__init__(self)-3

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class BaseA(object):
  def __init__(self):
    print("BaseA.__init__")
 
class BaseB(object):
  def __init__(self):
    print("BaseB.__init__")

class Derived(BaseA, BaseB):
  def __init__(self):
    BaseA.__init__(self)
    BaseB.__init__(self)
    print("Derived.__init__")

derived = Derived()