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class InventorySystem: def __init__(self): self.inventory = {} def add_item(self, item_name, quantity): if item_name in self.inventory: self.inventory[item_name] += quantity else: self.inventory[item_name] = quantity def view_inventory(self): print("Inventory:") for item, quantity in self.inventory.items(): print(f"{item}: {quantity}") def main(): inventory_system = InventorySystem() while True: print("\nOptions:") print("1. Add item to inventory") print("2. View inventory") print("3. Exit") choice = input("Enter your choice: ") if choice == '1': item_name = input("Enter item name: ") quantity = int(input("Enter quantity: ")) inventory_system.add_item(item_name, quantity) elif choice == '2': inventory_system.view_inventory() elif choice == '3': break else: print("Invalid choice. Please try again.") if __name__ == "__main__": main()