Python中怎麼判斷一個浮點數是NaN

嘗試瞭如下幾種方法，都沒有成功：ast >>> a = float('NaN') module >>> a == 'NaN' False >>> a == nan          False >>> a == float('NaN') False >>> isNaN(a) Traceback (most recent call last):   File "<stdin>", line 1, i

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