Novice small white Python road Day4 (shopping cart applet)

Directly on Demand:

Shopping Cart Procedure
Demand
After you start the program, let the user enter the payroll, and then print the list of items
Allow users to purchase items based on their product number
After the user selects the product, checks whether the balance is sufficient, enough on the direct debit, not enough to remind
You can exit at any time, and when you exit, print the purchased goods and balances

A relatively simple program, using a list of operations written, wrote six functions

Abnormal () to determine if the entered number is valid by throwing an exception

Commodity () take out the product parameter name price

Addshoppingcart () Add to Cart

Shopping () Judge whether the wages can buy the goods, can add to the shopping cart

Printlibray () Print List listing

Printpurchase () Print purchase list upon exit

#!/usr/bin/env python#-*-coding:utf-8-*-#Author:linghanchujian"""Shopping Cart Program requirements start the program, let the user enter the payroll, and then print the product list allows users to buy goods according to the product number of the user to select goods, check whether the balance is sufficient, enough to direct debit, enough to remind you can exit at any time, exit, print the purchased goods and balances"""Iswhile=Truecommoditylibray= [["IPhone", 5800],["Mac Pro", 12000],["Starbuck Latte", 31],["Alex Python", 81],["Bike", 800]]shoppingcart= []#Shopping CartBalance=-1#Balance"""to determine whether the entered number is valid by throwing an exception"""defAbnormal (Num):Try: Int (Num)returnTrueexceptValueError:Print()        returnFalsePass"""Remove the product parameter"""defCommodity (num,libray,number): forI,jinchEnumerate (libray):ifi==Number :returnJ[num]Pass"""Add to Cart"""defAddshoppingcart (money,number):GlobalBalance Librys= []    ifMoney >= Commodity (1, Commoditylibray, number): Balance= Money-commodity (1, Commoditylibray, number) Librys.append (Commodity (0, Commoditylibray, number)) Librys.append (Commodity (1, Commoditylibray, number)) Shoppingcart.append (Librys)Print("added to Cart!!")    Else:        Print("Insufficient balance !")    Pass"""judge whether the wages can buy the goods, can add to the shopping cart"""defShopping (wages,number):ifBalance = =-1: Addshoppingcart (Wages, number)Else: Addshoppingcart (balance, number)Pass"""Print List Listing"""defPrintlibray (libray):ifLen (libray)! =0:str=""         forI, JinchEnumerate (libray): Str= STR (i + 1) +","             forN, binchEnumerate (j): Str+ = str (b) +"  "            Print(STR)Pass"""when you exit, print the purchased items"""defprintpurchase (strinput):ifStrinput = ="N":        ifLen (shoppingcart) = =0:exit ()Else:            Print("The purchased list is as follows:") Printlibray (ShoppingCart)Print("remaining balance:"+str (balance)) exit ()PassWages= Input ("Please enter salary (n exit):") printpurchase (Wages)ifAbnormal (Wages):ifInt (Wages) <=0:Print("wages must not be less than 0") exit ()Else:    Print("wages are illegal !") whileIswhile:printlibray (commoditylibray) Commoditynumber= Input ("Please select a product number (n exit):") printpurchase (commoditynumber)ifAbnormal (commoditynumber):ifInt (commoditynumber) >0 andInt (commoditynumber) <int (len (commoditylibray) +1) :            ifBalance = =-1: Shopping (int (Wages), int (commoditynumber)-1)            Else: Shopping (balance, int (commoditynumber)-1)            Continue        Else:            Print("the number must be in 0~~"+str (Len (commoditylibray) +1) +"between !!")            Continue    Else:        Print("number is not legal !")        ContinueIswhile=false

Novice small white Python road Day4 (shopping cart applet)