Quick example of multiple inheritance for alts

supertest.py

class _AltRecord(object):
    def __init__(self, alt_type, **kwargs):
        print "_AltRecord"
        super(_AltRecord, self).__init__(**kwargs)
        self.alt_type = alt_type

class _Substitution(_AltRecord):
    def __init__(self, sequence, **kwargs):
        print "_Substitution"
        if len(sequence) == 1:
            super(_Substitution, self).__init__(alt_type="SNV", **kwargs)
        else:
            super(_Substitution, self).__init__(alt_type="MNV", **kwargs)
        self.sequence = sequence

class _Unknown(object):
    def __init__(self, unknown=True, **kwargs):
        print "_Unknown"
        super(_Unknown, self).__init__(**kwargs)
        self.unknown = unknown

class _UnknownSubs(_Unknown, _Substitution):
    def __init__(self, sequence, **kwargs):
        print "_UnknownSubs"
        super(_UnknownSubs, self).__init__(sequence=sequence, **kwargs)
        print self.sequence, self.alt_type, self.unknown


def test(cl, **kwargs):
    print "MRO:", [x.__name__ for x in cl.__mro__]
    print "Calls:",
    cl(**kwargs)
    print

if __name__ == "__main__":
    #test(_AltRecord, alt_type="x")
    #test(_Substitution, sequence="ATG")
    #test(_Unknown)
    test(_UnknownSubs, sequence="G")