How is the missing_values function working?

[TrinaDutta95]

Once I apply that on the dataframe_hrv, it is making that as an NoneType object. Does anyone know how to fix that issue?

[KryeKuzhinieri]

All you have to do is replace this line
df=df.fillna(df.mean(),inplace=True)

With this one
df = df.fillna(df.mean())

Or this line
df.fillna(df.mean(),inplace=True)

This was reported in the previous issue too.
#1