菜单、购物车逻辑
菜单逻辑
菜单方法1 dic = { "北京":{ "北京1":1, "北京2":2, "北京3":3 }, "上海":{ "上海1":1, "上海2":2, "上海3":3 }, "广州":{ "广州1":1, "广州2":2, "广州3":3 }, "深圳":{ "深圳1":1, "深圳2":2, "深圳3":3 } } tag = True while tag: dic1 = dic for key in dic1: print(key) sru1 = input("这是第一层>>>:").strip() if sru1 == "b":break if sru1 == "q": tag = False if sru1 not in dic1:continue while tag: dic2 = dic1[sru1] for key in dic2: print(key) sru2 = input("这是第二层>>>:").strip() if sru2 == "b": break if sru2 =="q": tag = False continue if sru2 not in dic2: continue
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方法二： dic = { "北京":{ "北京1":1, "北京2":2, "北京3":3 }, "上海":{ "上海1":1, "上海2":2, "上海3":3 }, "广州":{ "广州1":1, "广州2":2, "广州3":3 }, "深圳":{ "深圳1":1, "深圳2":2, "深圳3":3 } } # 逻辑分析： # 1、拿到当前层的菜单字典 # 2、循环打印字典的key # 3、接收用户输入 # 4、进入下一层 layers = [dic,] while True: if len(layers) == 0:break # 1、拿到当前层的菜单字典 cai = layers[-1] # 2、循环打印字典的key for key in cai: print(key) # 3、接收用户输入 sru = input(">>>").strip() if sru == "q":break if sru == "b": layers.pop(-1) continue if sru not in cai:continue # 4、进入下一层 layers.append(cai [sru])
购物车逻辑
import os product_list = [['Iphone7',5800], ['Coffee',30], ['疙瘩汤',10], ['Python Book',99], ['Bike',199], ['ViVo X9',2499], ] shopping_cart={} current_userinfo=[] db_file=r'db.txt' while True: print(''' 1 登陆 2 注册 3 购物 ''') choice=input('>>: ').strip() if choice == '1': #1、登陆 tag=True count=0 while tag: if count == 3: print('\033[45m尝试次数过多，退出。。。\033[0m') break uname = input('用户名：').strip() pwd = input('密码：').strip() with open(db_file,'r',encoding='utf-8') as f: for line in f: line=line.strip('\n') user_info=line.split(',') uname_of_db=user_info[0] pwd_of_db=user_info[1] balance_of_db=int(user_info[2]) if uname == uname_of_db and pwd == pwd_of_db: print('\033[48m登陆成功\033[0m') # 登陆成功则将用户名和余额添加到列表 current_userinfo=[uname_of_db,balance_of_db] print('用户信息为：',current_userinfo) tag=False break else: print('\033[47m用户名或密码错误\033[0m') count+=1 elif choice == '2': uname=input('请输入用户名：').strip() while True: pwd1=input('请输入密码：').strip() pwd2=input('再次确认密码：').strip() if pwd2 == pwd1: break else: print('\033[39m两次输入密码不一致，请重新输入！！!\033[0m') balance=input('请输入充值金额：').strip() with open(db_file,'a',encoding='utf-8') as f: f.write('%s,%s,%s\n' %(uname,pwd1,balance)) elif choice == '3': if len(current_userinfo) == 0: print('\033[49m请先登陆...\033[0m') else: #登陆成功后，开始购物 uname_of_db=current_userinfo[0] balance_of_db=current_userinfo[1] print('尊敬的用户[%s] 您的余额为[%s],祝您购物愉快' %( uname_of_db, balance_of_db )) tag=True while tag: for index,product in enumerate(product_list): print(index,product) choice=input('输入商品编号购物，输入q退出>>: ').strip() if choice.isdigit(): choice=int(choice) if choice < 0 or choice >= len(product_list):continue pname=product_list[choice][0] pprice=product_list[choice][1] if balance_of_db > pprice: if pname in shopping_cart: # 原来已经购买过 shopping_cart[pname]['count']+=1 else: shopping_cart[pname]={'pprice':pprice,'count':1} balance_of_db-=pprice # 扣钱 current_userinfo[1]=balance_of_db # 更新用户余额 print("Added product " + pname + " into shopping cart,\033[42;1myour current\033[0m balance " + str(balance_of_db)) else: print("买不起，穷逼! 产品价格是{price},你还差{lack_price}".format( price=pprice, lack_price=(pprice - balance_of_db) )) print(shopping_cart) elif choice == 'q': print(""" ---------------------------------已购买商品列表--------------------------------- id 商品 数量 单价 总价 """) total_cost=0 for i,key in enumerate(shopping_cart): print('%22s%18s%18s%18s%18s' %( i, key, shopping_cart[key]['count'], shopping_cart[key]['pprice'], shopping_cart[key]['pprice'] * shopping_cart[key]['count'] )) total_cost+=shopping_cart[key]['pprice'] * shopping_cart[key]['count'] print(""" 您的总花费为: %s 您的余额为: %s ---------------------------------end--------------------------------- """ %(total_cost,balance_of_db)) while tag: inp=input('确认购买(yes/no?)>>: ').strip() if inp not in ['Y','N','y','n','yes','no']:continue if inp in ['Y','y','yes']: # 将余额写入文件 src_file=db_file dst_file=r'%s.swap' %db_file with open(src_file,'r',encoding='utf-8') as read_f,\ open(dst_file,'w',encoding='utf-8') as write_f: for line in read_f: if line.startswith(uname_of_db): l=line.strip('\n').split(',') l[-1]=str(balance_of_db) line=','.join(l)+'\n' write_f.write(line) os.remove(src_file) os.rename(dst_file,src_file) print('购买成功，请耐心等待发货') shopping_cart={} current_userinfo=[] tag=False else: print('输入非法') else: print('\033[33m非法操作\033[0m')
