[Tutor] Unexpected results with obj.method().method()

[C M Caine]

I edited the output of Lines 109-111 from my source code out of the
interpreter transcripts above, by the by.


On 5 December 2012 18:11, C M Caine <cmcaine at googlemail.com> wrote:

> Dear all,
>
> I've written a class State that subclasses tuple. The class has a method
> move_state that takes a move and returns a new state object representing
> the new state of the game.
>
> I would expect S1 and S3 to be equal on the last line here, but they are
> not.
>
> >>> import game
> >>> S = game.State()
> >>> S1 = S.move_state(1).move_state("SWAP")
> >>> S2 = S.move_state(1)
> >>> S3 = S2.move_state("SWAP")
> >>> S1 == S3
> False
>
> Printing the two states shows that they have very different internal
> states.
>
> >>> print S1
>  (8, 8, 8, 8, 8, 8, 0)
> 1                     0
>  (7, 7, 7, 7, 7, 7, 7)
> >>> print S3
>  (7, 7, 7, 7, 7, 7, 7)
> 0                     1
>  (0, 8, 8, 8, 8, 8, 8)
>
> If anyone is interested, State represents the state of a 7 7 Kalah board.
>
> The full code is on pastebin http://pastebin.com/tUh0W5Se
>
> Are my expectations faulty? (I hope not)
> Have I made some mistake in my code to get these results?
>
> Thanks in advance,
> Colin Caine
>
>
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