有备案域名买卖

class DomainSaleContract:
    def __init__(self, domain_name, seller, buyer, price):
        self.domain_name = domain_name
        self.seller = seller
        self.buyer = buyer
        self.price = price
        self.status = "Pending"

    def confirm_sale(self):
        if self.status == "Pending":
            self.status = "Confirmed"
            print(f"Domain {self.domain_name} has been sold to {self.buyer} for {self.price}.")
        else:
            print("Sale already confirmed.")

    def cancel_sale(self):
        if self.status == "Pending":
            self.status = "Cancelled"
            print(f"Sale of domain {self.domain_name} has been cancelled.")
        else:
            print("Sale cannot be cancelled.")

# 示例使用
contract = DomainSaleContract("example.com", "Seller A", "Buyer B", 1000)
contract.confirm_sale()
contract.cancel_sale()