Re: [Jython-dev] The "is" operator in new style classes

[Samuele P. <ped...@st...>]

Frank Wierzbicki wrote:

>Sorry about the repetition, but I forgot to give the email a useful subject.
>
>I'm almost finished with PyTuple, but I'm having a problem with the
>"is" operator.
>
>  
>
>>>>t0_3 = (0,1,2,3)
>>>>t0_3
>>>>        
>>>>
>(0, 1, 2, 3)
>  
>
>>>>t0_3_bis = tuple(t0_3)
>>>>t0_3 is t0_3_bis
>>>>        
>>>>
>0
>  
>
>>>>t0_3 == t0_3_bis
>>>>        
>>>>
>1
>
>the "t0_3 is t0_3_bis" should return 1.  So my question is, how is
>"is" implemented in new style classes?
>
>  
>
I think this is about __new__ really, tuples are immutable (so they also 
have no __init__),
this means expose_new_immutable should be used and then one have to 
implement the static tuple_new delegate
method which if it gets a tuple argument should simply return it 
directly, this was also the behavior of the old tuple
builtin function.