模拟购物车的程序，是对之前学习的基础知识----字典、列表、文件的读写、字符的操作等知识的一次模拟练习，但在实际的编程中，将所有功能放在一个函数中实现，无疑减弱了程序的可读性和可维护性，购物车4引进了函数的概念，也将购物车需求经过整理如下：
要求
1、 登录功能
1> 登录验证：1、账户是否被锁定；2、验证用户为注册用户，登录密码是否正确，用户名与密码存放在文件中；
2> 验证失败三次，锁定账户，锁定账户在五分钟内不能再次登录，锁定账：
户存放在文件中。
2、 账户充值
1> 在购物时，出现余额不足是，可进行账户充值；
2> 可读取、保存账户余额。
3、 退出结算
1> 结束购物时，进行购物结算，打印消费信息与账户余额；
2> 购物结束时，保存购物商品信息；
3> 购物结束时，保存账户余额。
4、 购物
1> 打印操作说明；
2> 打印商品列表；
3> 商品分类；
4> 余额不足提示。
5> 购物操作，可根据不同购物类型，选择，显示该类型下商品列表，可选择返回上层目录。
实现代码如下：
def readDirInfo(filename):
‘读取字典列表，依据传递的文件名，获取不同的字典信息‘
nameList = ‘‘
with open(filename, ‘a+‘, encoding=‘utf8‘) as f:
f.seek(0)
nameList = str(f.readlines())
nameList = nameList.strip(‘]‘).strip(‘[‘)
nameList = nameList.strip(‘\"‘).strip(‘\"‘)
if len(nameList) == 0:
return {}
return eval(nameList) #字符转字典
def login(iTime = 3):
‘用户登录操作,包括以下功能:1、判断是否为注册账户； 2、登录账户是否被锁定(注：默认输错用户名密码三次后，锁定账号,五分钟内不能登录)‘
i = 1
flag = False
lock_namelist = readDirInfo(‘locklist.txt‘)
while i <= iTime:
username = input("username:")
password = input("password:")
if loginLock(username,lock_namelist):
print("you username is locked, try again after 5 min")
break
elif logincheck(username,password):
print("welecom to shopping maket")
flag = True
break
elif i == iTime:
print("input more than three times, try again after 5 min")
addLockDir(username, lock_namelist)
break
else:
print("you put an wrong name or password,please input again")
i += 1
return flag,username
def loginLock(name, lock_namelist):
‘判断登录账号是否被锁定，如果被锁定时间超过5分钟，允许用户再次登录‘
flag = False
if name in lock_namelist:
last_time = datetime.datetime.strptime(lock_namelist[name], "%Y-%m-%d %H:%M:%S")
now_time = datetime.datetime.now()
minute = (now_time - last_time)
if int(minute.seconds/60) <= 5:
flag = True
return flag
def logincheck(name,password):
‘是否为注册账号‘
flag = False
name_dir = readDirInfo(‘name.txt‘)
if name in name_dir:
if password == name_dir[name]:
flag = True
return flag
def addLockDir(name,lock_namelist):
‘字典中添加元素，如果元素存在，修改元素的值‘
if name in lock_namelist:
lock_namelist[name] = datetime.datetime.now().strftime( "%Y-%m-%d %H:%M:%S")
else:
lock_namelist[name] = datetime.datetime.now().strftime( "%Y-%m-%d %H:%M:%S")
with open(‘locklist.txt‘, ‘w‘, encoding="utf8") as f_read:
f_read.write(str(lock_namelist))
def PrintOper():
‘打印操作说明‘
prolist = ‘‘‘
*************** 系统操作说明 ****************
q : 退出系统
c : 账号充值
h : 购物记录
l : 商品列表
************************************************
‘‘‘
print(prolist)
def CreateDir():
‘判断文件夹是否存在，如果存在则退出，如果不存在，创建文件夹‘
isExists = os.path.exists(‘History‘)
if not isExists:
os.mkdir(‘History‘)
return isExists
def Exit():
‘退出购物系统,退出时进行购物结算‘
Account()
saveLevelMoney()
exit()
def saveLevelMoney():
with open(‘remain.txt‘,‘w‘,encoding=‘utf8‘) as f:
f.write(str(remain_dir))
def Account():
‘购物计算，将购物信息写入购物历史文件中‘
if len(shopping_cart) == 0:
return False
print("\033[34;1m---------------product list-----------------\033[0m \n \033[42;1m")
temp = ‘id product number pric Totalpric‘
print(temp)
index = 1
total_mon = 0
f = open("product.txt", "a+", encoding="utf8")
now_time = datetime.datetime.now().strftime(‘[%Y-%m-%d %H:%M:%S]‘)
f.write(now_time + ‘\n‘ + temp + ‘\n‘)
temp = ‘‘
for i in shopping_cart.keys():
total_mon += shopping_cart[i][1] * shopping_cart[i][0]
temp = str("%d %10s %7d %7d %7d \n" % (index, i, shopping_cart[i][1], shopping_cart[i][0],
shopping_cart[i][1] * shopping_cart[i][0]))
print(temp)
f.write(temp)
index += 1
f.close()
print("you pay money is:%d \n you level money is: %d \n" % (total_mon, remain_dir[name]))
print("\033[0m \n \033[34;1m-------------end-------------\033[0m")
def Recharge():
‘账号充值操作‘
while True:
temp = input("Please rechange money:")
if temp.isdigit():
if name in remain_dir:
remain_dir[name] += int(temp)
else:
remain_dir[name] = int(temp)
break
print("you input a unknow number,please check it and input again!")
def History():
‘打印历史购物记录‘
filename = ‘History\\‘ + name + ‘.txt‘
filename = filename.rstrip("\\")
print(filename)
if os.path.exists(filename):
with open(filename,‘r‘,encoding=‘utf8‘) as f:
for line in f:
print(line.strip(‘\n‘))
else:
print(‘No you shoppong history‘)
def Operation():
‘用户交互操作‘
while True:
PrintOper()
oper = str(input("Please input you choice:")).strip()
if oper == ‘l‘:
print(‘欢迎进入购物中心‘)
shopping(product_list)
elif oper in Oper_dir:
Oper_dir[oper]()
else:
print("You input no in Oper list!")
continue
def ProductList(print_list):
‘打印商品列表‘
if isinstance(print_list, dict): # 是否为列表
for key in print_list:
print(key)
else:
index = 0
for product in print_list:
print(index, product)
index += 1
print(‘b:‘,‘返回上级菜单‘)
print(‘q:‘,‘退出购物中心‘)
print(‘c‘,‘充值‘)
def shopping(product_list):
‘购物操作‘
current_layer = product_list
while True:
ProductList(current_layer)
choice = input(">>:").strip()
if len(choice) == 0: continue
if choice.isdigit():
choice = int(choice)
if choice >= 0 and choice < len(current_layer):
product = current_layer[choice]
if product[1] <= remain_dir[name]:
if product[0] in shopping_cart:
shopping_cart[product[0]][1] += 1
else:
shopping_cart[product[0]] = [product[1], 1]
remain_dir[name] -= product[1]
print("\033[42;1mAdded product: %s into shoing cart ,you current balance %s \033[0m"
% (product[0], str(remain_dir[name])))
else:
print("\033[42;1m [warning] you balance is no enough\033[0m, product:" + str(
product[1]) + " short for " + str(product[1] - remain_dir[name]))
else:
print("\033[41;1mYou choice product is no in product_list\033[0m")
elif choice in current_layer:
if isinstance(current_layer, dict): # 是否为列表
last_layer.append(current_layer)
current_layer = current_layer[choice]
elif choice == ‘q‘:
break
elif choice == ‘b‘:
current_layer = BackUpLevel(current_layer)
elif choice == ‘c‘:
Recharge(name)
def BackUpLevel(current_layer):
‘返回到商品列表上一层‘
if last_layer:
current_layer = last_layer[-1]
last_layer.pop()
return current_layer
import datetime
import os
product_list = {"生活用品":[[‘毛巾‘,20],
[‘洗衣液‘,80],
[‘衣架‘, 10],
[‘洗衣粉‘,60],
[‘洗发水‘, 80],
[‘厕洗剂‘,50]],
"家电":[[‘电视机‘,5000],
[‘电饭煲‘,300],
[‘电磁炉‘,200],
[‘高压锅‘,800],
[‘电饼铛‘,200]],
}
shopping_cart = {}
Oper_dir = {‘q‘:Exit,‘c‘:Recharge,‘h‘:History}
last_layer = [ product_list ]
remain_dir = readDirInfo(‘remain.txt‘)
flag,name = login()
if flag:
Operation()
时间： 2024-11-15 00:30:23