I have a below scenario

class A:
  def __del__(self):
    print("destructor")

  def abc(self):
    .....

class B(A):
   def abc(self):
     ..do something else...

   def hello(self):
      self.abc()
      ...do some more processing...

b = B()
b.hello()

Now b.hello() is still processing, and suddenly __del__ called which should not be expected. __del__ for b should be called once b.hello() is done.
Can someone please explain what is wrong here?