def set_tweights_all(self, tweights):
        r"""
        Set all t-weights at once.
        
        Parameters
        ----------
        tweights : iterable
            Containing a pair of numeric values for each of the graphs nodes.
        
        Notes
        -----
        Since this method overrides already existing t-weights, it is strongly
        recommended to run `set_source_nodes` and `set_sink_nodes` after the
        last call to this method.
        
        The weights for nodes directly connected to either the source or the sink
        are best set using `set_source_nodes` or `set_sink_nodes` to ensure
        consistency of their maximum values.
        """
        for node, (twsource, twsink) in enumerate(tweights):
            self.set_tweight(node, twsource, twsink)