(self)
called when the connection had already terminated for cleanup
        (must not perform any IO on the connection)
called when the connection had already terminated for cleanup
        (must not perform any IO on the connection)
called when the connection had already terminated for cleanup ( must not perform any IO on the connection )
def on_disconnect(self):
        """called when the connection had already terminated for cleanup
        (must not perform any IO on the connection)"""
        pass
def on_disconnect ( self ) : pass