text: class A:
      def __eq__(self, other):
          print("A __eq__ called")
          return True
  
  class B:
      def __ne__(self, other):
          print("B __ne__ called")
          return True
  
  class C:
      def __eq__(self, other):
          print("C __eq__ called")
          return False
  
  class D:
      def __ne__(self, other):
          print("D __ne__ called")
          return False
  
  a = A()
  b = B()
  c = C()
  d = D()
  
  def test(s):
      print(s)
      print(eval(s))
  
  for x in 'abcd':
      for y in 'abcd':
          test('{} == {}'.format(x,y))
          test('{} != {}'.format(x,y))
  