#!/usr/local/bin/python3

class B(object):
  def __init__(self):
    print('B.__init__')
    self.a = 0
    self.b = 0

class C(B):
  def __init__(self):
    print('C.__init__')
    self._a = 1
    super().__init__()

  @property
  def a(self):
    print('C.a')
    return self._a

print(C().a)