code: def fetch_presences(data_dir, deputies, date_start, date_end):
      
      presences = PresencesDataset()
      df = presences.fetch(deputies, date_start, date_end)
      save_to_csv(df, data_dir, "presences")
  
      log.info("Presence records:", len(df))
      log.info("Records of deputies present on a session:", len(df[df.presence == 'Present']))
      log.info("Records of deputies absent from a session:", len(df[df.presence == 'Absent']))
  
      return df
docs: :param data_dir: (str) directory in which the output file will be saved
      :param deputies: (pandas.DataFrame) a dataframe with deputies data
      :param date_start: (str) a date in the format dd/mm/yyyy
      :param date_end: (str) a date in the format dd/mm/yyyy