docs: def get_instance_from_path(path, *args, **kwargs):
      """ Return an instance of a class, given the dotted
          Python import path (as a string) to the backend class.
  
          If the backend cannot be located (e.g., because no such module
          exists, or because the module does not contain a class of the
          appropriate name), ``django.core.exceptions.ImproperlyConfigured``
          is raised.
      """
      i = path.rfind('.')
      module, attr = path[:i], path[i+1:]
      try:
          mod = import_module(module)
      except ImportError, e:
          raise ImproperlyConfigured('Error loading registration backend %s: "%s"' % (module, e))
      try:
          backend_class = getattr(mod, attr)
      except AttributeError:
          raise ImproperlyConfigured('Module "%s" does not define a registration backend named "%s"' % (module, attr))
  
      return backend_class(*args, **kwargs)