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我有两个列表：total_price和units_b，它们都包含空值，并且我有一个表达式来将 total_price 除以 units_b：

    total_price = [None, None, 10, 20]
    units_b = [None, None, 1, 2]

    average_price = [(x/y) for x, y in zip(total_price, units_b)]

试图运行average_price给我一个错误，说我不能划分两个“NoneTypes”。有什么方法可以排除除法的空值但保持原始列表的完整性？

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3 回答 3

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average_price = [(x/y) for x, y in zip(total_price, units_b) if x is not None and y is not None]
于 2012-10-05T00:33:57.093 回答
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total_price = [None, None, 10, 20]
units_b = [None, None, 1, 2]

average_price = [(x/y) for x, y in zip(total_price, units_b) if x is not None and y is not None]
于 2012-10-05T00:34:01.870 回答
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average_price = [(x/y) for x, y in zip(total_price, units_b) if not (x==None or y==None)]

虽然你真的应该阅读文档

于 2012-10-05T00:34:04.257 回答