def _append_to_conf_paths(option, opt_str, value, parser):
 _default_to(parser, 'conf_paths', [])
 if (value not in parser.values.conf_paths):
  parser.values.conf_paths.append(value)

def _append_to_conf_paths ( option , opt_str , value , parser ) : _default_to ( parser , 'conf_paths' , [ ] ) if ( value not in parser . values . conf_paths ) : parser . values . conf_paths . append ( value )
conf_paths is none by default .