code: def get_weekday_parameters(self, filename='shlp_weekday_factors.csv'):
          
          file = os.path.join(self.datapath, filename)
          f_df = pd.read_csv(file, index_col=0)
  
          tmp_df = f_df.query('shlp_type=="{0}"'.format(self.shlp_type)).drop(
              'shlp_type', axis=1)
  
          tmp_df['weekdays'] = np.array(list(range(7))) + 1
  
          return np.array(list(map(float, pd.DataFrame.merge(
              tmp_df, self.df, left_on='weekdays', right_on='weekday',
              how='inner', left_index=True).sort_index()['wochentagsfaktor'])))
docs: Retrieve the weekday parameter from csv-file
  
          Parameters
          ----------
          filename : string
              name of file where sigmoid factors are stored