29     def add_node(self, node):  argument
33         self.__nodes.add(node)
141     def depends_on(self, node):  argument
143         return sorted(self.__edge_map[node], key=node_key)
145     def required_by(self, node):  argument
147         return sorted(self.__reverse_map[node], key=node_key)
149 def node_key(node):  argument
155     if node.parent:
156         parent_path = node.parent.path
160     if node.unit_addr is not None:
161         name = node.name.rsplit('@', 1)[0]
162         unit_addr = node.unit_addr
164         name = node.name