How to count the NaN values in a column in pandas DataFrame

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I have data, in which I want to find number of NaN, so that if it is less than some threshold, I will drop this columns. I looked, but didn't able to find any function for this. There is value_counts, but it would be slow for me, because most of values are distinct and I want count of NaN only.
Jun 15, 2020 in Python by kartik
• 37,510 points
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1 answer to this question.

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Hello @kartik,

Lets assume df is a pandas DataFrame.

Then,

df.isnull().sum(axis = 0)

This will give number of NaN values in every column.

If you need, NaN values in every row,

df.isnull().sum(axis = 1)

Hope this is helpful!!

answered Jun 15, 2020 by Niroj
• 82,720 points

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