15 lines
610 B
Python
15 lines
610 B
Python
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"""含税单位指导成本到总成本的唯一换算，不改写已封存的成本快照。"""
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from decimal import ROUND_HALF_UP, Decimal
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def guided_total(quantity, guided_price, cost_amount=None):
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if guided_price is None:
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return Decimal(str(cost_amount)) if cost_amount is not None else None
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total = (Decimal(str(quantity)) * Decimal(str(guided_price))).quantize(
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Decimal("0.01"), rounding=ROUND_HALF_UP
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)
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if cost_amount is not None and Decimal(str(cost_amount)) != total:
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raise ValueError("成本额与数量×含税单位指导成本不一致")
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return total
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