code: def get_all():
      
  
      _import_all_importer_files()
  
      for module in (value for key, value in globals().items()
                     if key in __all__):
          for klass_name, klass in inspect.getmembers(module, inspect.isclass):
              if klass is not BaseImporter and issubclass(klass, BaseImporter):
                  yield klass
  
      for klass in _get_importers_from_entry_points():
          yield klass
docs: Get all subclasses of BaseImporter from module and return and generator