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Showing content from https://mail.python.org/pipermail/python-dev/2006-November/069943.html below:

[Python-Dev] __dir__, part 2

[Python-Dev] __dir__, part 2 [Python-Dev] __dir__, part 2Fredrik Lundh fredrik at pythonware.com
Fri Nov 10 21:26:34 CET 2006
Guido van Rossum wrote:

> I think that ought to go into the guidlines for what's an acceptable
> __dir__ implementation. We don't try to stop people from overriding
> __add__ as subtraction either.

to me, overriding dir() is a lot more like overriding id() than over- 
riding "+".  I don't think an object should be allowed to lie to the 
introspection mechanisms.

</F>

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