(self, callback)
This method is here in the event that subclasses of `BaseMultiplex` need
        to call callbacks in an implementation-specific way.  It just calls
        *callback*.
This method is here in the event that subclasses of `BaseMultiplex` need
        to call callbacks in an implementation-specific way.  It just calls
        *callback*.
This method is here in the event that subclasses of BaseMultiplex need to call callbacks in an implementation - specific way . It just calls * callback * .
def _call_callback(self, callback):
        """
        This method is here in the event that subclasses of `BaseMultiplex` need
        to call callbacks in an implementation-specific way.  It just calls
        *callback*.
        """
        callback()
def _call_callback ( self , callback ) : callback ( )