code: def load_config(self):
          
          for local_var, config_var in self.from_config.items():
              value = flask.current_app.config.get(config_var)
              if value:
                  if "." in local_var:
                      # this is a dotpath -- needs special handling
                      body, tail = local_var.rsplit(".", 1)
                      obj = getattrd(self, body)
                      setattr(obj, tail, value)
                  else:
                      # just use a normal setattr call
                      setattr(self, local_var, value)
docs: Used to dynamically load variables from the Flask application config
          into the blueprint. To tell this blueprint to pull configuration from
          the app, just set key-value pairs in the ``from_config`` dict. Keys
          are the name of the local variable to set on the blueprint object,
          and values are the variable name in the Flask application config.
          For example:
  
              blueprint.from_config["session.client_id"] = "GITHUB_OAUTH_CLIENT_ID"