How to drop column according to NAN percentage for dataframe?

Question

For certain columns of df, if 80% of the column is NAN.

What\'s the simplest code to drop such columns?

Answer 1

df.dropna(thresh=np.int((100-percent_NA_cols_required)*(len(df.columns)/100)),inplace=True)

Basically pd.dropna takes number(int) of non_na cols required if that row is to be removed.