df.fillna(0) command won't replace NaN values with 0

Question

I\'m trying to replace the NaN values generated in the code below to 0. I don\'t understand what the below won\'t work. It still keeps the NaN values.

df_pub         


        

Answer 1

You need to assign the result of fillna:

df_pubs = df_pubs.fillna(0)

or pass param inplace=True:

df_pubs.fillna(0, inplace=True)

See the docs

You could modify your code to this:

df_pubs = df_pubs.pivot(index='Conference', columns='Year', values='totalPubs').fillna(0)

which would work but it's debatable whether the fillna is readable here.