Re: [Jython-users] jython - dicts and methods

[Ype K. <yk...@xs...>]

Dirk,

>Hello,
>
>I have noticed a strange behavior of Jython. Coming from CPython I run
>into this problem and I'm not sure if it was pure luck that this worked
>for me so far, or if jython has a bug.
>
>Consider the following program:
>
>class c:
>    def m(self):
>        pass
>
>i = c()
>
>d = {}
>
>d[i.m] = 42
>d[i.m] = 23
>print d
>
>This yields, not very suprising, this result with CPython 2.1.1:
>dirk@susi:~/python> python test.py
>{<method c.m of c instance at 0x80e6394>: 23}
>
>With Jython 2.1 and Sun Java2 1.4rc1 however:
>dirk@susi:~/python> ../jython-2.1/jython test.py
>{<method c.m of c instance at 16348303>: 23, <method c.m of c instance
>at 16348303>: 42}
>
>Well, this caught me rather off-guard and I debug quite a while. I would
>be extremely happy I anybody could explain this to me. I'm quite unsure
>how Python or Jython compare methods anyway.

I think this is a bug in jython: the same method instance can occur
multiple times as a key in a dictionary.
I'd recommend to file the original message as a bug report on
jython.sourceforge.net.

Regards,
Ype

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