mi.py

class HomeMixin(object):
    def __init__(self, home, *args, **kwargs):
        super(HomeMixin, self).__init__(*args, **kwargs)
        self.home = home

class PenMixin(object):
    def __init__(self, pen, *args, **kwargs):
        super(PenMixin, self).__init__(*args, **kwargs)
        self.pen = pen

class PenAndHome(PenMixin, HomeMixin):
    pass

inst = PenAndHome("pen", "home")
print inst.pen  # prints pen
print inst.home  # prints home