Multiple inheritance problem in Python!

Question

Why does c.print_a() output 'B'?

class A(object):
    def __init__(self):
        self.some_name = 'A'

    def print_a(self):
        print self.some_name

class B(object):
    def __init__(self):
        self.some_name = 'B'

    def print_b(self):
        print self.some_name

class C(A, B):
    def __init__(self):
        A.__init__(self)
        B.__init__(self)

if __name__ == '__main__':
    c = C()
    c.print_a()

---

class A(object):
    def __init__(self, some_name='A'):
        self.some_name = some_name

    def print_a(self):
        print self.some_name

class B(object):
    def __init__(self, some_name='B'):
        self.some_name = some_name

    def print_b(self):
        print self.some_name

class C(A, B):
    def __init__(self):
        A.__init__(self, some_name='AAAAA')
        B.__init__(self, some_name='BBBBB')

if __name__ == '__main__':
    c = C()
    c.print_a()

Answer 1

You only have a single object here; the some_name property is shared between methods from all inherited classes. You call A.__init__, which sets it to A, then B.__init__, which changes it to B.

Also note that you're calling base methods incorrectly; use super:

class A(object):
    def __init__(self):
        self.some_name = 'A'
        super(A, self).__init__()

    def print_a(self):
        print self.some_name

class B(object):
    def __init__(self):
        self.some_name = 'B'
        super(B, self).__init__()

    def print_b(self):
        print self.some_name

class C(A, B):
    def __init__(self):
        super(C, self).__init__()

if __name__ == '__main__':
    c = C()
    c.print_a()