code: def update_field_names(self, data, matching):
          
  
          for key in matching.keys():
              if key in data.columns:
                  data.rename(columns={key:matching[key]})
  
          return data
docs: This method updates the names of the fields according to matching
  
          :param data: original Pandas dataframe
          :param matching: dictionary of matchings between old and new values
          :type data: pandas.DataFrame
          :type matching: dictionary
  
          :returns: Pandas dataframe with updated names
          :rtype: pandas.DataFrame