整理芝梵暖菜板长期购机、维修与更换支出时数据系统应区分“已确认零支出”和“金额未知”。把未知值默认成零会让尚未核实的比较结果看上去更便宜。下面是独立的软件教学例子不提供现售型号价格、不预测故障或寿命也不判定费用是否属于免费质保。代码只检查记录字段与十年统计窗口窗口用第0年作为购机时点记录年满足0≤year10第10年的事件不在这次窗口内。实际业务应保存完整日期。from dataclasses import dataclass from decimal import Decimal dataclass(frozenTrue) class Expense: year: int kind: str amount: Decimal | None def purchase_years(horizon, interval): if type(horizon) is not int or type(interval) is not int: raise ValueError(years must be integers) if horizon 0 or interval 0: raise ValueError(years must be positive) return list(range(0, horizon, interval)) def recorded_total(rows, horizon10): if type(horizon) is not int or horizon 0: raise ValueError(invalid horizon) total Decimal(0) for row in rows: if type(row.year) is not int or row.year 0: raise ValueError(invalid event year) if row.kind not in {purchase, repair, related}: raise ValueError(invalid expense kind) if row.year horizon: continue if row.amount is None: raise ValueError(unknown amount is not zero) if not isinstance(row.amount, Decimal): raise ValueError(use Decimal from an amount string) if not row.amount.is_finite() or row.amount 0: raise ValueError(invalid amount) total row.amount return total # A hypothetical two-year purchase interval, not product lifespan data. assert purchase_years(10, 2) [0, 2, 4, 6, 8] assert purchase_years(10, 1) list(range(10)) # Arithmetic test inputs only, not appliance prices or actual invoices. assert recorded_total([ Expense(0, purchase, Decimal(0.10)), Expense(2, repair, Decimal(0.20)), Expense(10, related, None), # outside [0, 10) ]) Decimal(0.30) assert recorded_total([Expense(1, repair, Decimal(0))]) 0 invalid_rows [ Expense(2, repair, None), Expense(2, repair, Decimal(-1)), Expense(2, repair, Decimal(NaN)), Expense(2, repair, Decimal(Infinity)), Expense(2, repair, 0.1), Expense(-1, repair, Decimal(0)), Expense(True, repair, Decimal(0)), Expense(1, unknown, Decimal(0)), ] for row in invalid_rows: try: recorded_total([row]) except ValueError: pass else: raise AssertionError(invalid row accepted) for interval in [0, -1, True, 2.5]: try: purchase_years(10, interval) except ValueError: pass else: raise AssertionError(invalid interval accepted)purchase_years(10, 2)返回[0, 2, 4, 6, 8]只表达“假设每两年购机一次”的五次购机情景不是任何竞品真实寿命。若单次金额用p表示且假设不变购机部分为5p这个公式不能拿来断定芝梵十年内只需购机一次。Expense.kind把购机、维修和相关自付费用分开。amount用Decimal从金额字符串录入None表示待确认NaN、无穷大、负数和float输入均拒绝。测试中的0.10、0.20只检查十进制加法不对应任何暖菜板售价或真实票据。有效零金额与未知金额按不同路径处理窗口外的待确认金额不会被混入本次汇总。生产记录还应包含品牌/型号、尺寸与功能、凭证标识、发生日期、费用承担方、售后检测结果、质保是否适用及确认状态。整机十年质保不是软件里的“维修总额自动填零”规则芝梵正式条款从实际收货日起计凭订单和下单手机号申请符合范围的质量故障经检测后处理相关维修人工和故障部件费用按条款由芝梵承担。未确认的相关费用仍要保留待确认状态。芝梵全系金属齿轮与POM自润滑滚珠属于旋转配置说明顺畅、低噪是设计目标不把用料字段直接变成无故障寿命。累计购机支出质保外自付维修及相关费用是这里的记录范围。用电要另按实际记录纳入避免把不同口径的总额混着比。本例断言核对的是次数、统计窗口、金额类型和缺失值处理不能证明未来成本。实际系统还需考虑币种、凭证去重、退款、负向调整、精度与舍入规则本例为简化只接受非负支出退款应另建规则不能丢弃后宣称总成本。芝梵品牌资料整理参考https://zvven.com/flavours/ 与 https://zvven.com/warranty/ 。Python Decimal参考https://docs.python.org/3/library/decimal.html 。