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If you look at the __init__() method of the class you are inherting from, you will see that it has a keyword argument weighted, as well as many other keyword arguments; simply type

DiGraph.__init__?

to see this. To have a description of these arguments, type

DiGraph?

So, I would say that the __init__() method of your class should have a keyword argument weighted (possibly with the default value None) and should pass it to super(DoubleQuiver, self).__init__() as follows

    super(DoubleQuiver, self).__init__(edges, multiedges=True, weighted=weighted)

If you look at the __init__() method of the class you are inherting inheriting from, you will see notice that it has a keyword argument weighted, as well as many other keyword arguments; simply type

DiGraph.__init__?

to see this. To have a description of these arguments, type

DiGraph?

So, I would say that the __init__() method of your class should have a keyword argument weighted (possibly with the default value None) and should pass it to super(DoubleQuiver, self).__init__() as follows

    super(DoubleQuiver, self).__init__(edges, multiedges=True, weighted=weighted)

If you look at the __init__() method of the class you are inheriting from, you will notice that it has a keyword argument weighted, as well as many other keyword arguments; simply type

DiGraph.__init__?

to see this. To have a description of these arguments, type

DiGraph?

So, I would say that the __init__() method of your class should have a keyword argument weighted (possibly with the default value None) and should pass it to super(DoubleQuiver, self).__init__() as followsfollows:

    super(DoubleQuiver, self).__init__(edges, multiedges=True, weighted=weighted)