docs: def update_config(self):
          """
          Update the configuration files according to the current
          in-memory SExtractor configuration.
          """
  
          # -- Write filter configuration file
  
          # First check the filter itself
  
          filter = self.config['FILTER_MASK']
          rows = len(filter)
          cols = len(filter[0])   # May raise ValueError, OK
  
          filter_f = __builtin__.open(self.config['FILTER_NAME'], 'w')
          filter_f.write("CONV NORM\n")
          filter_f.write("# %dx%d Generated from sextractor.py module.\n" %
                         (rows, cols))
          for row in filter:
              filter_f.write(" ".join(map(repr, row)))
              filter_f.write("\n")
  
          filter_f.close()
  
          # -- Write parameter list file
  
          parameters_f = __builtin__.open(self.config['PARAMETERS_NAME'], 'w')
          for parameter in self.config['PARAMETERS_LIST']:
              print(parameter, file=parameters_f)
  
          parameters_f.close()
  
          # -- Write NNW configuration file
  
          nnw_f = __builtin__.open(self.config['STARNNW_NAME'], 'w')
          nnw_f.write(nnw_config)
          nnw_f.close()
  
          # -- Write main configuration file
  
          main_f = __builtin__.open(self.config['CONFIG_FILE'], 'w')
  
          for key in self.config.keys():
              if (key in SExtractor._SE_config_special_keys):
                  continue
  
              if (key == "PHOT_AUTOPARAMS"):  # tuple instead of a single value
                  value = " ".join(map(str, self.config[key]))
              else:
                  value = str(self.config[key])
  
              print(("%-16s       %-16s # %s" % (key, value, SExtractor._SE_config[key]['comment'])), file=main_f)
  
          main_f.close()