Traceback (most recent call last): File "/home/Store.py", line 116, in Store.main() ~~~~~~~~~~^^ File "/home/Store.py", line 16, in main store = Store() File "/home/Store.py", line 6, in __init__ Product("Whiteboard Marker", 85, 1.50), ^^^^^^^ NameError: name 'Product' is not defined Store.py class Store: def __init__(self): # Insert 6 lines of code to initialise the fields self.products = [ Product("Whiteboard Marker", 85, 1.50), Product("Whiteboard Eraser", 45, 5.00), Product("Black Pen", 100, 1.50), Product("Red Pen", 100, 1.50), Product("Blue Pen", 100, 1.50) ] self.cash_register = CashRegister() @staticmethod def main(): store = Store() store.menu() def menu(self): choice = '' while choice != 'x': choice = self.read_choice() if choice == 's': self.sell() elif choice == 'r': self.restock() elif choice == 'v': self.view_stock() elif choice == 'c': self.view_cash() elif choice == 'p': self.prune_products() else: self.help() print("Done") def read_choice(self): choice = input("Choice (s/r/v/c/p/x): ") return choice def sell(self): name = self.read_name().lower() count = 0 i = 0 for product in self.products: if product.get_name().lower() == name: print(f"Selling {product.get_name()}") n = self.read_number() total = product.sell(n) self.cash_register.add(total) elif name in product.get_name().lower(): if i == 0: print("Multiple products match:") print(product) i += 1 else: count += 1 if count == len(self.products): print("No such product") def restock(self): name = self.read_name() count = 0 i = 0 for product in self.products: if name.lower() in product.get_name().lower(): print(f"Restocking {product.get_name()}") n = self.read_number() product.restock(n) else: count += 1 if count == len(self.products): print("Adding new product") stock = self.read_number() price = self.read_price() self.products.append(Product(name, stock, price)) def view_stock(self): for product in self.products: print(product) def view_cash(self): print(self.cash_register) def empty(self, products): matches = [] for product in products: if product.is_empty(): matches.append(product) return matches def prune_products(self): empty_products = self.empty(self.products) self.products = [product for product in self.products if product not in empty_products] def read_name(self): return input("Name: ") def read_price(self): return float(input("Price: $")) def read_number(self): return int(input("Number: ")) def help(self): print("Menu options") print("s = sell") print("r = restock") print("v = view stock") print("c = view cash") print("p = prune products") print("x = exit") if __name__ == "__main__": Store.main() Product.py class Product: def __init__(self, product_name, initial_stock, product_price): # insert 3 lines of code to initialise the fields. self.name = product_name self.stock = initial_stock self.price = product_price def get_name(self): return self.name def is_empty(self): if self.stock == 0: return True else: return False # Return true iff this product has at least n stock def has(self, quantity): return self.stock >= quantity # Sell n stock of this product (decrease stock by n) # and return the amount of money earned (price * n) def sell(self, quantity): if quantity <= self.stock: self.stock -= quantity else: print("Not enough stock") total = quantity * self.price return total # Increase stock by n def restock(self, quantity): self.stock += quantity def __str__(self): return f"{self.name} - {self.stock} at ${self.formatted(self.price)}" def formatted(self, money): return f"{money:.2f}" CashRegister.py class CashRegister: def __init__(self): self.cash = 0.0 def add(self, money): self.cash += money def __str__(self): return "Cash: $" + self.formatted(self.cash) def formatted(self, amount): return "{:,.2f}".format(amount)