code: def _register(abstract_cls, *classes):
      for cls in classes:
          abstract_cls.register(cls)
          if _frozen_importlib is not None:
              try:
                  frozen_cls = getattr(_frozen_importlib, cls.__name__)
              except AttributeError:
                  frozen_cls = getattr(
                      _frozen_importlib_external, cls.__name__
                  )
              abstract_cls.register(frozen_cls)
  
imports: from .None import _bootstrap_external
  from .None import machinery
  from ._abc import Loader
  import abc
  import warnings
  from .resources import abc
label_desc: Use image node_id 2 for calling a global function with example usage: _register(abstract_cls) without return types