class Foo:
  attr = "Common"
  
  def __init__(self, arg1, arg2):
    self.attr1 = arg1 # Instance attribute
    self.attr2 = arg2
    self._attr_prot = 2 * arg1
    self.__attr_priv = 10 * arg1
    
  def get_priv(self):
    return self.__attr_priv


def main():
  f = Foo(1, "a")
  print(f.attr1)        # 1
  print(f._attr_prot)   # 2
  #print(f.__attr_priv) # AttributeError: 'Foo' object has no attribute '__attr_priv'. Did you mean: '_attr_prot'?
  print(f.get_priv())   # 10
  

if __name__ == '__main__':
  main()