(self)
Override in subclass to force sending of recent '_write()' calls

        It's okay if this method is a no-op (i.e., if '_write()' actually
        sends the data.
Override in subclass to force sending of recent '_write()' calls
Override in subclass to force sending of recent _write () calls
def _flush(self):
        """Override in subclass to force sending of recent '_write()' calls

        It's okay if this method is a no-op (i.e., if '_write()' actually
        sends the data.
        """
        raise NotImplementedError
def _flush ( self ) : raise NotImplementedError