Probleme beim Aktualisieren der TXT-Datei im Inventarprogramm

Question

Ich erstelle ein Rechnungsprogramm, mit dem der Benutzer einen Artikel aus einem Menü mit Produkten auswählen kann, um ihn entweder zu kaufen oder zurückzugeben. Sobald der Benutzer die gewünschte Artikel-ID und Menge eingegeben hat, liest das Programm die Datei inventory.txt und schreibt eine Datei "UpdatedInventory.txt", die die Datei inventory.txt ersetzt. Die inventory.txt Datei wird wie folgt formatiert:

ID 
item 
stock 
price 

Wenn mein Programm läuft, es druckt nicht korrekt auf der UpdatedInventory.txt Datei. Es gibt eine Menge Code hier so leer mit mir.

Abgesehen davon, ich fühle mich wie es würde den Code zu vereinfachen, wenn jeder Kauf der Benutzer wurde in einer Liste statt hart codierten hinzugefügt. Danke für die Hilfe!

Hier ist mein Haupt-Code:

import InventoryFile 
import os 

def readFile(): 
    #open the file and read the lines 
    inventoryFile = open ('Inventory.txt', 'r') 
    raw_data = inventoryFile.readlines() 

    #remove the new line characters 
    clean_data = [] 
    for item in raw_data: 
     clean_item = item.rstrip ('\n') 
     clean_data.append (clean_item) 

    #read lists into objects 
    all_objects = [] 
    for i in range (0, len(clean_data), 4): 
     ID = clean_data [i] 
     item = clean_data [i+1] 
     qty = float (clean_data [i+2]) 
     price = float (clean_data [i+3]) 

     #create inventory object 
     inventory_object = InventoryFile.Inventory (ID, item, qty, price) 
     all_objects.append (inventory_object) 

    return all_objects 

def printMenu (all_data): 
    print() 
    print ('Select an item ID to purchase or return: ') 
    print() 
    print ('ID\tItem\t\t Quantity\t Price') 

    for item in all_data: 
     print (item) 

    print() 

    print ('Enter another item ID or 0 to stop') 

def modify(): 
    found = False 

    search = -1 
    while search == -1: 
     search = input ('Enter the ID of the product you would like to purchase: ') 

     try: 
      if search == '0': 
       print ('The inventory has been updated...') 
       break 

     except Exception: 
      search = -1 
      print ('ERROR: Please enter a valid number.') 

     else: 
      inventoryFile = open ('inventory.txt', 'r') 

      temp_file = open ('UpdatedInventory.txt', 'w') 

      ID = str (inventoryFile.readline()) 

      while ID != '': 
       item = str (inventoryFile.readline()) 
       qty = float (inventoryFile.readline()) 
       price = float (inventoryFile.readline()) 

       inventory_object = InventoryFile.Inventory (ID, item, qty, price) 

       ID = ID.rstrip ('\n') 

       if ID == search: 
        purchase = -1 
        while purchase == -1: 
         purchaseEntry = float (input ('How many would you like to purchase? Negative numbers are returns')) 
         purchase = inventory_object.purchase (purchaseEntry) 
         if purchase is False: 
          purchase = -1 
          print ('ERROR: Insufficient stock!') 

        new_qty = inventory_object.restock (purchase) 

        transaction_object = InventoryFile.TransactionItem (ID, item, new_qty, price) 

        transaction_object.set_id (ID) 
        transaction_object.set_name (item) 
        transaction_object.set_qty (new_qty) 
        transaction_object.set_price (price) 

        ID = transaction_object.get_id() 
        item = transaction_object.get_name() 
        qty = transaction_object.get_qty() 
        price = transaction_object.get_price() 

        temp_file.write (ID + '\n') 
        temp_file.write (item + '\n') 
        temp_file.write (str (qty) + '\n') 
        temp_file.write (str (price) + '\n') 

        found = True 

       else: 
        temp_file.write (ID + '\n') 
        temp_file.write (item + '\n') 
        temp_file.write (str (new_qty) + '\n') 
        temp_file.write (str (price) + '\n') 

       ID = inventoryFile.readline() 

      if found: 
       print ('The file has been updated.') 
      else: 
       print ('That item was not found in the file.') 

       inventoryFile.close() 
       temp_file.close() 

       os.remove ('inventory.txt') 

       os.rename ('UpdatedInventory.txt', 'inventory.txt') 

       print ('Inventory has been updated.') 
       break 

    return search 

def main(): 
    all_items = readFile() 
    printMenu (all_items) 
    modify() 


main() 

Hier ist mein Inventar Klassendatei:

class Inventory(): 
    def __init__ (self, new_id, new_name, new_stock, new_price): 
     self.__id = new_id 
     self.__name = new_name 
     self.__stock = new_stock 
     self.__price = new_price 

    def get_id (self): 
     return self.__id 
    def get_name (self): 
     return self.__name 
    def get_stock (self): 
     return self.__stock 
    def get_price (self): 
     return self.__price 

    def restock (self, new_stock): 
     if new_stock < 0: 
      print ('ERROR') 
      return False 
     else: 
      self.__stock += new_stock 
      return True 

    def purchase (self, purch_qty): 
     if self.__stock >= purch_qty: 
      self.__stock -= purch_qty 
      return self.__stock 
     else: 
      print ('ERROR: Insufficient stock') 
      return False 

    def __str__ (self): 
     return self.__id + '\t' + self.__name + '\t' + \ 
     format (self.__stock, '7.2f') + format (self.__price, '7.2f') 

class TransactionItem (Inventory): 
    def __init__ (self, new_id, new_name, new_qty, new_price): 
     self.__qty = new_qty 
     Inventory.__init__(self, new_id, new_name, new_qty, new_price) 

    def get_id (self): 
     return self.__id 
    def set_id (self, new_id): 
     self.__id = new_id 
    def get_name (self): 
     return self.__name 
    def set_name (self, new_name): 
     self.__name = new_name 
    def get_qty (self): 
     return self.__qty 
    def set_qty (self, new_qty): 
     self.__qty = new_qty 
    def get_price (self): 
     return self.__price 
    def set_price (self, new_price): 
     self.__price = new_price 

    def calc_cost (self): 
     total = purch_qty * self.__price 

    def __str__ (self): 
     return self.__id + '\t' + self.__name + '\t' + \ 
     format (self.__qty, '7.2f') + format (self.__price, '7.2f') + \ 
     format (total, '7.2f') 

Hier ist meine inventory.txt Datei:

244 
Large Cake Pan 
7 
19.99 
576 
Assorted Sprinkles 
3 
12.89 
212 
Deluxe Icing Set 
6 
37.97 
827 
Yellow Cake Mix 
3 
1.99 
194 
Cupcake Display Board 
2 
27.99 
285 
Bakery Boxes 
7 
8.59 
736 
Mixer 
5 
136.94 

Und hier ist es, was die aktualisierte Inventar txt sieht aus, nachdem ich Produkt-ID 244 eingegeben habe, und Kaufmenge von 5.

244 
Large Cake Pan 

4.0 
19.99 
576 
Assorted Sprinkles 

4.0 
12.89 
212 
Deluxe Icing Set 

4.0 
37.97 
827 
Yellow Cake Mix 

4.0 
1.99 
194 
Cupcake Display Board 

4.0 
27.99 
285 
Bakery Boxes 

4.0 
8.59 
736 
Mixer 

4.0 
136.94 

Answer 1

ich deaktiviert TransactionItem habe. Dies scheint zu funktionieren (Ich habe die Skriptdateien kombiniert):

import os 


class Inventory(): 

    def __init__(self, new_id, new_name, new_stock, new_price): 
     self.__id = new_id 
     self.__name = new_name 
     self.__stock = new_stock 
     self.__price = new_price 

    def get_id(self): 
     return self.__id 

    def get_name(self): 
     return self.__name 

    def get_stock(self): 
     return self.__stock 

    def get_price(self): 
     return self.__price 

    def restock(self, new_stock): 
     if new_stock < 0: 
      print('ERROR') 
      return False 
     else: 
      self.__stock += new_stock 
      return True 

    def purchase(self, purch_qty): 
     if self.__stock >= purch_qty: 
      self.__stock -= purch_qty 
      return self.__stock 
     else: 
      print('ERROR: Insufficient stock') 
      return False 

    def __str__(self): 
     return self.__id + '\t' + self.__name + '\t' + \ 
      format(self.__stock, '7.2f') + format(self.__price, '7.2f') 


class TransactionItem (Inventory): 

    def __init__(self, new_id, new_name, new_qty, new_price): 
     self.__qty = new_qty 
     Inventory.__init__(self, new_id, new_name, new_qty, new_price) 

    def get_id(self): 
     return self.__id 

    def set_id(self, new_id): 
     self.__id = new_id 

    def get_name(self): 
     return self.__name 

    def set_name(self, new_name): 
     self.__name = new_name 

    def get_qty(self): 
     return self.__qty 

    def set_qty(self, new_qty): 
     self.__qty = new_qty 

    def get_price(self): 
     return self.__price 

    def set_price(self, new_price): 
     self.__price = new_price 

    def calc_cost(self): 
     self.total = purch_qty * self.__price 

    def __str__(self): 
     return self.__id + '\t' + self.__name + '\t' + \ 
      format (self.__qty, '7.2f') + format (self.__price, '7.2f') + \ 
      format(self.total, '7.2f') 


def readFile(): 
    # open the file and read the lines 
    inventoryFile = open('Inventory.txt', 'r') 
    raw_data = inventoryFile.readlines() 

    # remove the new line characters 
    clean_data = [] 
    for item in raw_data: 
     clean_item = item.rstrip('\n') 
     clean_data.append(clean_item) 

    # read lists into objects 
    all_objects = [] 
    for i in range(0, len(clean_data), 4): 
     ID = clean_data[i] 
     item = clean_data[i + 1] 
     qty = float(clean_data[i + 2]) 
     price = float(clean_data[i + 3]) 

     # create inventory object 
     inventory_object = Inventory(ID, item, qty, price) 
     all_objects.append(inventory_object) 

    return all_objects 


def printMenu(all_data): 
    print() 
    print('Select an item ID to purchase or return: ') 
    print() 
    print('ID\tItem\t\t Quantity\t Price') 

    for item in all_data: 
     print(item) 

    print() 

    print('Enter another item ID or 0 to stop') 


def modify(): 
    found = False 

    search = -1 
    while search == -1: 
     search = input(
      'Enter the ID of the product you would like to purchase: ') 

     try: 
      if search == '0': 
       print('The inventory has been updated...') 
       break 

     except Exception: 
      search = -1 
      print('ERROR: Please enter a valid number.') 

     else: 
      inventoryFile = open('inventory.txt', 'r') 

      temp_file = open('UpdatedInventory.txt', 'w') 

      ID = str(inventoryFile.readline()) 

      while ID != '': 
       item = str(inventoryFile.readline()) 
       qty = float(inventoryFile.readline()) 
       price = float(inventoryFile.readline()) 

       inventory_object = Inventory(ID, item, qty, price) 

       ID = ID.rstrip('\n') 
       item = item.rstrip('\n') 

       if ID == search: 
        purchase = -1 
        while purchase == -1: 
         purchaseEntry = float(
          input('How many would you like to purchase? Negative numbers are returns')) 
         purchase = inventory_object.purchase(purchaseEntry) 
         if purchase is False: 
          purchase = -1 
          print('ERROR: Insufficient stock!') 

        #new_qty = inventory_object.restock(purchase) 

        #transaction_object = TransactionItem(
        # ID, item, new_qty, price) 

        #transaction_object.set_id(ID) 
        #transaction_object.set_name(item) 
        #transaction_object.set_qty(new_qty) 
        #transaction_object.set_price(price) 

        #ID = transaction_object.get_id() 
        #item = transaction_object.get_name() 
        #qty = transaction_object.get_qty() 
        #price = transaction_object.get_price() 

        qty = inventory_object.get_stock() 
        price = inventory_object.get_price() 

        temp_file.write(ID + '\n') 
        temp_file.write(item + '\n') 
        temp_file.write(str(int(qty)) + '\n') 
        temp_file.write(str(price) + '\n') 

        found = True 

       else: 
        temp_file.write(ID + '\n') 
        temp_file.write(item + '\n') 
        temp_file.write(str(int(qty)) + '\n') 
        temp_file.write(str(price) + '\n') 

       ID = inventoryFile.readline() 

      if found: 
       print('The file has been updated.') 
      else: 
       print('That item was not found in the file.') 

       inventoryFile.close() 
       temp_file.close() 

       os.remove('inventory.txt') 

       os.rename('UpdatedInventory.txt', 'inventory.txt') 

       print('Inventory has been updated.') 
       break 

    return search 


def main(): 
    all_items = readFile() 
    printMenu(all_items) 
    modify() 


main() 

Ich hoffe, es hilft!

Answer 2

Haben Sie versucht, durch das Programm zu gehen? https://docs.python.org/2/library/pdb.html oder https://docs.python.org/3/library/pdb.html

irgendwann Sie Informationen zu verlieren sind

(es ist schwer, dass große Code-Block zu beheben leider)