直播剪辑代金卷

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

    def is_valid(self, current_date):
        return current_date <= self.expiry_date

def apply_voucher(order_total, voucher):
    if voucher.is_valid(datetime.now()):
        discounted_total = order_total - voucher.amount
        if discounted_total < 0:
            return 0
        return discounted_total
    else:
        return order_total

# 示例使用
from datetime import datetime

voucher = Voucher(code="SAVE20", amount=20, expiry_date=datetime(2023, 12, 31))
order_total = 100

final_amount = apply_voucher(order_total, voucher)
print(f"Final amount after applying voucher: {final_amount}")