data_structures.py 文件源码

def add_edge(self, s, t, attrs=None, **attr):
        # set up attribute dict (from Networkx to preserve the signature)
        if attrs is None:
            attrs = attr
        else:
            try:
                attrs.update(attr)
            except AttributeError:
                raise ValueError(
                    "The attr_dict argument must be a dictionary."
                )
        if s not in self.nodes():
            raise ValueError("Node %s is not defined!" % s)
        if t not in self.nodes():
            raise ValueError("Node %s is not defined!" % t)
        source_type = self.node[s].type_
        target_type = self.node[t].type_
        if self.metamodel_ is not None:
            if (source_type, target_type) not in self.metamodel_.edges():
                raise ValueError(
                    "Edge from '%s' to '%s' is not allowed by metamodel" %
                    (source_type, target_type)
                )
        normalize_attrs(attrs)
        nx.DiGraph.add_edge(self, s, t, attrs)