Something like Ruby's modules in Python

gistfile1.py

# dynamically injecting into the multiple inheritance chain, like ruby's modules.
# can we stop fighting already?

class Foo(object):
    pass

class Bar(Foo):
    pass

class Baz(object):
    # no constructor makes it like a module
    def baz():
        pass

b = Bar()

print(Bar.__bases__)
# => (<class '__main__.Foo'>,)

# concatenate in any order you wish to control resolution order
Bar.__bases__ =  Bar.__bases__ + (Baz,)

print(Bar.__bases__)
# => (<class '__main__.Foo'>, <class '__main__.Baz'>)

print(b.baz)
# => <bound method Bar.baz of <__main__.Bar object at 0x244d350>>