code: def unregister_layout(self, name):
          
  
          if not name in self:
              raise umbra.exceptions.LayoutRegistrationError("{0} | '{1}' layout is not registered!".format(
                  self.__class__.__name__, name))
  
          del (self.__layouts[name])
          return True
docs: Unregisters given layout.
  
          :param name: Layout name.
          :type name: unicode
          :param layout: Layout object.
          :type layout: Layout
          :return: Method success.
          :rtype: bool