如何在单元测试中检查值是否为nan? [英] How to check if value is nan in unittest?

问题描述

我有一些函数，有时会返回float('nan')的NaN(我不使用numpy).

I've got functions, which sometimes return NaNs with float('nan') (I'm not using numpy).

既然如此，我该如何为它编写测试

How do I write a test for it, since

assertEqual(nan_value, float('nan'))

就像float('nan') == float('nan')始终为假.可能有类似assertIsNan的东西吗?我什么都找不到……

is just like float('nan') == float('nan') always false. Is there maybe something like assertIsNan? I could not find anything about it…

推荐答案

我想到了

assertTrue(math.isnan(nan_value))

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