code: def set_access_credentials(self, scope, access_token, refresh_token=None,
                                 update_user=True):
          
          if isinstance(scope, (list, tuple)):
              scope = set(scope)
          elif isinstance(scope, six.string_types):
              scope = set(scope.split())
          if not isinstance(scope, set):
              raise TypeError('`scope` parameter must be a set')
          self.clear_authentication()
          # Update authentication settings
          self._authentication = scope
          self.access_token = access_token
          self.refresh_token = refresh_token
          # Update the user object
          if update_user and ('identity' in scope or '*' in scope):
              self.user = self.get_me()
docs: Set the credentials used for OAuth2 authentication.
  
          Calling this function will overwrite any currently existing access
          credentials.
  
          :param scope: A set of reddit scopes the tokens provide access to
          :param access_token: the access token of the authentication
          :param refresh_token: the refresh token of the authentication
          :param update_user: Whether or not to set the user attribute for
              identity scopes