def exercise4(df): df1 = df.select_dtypes(np.number) df2 = df.select_dtypes(exclude = 'float') mode = df2.mode() df3 = df1.fillna(df.mean()) df4 = df2.fillna(mode.iloc[0,:]) new_df = [df3,df4] df5 = pd.concat(new_df,axis=1) new_cols = list(df.columns) df6 = df5[new_cols] return df6