凭据管理系统代金卷

import datetime

class Voucher:
    def __init__(self, code, amount, valid_until):
        self.code = code
        self.amount = amount
        self.valid_until = valid_until

    def is_valid(self):
        return datetime.datetime.now() < self.valid_until

class VoucherSystem:
    def __init__(self):
        self.vouchers = {}

    def create_voucher(self, code, amount, valid_days):
        valid_until = datetime.datetime.now() + datetime.timedelta(days=valid_days)
        voucher = Voucher(code, amount, valid_until)
        self.vouchers[code] = voucher
        return voucher

    def use_voucher(self, code):
        if code in self.vouchers:
            voucher = self.vouchers[code]
            if voucher.is_valid():
                print(f"Voucher {code} used successfully. Amount: {voucher.amount}")
                del self.vouchers[code]
            else:
                print("Voucher has expired.")
        else:
            print("Invalid voucher code.")

# 示例使用
system = VoucherSystem()
system.create_voucher("SAVE10", 10, 30)  # 创建一个有效期为30天的10元代金券
system.use_voucher("SAVE10")  # 使用代金券