线上订餐系统初步python
介绍
今天心血来潮，就做了一个简单的线上订餐系统。有些不完善的地方，还请各位大佬多多包容。这里没有用到数据库，所以数据安全性还有待考究
import json
import time
import os
#open vip information
with open("foodShop_VipData.json", "r") as f:
data = json.load(f)
# all the dishes
S = [["salad", 2.5], ["bread", 0.5], ["soup", 1.5]] # small bug:length of S,M,D must be the same
M = [["beef", 10.0], ["pork", 6.0], ["chicken", 7.5]]
D = [["cake", 2.0], ["fruit", 1.0],["cookies",0.5]]
purchase = []
def Purchase(menu_choice):
lst = []
while True:
choice = input("what do you want to buy(enter \"none\" to exit):")
if menu_choice == "starter" and choice in list(dict(S).keys()):
lst.append([choice, dict(S)[choice]])
print(f"{choice} ordered!\n")
elif menu_choice == "main" and choice in list(dict(M).keys()):
lst.append([choice, dict(M)[choice]])
print(f"{choice} ordered!\n")
elif menu_choice == "dessert" and choice in list(dict(D).keys()):
lst.append([choice, dict(D)[choice]])
print(f"{choice} ordered!\n")
elif choice == "none":
print("")
return lst
else:
print(f"we don't have {choice} in {menu_choice}, sorry！")
def SubMenu(lst,name):
cnt=1
print(f"\n{name} menu is:\n********************")
print("name\tprice")
for i in lst:
print(f"{cnt}.{i[0]}\t{i[1]}pounds")
cnt+=1
print("********************")
def ShowMenu():
print("\nwelcome to Jimmy's shop")
print("********************")
print("1.starter\n2.main\n3.dessert\n4.exit")
print("********************")
#vip set and purchase system
while True:
option = input("choose menu:starter/main/dessert:")
time.sleep(0.5)
if option == "1" or option == "starter":
SubMenu(S,"starter")
purchase.append(Purchase("starter"))
elif option == "2" or option == "main":
SubMenu(M, "main")
purchase.append(Purchase("main"))
elif option == "3" or option == "dessert":
SubMenu(D, "dessert")
purchase.append(Purchase("dessert"))
elif option == "exit" or option == "4":
print("")
return purchase
else:
print("invalid input\n")
def AUT(): # authentication
print("remember, you can enter \"exit\" to leave this page")
cnt = 0
while True:
cnt += 1
name = input("enter your username:")
password = input("enter your password:")
if name == "exit" or password == "exit":
return [False, 0]
elif cnt >= 3:#limit log in times:3
print("you have logged in for too many times!")
return [False, 0]
#searching username and password in json document
for i in range(len(data)):
if name == data[i][0] and password == data[i][1]:
return [True, name]
print("user name or password incorrect\n")
def Register(): # how to become a vip
name = input("enter your user name:")
while True:
password = input("enter your password:")
if len(password)<4:
print("password too short, length should be above 3")
else:
break
deposit = input("enter how much to store( must be over 50 pounds):")
if deposit.isdigit():
deposit = int(deposit)
if deposit >= 50:#when the amount is greater than quota
data.append([name, password, deposit])
with open("foodShop_VipData.json", "w") as f1:
json.dump(data, f1)
print("register successful!\n")
time.sleep(0.5)
return True
else:
print("deposit should be above 50!")
return False
else:
print("invalid input!")
return False
#
def PayBill(isVIP, List, username=""): # is ordered and
if List == [[[]]]: # not ordered
decision=input("you have not ordered anything yet!\ndo you want to order now?:")
if decision=="yes":
return 1 #continue
else:
return 2#exit to main page
else: #payment section
Sum=ShowOrder(List)
if isVIP == True:
orderList=Modi(List,True,username)
Sum=ShowOrder(orderList)
variable = SubroutineVIP(data, username, Sum)
return 0
else:
orderList=Modi(List,False,money)
Sum=ShowOrder(orderList)
Subroutine(money, Sum)
return 0
#modify orderList information
def Modi(orderList,isVIP,username="",money=0):
accu=0
print("add items/delete items/ready to pay")
choice = input("enter your choice:")
if choice == "add items":
print("enter \"done\" when you ready")
while True:
item = input("enter the name of dish:")
if item=="done":#out of loop if finished
print("")
break
for foodLst in [S,M,D]:#search if item is in S, M or D
accu+=FindItem(foodLst,item)#get the price of item
if accu==0:
print(f"sorry, we don't have {item}")
else:#append the items to the order list and then do some output
orderList[0].append([item,accu])
elif choice == "delete items":
isIn=False
print("enter \"done\" when you ready")
while True:
itemDelete = input("enter the name of dish to delete:")
if itemDelete=="done":
print("")
break
for sublst in orderList:
for info in sublst:
if itemDelete in info:
sublst.remove(info)
isIn=True
if isIn==False:
print(f"you didn't order {item}")
elif choice == "ready to pay":
pass
else:
print("invalid input")
return orderList
def FindItem(category,item):#finds if item is in a multidimentional list and returns the price
for i in category:
for j in i:
if item in j:
return j[1]#returns the price of the item
return 0#when the item is not in the list
def ShowOrder(orderList):
Sum=0
cnt = 1
print("you have ordered:")
for i in orderList:
for j in i:
print(cnt, ".", j[0])
Sum += j[1]
cnt += 1
print(f"{Sum} pounds in total\n")
time.sleep(0.5)
return Sum#the total cost of this meal
#vip payment method
def SubroutineVIP(data, username, moneyRequired): # direct pay first
for b in data:
# deposit is greater than cost
if username in b:
if moneyRequired <= b[2]:
b[2] -= moneyRequired#the money left in account
else:
print("sorry, you don't have enough money!")
print("1.charge money\n2.check balance\n3.cancel order")
choice=input("enter your choice:")
if choice=="1" or choice=="charge money":
dif=moneyRequired-b[2]
while True:
amount=int(input(f"you need at least {dif}pounds:"))
if amount修改S,M,D里面的元素数量对程序的运行时毫无影响的，如果您想修改S,M,D三个列表里面装的元素类别（比如从”主食“换到“小吃”），您可能就要小费一番周折了：您需要修改ShowMenu()和Purchase()函数中的一些内容。
但是如果您想修改列表数量，比如从S,M,D三个列表，变成S,M,D,R,那您就要修改这段代码的很多地方，比如Main()函数里面的“VIP channel” if语句，你就要在循环中加多R以对该列表中所有内嵌列表中的第二个元素值也就是食物价格进行修改。另外，您还需要在Purchase()和ShowMenu()函数中新增if判断。
除了代码量以外，这段代码还是不难的，涉及的python知识也比较初级，几乎所有学python的朋友都能看懂这个代码和逻辑。