* relax add_vertex a bit
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@@ -9,7 +9,7 @@ class digraph(object):
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#self.__edata = {}
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#self.__edata = {}
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def add_vertex(u, data = None):
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def add_vertex(u, data = None):
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assert not u in self.__v
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#assert not u in self.__v
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self.__v.add(u)
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self.__v.add(u)
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if data!=None:
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if data!=None:
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self.__vdata[u] = data
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self.__vdata[u] = data
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