补全networkx TODO部分。

Question

import networkx as nx

class SecDepGraph:
def init(self):
self.graph = nx.DiGraph()

    # Map aliases to vertex names
    self.aliases = dict()

    # Map vertex names to flags (strings) that will be used when processing the graph

    # Map vertex names to auxiliary data for reporting etc. but not when processing the graph
    self.auxdata = dict()

    # Collection of edges to add in second pass
    self.cached_edges = set()

def add_vertex(self, vertexname, flags, auxdata=None):
    # TODO: check if vertex already exists or is an alias.  What to do in that case?
    
    # add the vertex

    # Always adding auxdata, but will be None if not passed in.
    self.auxdata[vertexname] = auxdata

def add_alias(self, vertexname, alias):
    # TODO: check if alias already exists or is a vertex.  What to do in that case?

    self.aliases[alias] = vertexname

def cache_edge(self, fromvertex, tovertex):
    '''Store an edge to be added later, after vertices and aliases are finalised.'''


def add_edge(self, fromvertex, tovertex):
    '''Add edge to the graph immediately.'''
    # check that both vertices exist or resolve aliases

    # add the edge

    pass

def finalise_edges(self):
    '''Add cached edges to the graph after all vertices and alias are finalised (stage 2).'''
    for (u,v) in self.cached_edges:
        self.add_edge(u, v)

    self.cached_edges = set()

Answer 1

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您可以参考如下，如果回答的不正确，及时评论区回复我，我会根据你错误描述追加回复，直到您满意为止。

在SecDepGraph类中，你需要实现add_vertex和add_alias方法来检查是否已经存在同名的顶点或别名，并处理这些情况。以下是完成这些方法的代码：

import networkx as nx

class SecDepGraph:
    def __init__(self):
        self.graph = nx.DiGraph()
        self.aliases = dict()
        self.auxdata = dict()
        self.cached_edges = set()

    def add_vertex(self, vertexname, flags, auxdata=None):
        if vertexname in self.graph.nodes or vertexname in self.aliases.values():
            raise ValueError(f"Vertex '{vertexname}' already exists.")
        self.graph.add_node(vertexname)
        self.auxdata[vertexname] = auxdata or {}

    def add_alias(self, vertexname, alias):
        if alias in self.graph.nodes or alias in self.aliases:
            raise ValueError(f"Either vertex '{alias}' or alias already exists.")
        if vertexname not in self.graph.nodes:
            raise ValueError(f"Cannot create alias for non-existent vertex '{vertexname}'.")
        self.aliases[alias] = vertexname

    def cache_edge(self, fromvertex, tovertex):
        self.cached_edges.add((fromvertex, tovertex))

    def add_edge(self, fromvertex, tovertex):
        self._resolve_aliases(fromvertex, tovertex)
        self.graph.add_edge(fromvertex, tovertex)

    def _resolve_aliases(self, fromvertex, tovertex):
        if fromvertex in self.aliases:
            fromvertex = self.aliases[fromvertex]
        if tovertex in self.aliases:
            tovertex = self.aliases[tovertex]
        return fromvertex, tovertex

    def finalise_edges(self):
        for (u, v) in self.cached_edges:
            self.add_edge(u, v)
        self.cached_edges = set()

在这个版本中，add_vertex和add_alias方法会检查新添加的顶点或别名是否已经存在，并抛出异常以避免冲突。add_edge方法使用_resolve_aliases辅助方法来解析别名并添加边。这应该满足你的需求。