点餐系统后续

# 创建一个点餐空列表
orderlist = []
# 主菜单
def main():
    # while死循环
    while True:
        # 打印主菜单
        print('------------欢迎使用点餐系统------------\n本软件提供如下功能：')
        lis = ['1. 点餐', '2. 打印报表', '3. 存储报表', '4. 退出系统']
        for i in lis:
            print(i)
        # 接收用户输入
        a = int(input('请输入数字选择一项功能：'))
        if a == 1:
            print('开始点餐')
            # 调用点餐函数
            order_food()
            continue
        elif a == 2:
            print('正在打印报表')
            # 调用打印报表函数
            print_report()
            continue
        elif a == 3:
            print('正在存储报表')
            # 调用存储报表函数
            save_report()
            continue
        elif a == 4:
            print('成功退出系统')
            # 退出循环
            break
        else:
            print('输入错误请重新输入！!')
            continue

# 点餐
def order_food():
    flag = 1
    while True:
        print("---------欢迎点餐---------\n我们提供的饮品：")
        lis = ['1. 豆浆', '2. 果汁', '3. 牛奶', '0. 不选']
        for i in lis:
            print(i)
        print()
        # 创建餐饮字典
        item = {"豆浆": 3.00, "果汁": 4.50, "牛奶": 3.00, "馒头": 1.00, "包子": 2.50, "鸡蛋": 1.50, "油条": 2.00, "   ": 0.00}
        # 创建空列表，存放饮品价格
        liste = []
        # 创建饮品列表
        ypi = []
        a = int(input('请输入序号选择您需要的饮品：'))
        if a == 1:
            print('您选择了豆浆')
            dj = item["豆浆"]
            ypi = ["豆浆"]
            liste = [dj]
        elif a == 2:
            print('您选择了果汁')
            gz = item["果汁"]
            ypi = ["果汁"]
            liste = [gz]
        elif a == 3:
            print('您选择了牛奶')
            nn = item["牛奶"]
            ypi = ["牛奶"]
            liste = [nn]
        elif a == 0:
            print('不选择')
            k = item["   "]
            ypi = ["   "]
            liste = [k]
        else:
            print('输入错误')
        print()
        print('我们提供的食品：')
        liss = ['1. 馒头', '2. 包子', '3. 鸡蛋', '4. 油条', '0. 不选']
        for i in liss:
            print(i)
        # 创建空列表，存放食品价格
        new_liste = []
        # 创建食品列表
        spin = []
        b = int(input('请输入序号选择您需要的食品：'))
        if b in [1]:
            print('您选择了馒头')
            mt = item["馒头"]
            spin = ["馒头"]
            new_liste = [mt]
        elif b in [2]:
            print('您选择了包子')
            bz = item["包子"]
            spin = ["包子"]
            new_liste = [bz]
        elif b in [3]:
            print('您选择了鸡蛋')
            jd = item["鸡蛋"]
            spin = ["鸡蛋"]
            new_liste = [jd]
        elif b in [4]:
            print('您选择了油条')
            yt = item["油条"]
            spin = ["油条"]
            new_liste = [yt]
        elif b in [0]:
            print('不选择')
            ko = item["   "]
            spin = ["   "]
            new_liste = [ko]
            # 定义一个flag
            flag = 0
            for i in liste:
                if i >= 1:
                    print('饮料费用：￥{:.2f}'.format(float(i)))
                else:
                    print()
            for i in new_liste:
                if i >= 1:
                    print('食物费用：￥{:.2f}'.format(float(i)))
                else:
                    print()
            print()
            money = liste[0] + new_liste[0]
            if money < 1:
                gg = ["", "", ""]
            else:
                gg = [ypi[0], spin[0], money]
            orderlist.append(gg)
        else:
            print('输入错误')
        # flag为0，跳出循环
        if flag == 0:
            break
        else:
            for i in liste:
                if i >= 1:
                    print('饮料费用：￥{:.2f}'.format(float(i)))
                else:
                    print()
            for i in new_liste:
                if i >= 1:
                    print('食物费用：￥{:.2f}'.format(float(i)))
                else:
                    print()
            money = liste[0] + new_liste[0]
            if money < 1:
                gg = ["", "", ""]
            else:
                gg = [ypi[0],spin[0],money]
            orderlist.append(gg)

# 打印报表
def print_report():
    print('--------统计报表--------')
    print('饮料\t\t\t食物\t\t\t花费（元）')
    # 定义一个变量
    Expenses = 0
    # orderlist为空则什么也不做
    if not orderlist:
        pass
    else:
        for i in orderlist:
            for j in i:
                print(j, end='\t\t\t')
            print()
            try:
                # Expenses = Expenses + i[2]
                Expenses += i[2]
            except:
                pass
    print()
    # 打印Expenses{:.2f}为两位小数
    print('累计费用：{:.2f}元'.format(Expenses))
    print()

# 存储报表
def save_report():
    with open('Report_file', 'w+', encoding='utf-8') as file_obj:
        # 写入表头
        file_obj.write('饮料\t\t\t食品\t\t\t花费（元）')
        # 写入换行
        file_obj.write('\n')
        # 重复打印报表
        Expenses = 0
        if not orderlist:
            pass
        else:
            for i in orderlist:
                for j in i:
                    file_obj.write(str(j)+'\t\t\t')
                try:
                    Expenses += i[2]
                    file_obj.write('\n')
                except:
                    pass
        file_obj.write('\n')
        file_obj.write('\t\t\t\t累计费用：{:.2f}元'.format(Expenses))
    print('\n\n------存储完成！\n')


# 调用主菜单函数
if __name__ == '__main__':
    main()