Python Shopping Cart Merchant part code

Knowledge Points: File write operations, functions, function recursion

#！ C:\Program files\python35/bin#-*-conding:utf-8-*-# author:frank# definition Product List product_list = {' Pen ': 2.5, ' NoteBook ': 3. 3, ' eraser ': 1.0}MESG = ' 1.Change goods ' price2. ADD new Goods3.quitplese input which do want: "Def print_list (): For key in Product_list:print (key, Produ Ct_list[key]) def change_price (): name = input ("Please input the goods name:") if name in PRODUCT_LIST:NEW_PR  Ice = input ("Please input new price:") product_list[name] = New_price print ("\033[31;0m[%s]\033[0m been change to \033[32;0m%s\033[1m "% (name, new_price)) print_list () Else:ok = input (" The goods not in P Roduct list, do you want to add: ") if OK in (' Y ', ' ye ', ' yes '): Add_goods () If OK in (' n ', ' no ', ' non E '): Exit (Record_to_text ()) def add_goods (): name = input ("Please input the Add goods name:") if name in P Roduct_list:print ("The goods had exist, please re_input:") add_goods () ElsE:price = input ("Please input the goods price:") product_list[name] = Price print ("Add \033[31;0m[%s ]\033[1m to list already "% name" Print_list () def record_to_text (): With open ("Product", ' w+ ', encoding= ' utf-8 ') As F:for goods in Product_list:print (Goods,product_list[goods], file=f) print_list () while True:user         _input = input (MESG) if user_input = = ' 1 ': Change_price () elif user_input = ' 2 ': Add_goods () Else: User_input = = ' 3 ' Print ("Your current produce list as below:") Print_list () exit (Record_to_te XT ())

Test:

NoteBook 3.3eraser 1.0Pen 2.51.Change goods ' Price2.  Add new Goods3.quitplese input which do want:p lease input the Add goods name:appleplease input the goods price:5.0add [Apple] into list alreadyapple 5.0NoteBook 3.3eraser 1.0Pen 2.51.Change goods ' Price2.  ADD new Goods3.quitplese input which do want:p lease input the goods name:penplease input new Price:2.3[pen] price have been change to 2.3Apple 5.0NoteBook 3.3eraser 1.0Pen 2.31.Change goods ' Price2. ADD new Goods3.quitplese input which do want:p lease input the goods name:bookthe goods not in the product list, does you WA NT to Add:no