code: def set_uservar(self, user, name, value):
          
          self._session.set(user, {name: value})
docs: Set a variable for a user.
  
          This is like the ``<set>`` tag in RiveScript code.
  
          :param str user: The user ID to set a variable for.
          :param str name: The name of the variable to set.
          :param str value: The value to set there.