color_conversions.py 文件源码

def get_conversion_path(self, start_type, target_type):
        start_type = self._normalise_type(start_type)
        target_type = self._normalise_type(target_type)
        try:
            # Retrieve node sequence that leads from start_type to target_type.
            path = networkx.shortest_path(self.conversion_graph, start_type, target_type)
            # Look up edges between nodes and retrieve the conversion function for each edge.
            return [self.conversion_graph.get_edge_data(node_a, node_b)['conversion_function'] for node_a, node_b in
                    zip(path[:-1], path[1:])]
        except networkx.NetworkXNoPath:
            raise UndefinedConversionError(
                start_type,
                target_type,
            )