def _load_lexers(module_name):
 mod = __import__(module_name, None, None, ['__all__'])
 for lexer_name in mod.__all__:
  cls = getattr(mod, lexer_name)
  _lexer_cache[cls.name] = cls

def _load_lexers ( module_name ) : mod = __import__ ( module_name , None , None , [ '__all__' ] ) for lexer_name in mod . __all__ : cls = getattr ( mod , lexer_name ) _lexer_cache [ cls . name ] = cls
load a lexer .