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[Python-Dev] Very Strange Argument Handling Behavior

Maciej Fijalkowski fijall at gmail.com
Sat Apr 17 23:47:08 CEST 2010 
On Sat, Apr 17, 2010 at 1:03 PM, Steve Holden <steve at holdenweb.com> wrote:
> Dino Viehland wrote:
>> Maciej wrote:
> [...]
>>> And yet that breaks some code :-)
>>
>> Sure, if you do:
>>
>> class C(object):
>>     locals()[object()] = 42
>>
>> dir(C)
>>
>> You lose.  Once I'm aware of some piece of code in the wild doing this
>> then I'll be happy to change IronPython to be more compatible. :)
>>
>>
> This would be a lose anyway, since the CPython specifications suggest
> that you should not rely on being able to change locals() (or at least
> shouldn't expect that such changes are actually reflected in the local
> namespace).

You can override __new__ of a type subclass to achieve the same effect
(or even directly call type.__new__ with strange dict as an argument).

Cheers,
fijal
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