Is __ne__ method autogenerated?

INADA Naoki songofacandy at
Fri Dec 7 07:03:09 CET 2012

The reference says:

  The truth of x==y does not imply that x!=y is false.
  Accordingly, when defining __eq__(), one should also
  define __ne__() so that the operators will behave as expected.


But I saw different behavior on 3.3:

Could anyone teach me what happen about my code?

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