Ahhh, 1 second, I haven't really quit from this. I could open another thread but it's highly related to this one.

I just came up with something that looks like a bug not a feature in the original c3.

    #!/usr/bin/env python3

    #        A       C
    #        B       D      X      A
    #                E      F
    #                G

    class A(object): pass
    class B(A): pass
    class C(object): pass
    class D(C): pass
    class X(object): pass
    class E(B, D, A): pass
    class F(B, D, X, A): pass
    class G(E, F): pass
    print(G.mro())

The script fails. It cannot find GEFBDCXA, which looks valid?

You can close again if you feel this isn't a bug. I'm gone for a while.