code: def _get_targets(self, target, include_global=True):
          
          target = self._coerce_target(target)
          if include_global:
              yield ''
          if not target:
              return
          target_bits = target.split('.')
          for i in range(len(target_bits)):
              yield '.'.join(target_bits[:i + 1])
docs: Internal iterator to split up a complete target into the possible parts
          it may match.
  
          For example::
  
              >>> list(aliases._get_targets('my_app.MyModel.somefield'))
              ['', 'my_app', 'my_app.MyModel', 'my_app.MyModel.somefield']