查找并用数字替换"nan" [英] finding and replacing 'nan' with a number

问题描述

我想替换数字3而不是数组中的所有"nan".这是我的代码:

I want to replace number 3 instead of all 'nan' in array. this is my code:

train= train.replace("nan",int(3))

但是我的数组没有任何变化.你能指导我吗?

But nothing changes in my array. Could u please guide me?

推荐答案

>>> import math
>>> train = [10, float('NaN'), 20, float('NaN'), 30]
>>> train = [3 if math.isnan(x) else x for x in train]
>>> train
[10, 3, 20, 3, 30]

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