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Edit: structs.py
class DirectedGraph(object): """A graph structure with directed edges. """ def __init__(self): self._vertices = set() self._forwards = {} # <key> -> Set[<key>] self._backwards = {} # <key> -> Set[<key>] def __iter__(self): return iter(self._vertices) def __len__(self): return len(self._vertices) def __contains__(self, key): return key in self._vertices def copy(self): """Return a shallow copy of this graph. """ other = DirectedGraph() other._vertices = set(self._vertices) other._forwards = {k: set(v) for k, v in self._forwards.items()} other._backwards = {k: set(v) for k, v in self._backwards.items()} return other def add(self, key): """Add a new vertex to the graph. """ if key in self._vertices: raise ValueError("vertex exists") self._vertices.add(key) self._forwards[key] = set() self._backwards[key] = set() def remove(self, key): """Remove a vertex from the graph, disconnecting all edges from/to it. """ self._vertices.remove(key) for f in self._forwards.pop(key): self._backwards[f].remove(key) for t in self._backwards.pop(key): self._forwards[t].remove(key) def connected(self, f, t): return f in self._backwards[t] and t in self._forwards[f] def connect(self, f, t): """Connect two existing vertices. Nothing happens if the vertices are already connected. """ if t not in self._vertices: raise KeyError(t) self._forwards[f].add(t) self._backwards[t].add(f) def iter_edges(self): for f, children in self._forwards.items(): for t in children: yield f, t def iter_children(self, key): return iter(self._forwards[key]) def iter_parents(self, key): return iter(self._backwards[key])
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