:
                user_section_b = input(‘是否继续输入(是/否):‘)
                if user_section_b == ‘是‘:
                    break
                elif user_section_b == ‘否‘:
                    flag4 = False
                    break
                else:
                    print("请按照规定输入")
    elif user_section == ‘5‘:
        break
    else:
        print(‘非法输入‘)