Demonstration of how mixins can be used to consolidate common __init__ functionality for classes that have differing superclasses

mixins_and_init_sharing.py

class SomeMixin(object):
    def __init__(self, rel=None, attrs=None, *args, **kwargs):
        print 'Testing sharing an __init__ via a mixin class'
        self.someattr = "sm"
        super(SomeMixin, self).__init__(*args, **kwargs)
class SomeSuper1(object):
    def __init__(self, rel=None, attrs=None, *args, **kwargs):
        print 'Testing sharing an __init__ via a super1 class'
class SomeSuper2(object):
    def __init__(self, rel=None, attrs=None, *args, **kwargs):
        print 'Testing sharing an __init__ via a super2 class'
class TestClass1(SomeMixin, SomeSuper1):
    def __init__(self, rel=None, attrs=None, *args, **kwargs):
        super(TestClass1, self).__init__(*args, **kwargs)
        self.banana = "tc1"
        print ("base1")
class TestClass2(SomeMixin, SomeSuper2):
    def __init__(self, rel=None, attrs=None, *args, **kwargs):
        super(TestClass2, self).__init__(*args, **kwargs)
        self.banana = "tc2"
        print ("base2")

print "About to instantiate TestClass1"
t1 = TestClass1()
print "Finished instantiate of TestClass1"
print "About to instantiate TestClass2"
t2 = TestClass2()
print "Finished instantiate of TestClass2"
print t2.someattr
print t2.banana
print t1.someattr
print t1.banana