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Showing content from https://mail.python.org/pipermail/python-dev/2006-November/069942.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 21:25:02 CET 2006
Thomas Heller wrote:

>>> No objection on targetting 2.6 if other developers agree. Seems this
>>> is well under way. good work!
 >>
>> given that dir() is used extensively by introspection tools, I'm
>> not sure I'm positive to a __dir__ that *overrides* the standard
>> dir() behaviour.  *adding* to the default dir() list is okay, re- 
>> placing it is a lot more questionable.
> 
> One part that *I* would like about a complete overridable __dir__ implementation
> is that it would be nice to customize what help(something) prints.

I don't think you should confuse reliable introspection with the help 
system, though.  introspection is used for a lot more than implementing 
help().

</F>

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