存货融资价钱

class InventoryManagement:
    def __init__(self):
        self.inventory = {}

    def add_item(self, item_name, quantity, value):
        if item_name in self.inventory:
            self.inventory[item_name]['quantity'] += quantity
        else:
            self.inventory[item_name] = {'quantity': quantity, 'value': value}

    def remove_item(self, item_name, quantity):
        if item_name in self.inventory and self.inventory[item_name]['quantity'] >= quantity:
            self.inventory[item_name]['quantity'] -= quantity
            if self.inventory[item_name]['quantity'] == 0:
                del self.inventory[item_name]
        else:
            print("Not enough stock")

    def get_inventory_value(self):
        total_value = 0
        for item in self.inventory.values():
            total_value += item['quantity'] * item['value']
        return total_value

# 示例使用
inventory_manager = InventoryManagement()
inventory_manager.add_item('Laptop', 10, 1000)
inventory_manager.add_item('Smartphone', 20, 500)
print("Total inventory value:", inventory_manager.get_inventory_value())