inheritance of constructors

Question

class A(object):
def __init__(self):
print (1)
class B(A):
def __init__(self):
super(A, self).__init__()
print (2)
B()
Why print just 2?

Answer 1

Hmmm, maybe because A has no Parent?

Answer 2

The super-Function didn't need any Arguments. Just change the line:
super().__init__()

Answer 3

Yes, exectly! You are right!

Answer 4

It's properly. Yes, but its optional in python3 and if I write super(A, self), there is no error.
And I tried in python2.7 to lainch the code (the same code, but without the parentheses after print) and I have experimented and I have the same results: just 2
i know: if i write super(B, self) instead super(A, self), i'll get all right: 12. But I do not know, what is the different beetwen A and B in super-function?
why super(A,self) do not call the __init__ of the parent?