[New-bugs-announce] [issue16938] pydoc confused by __dir__

Ronald Oussoren report at bugs.python.org
Fri Jan 11 23:42:09 CET 2013

New submission from Ronald Oussoren:

If a class implements __dir__ to also return a number of attributes that aren't present in the class __dict__ inspect.classify_class_attrs gets confused and assumes the home class is None.

This in turn confused pydoc, docclass in pydoc assumes that the 'class' slot in the sequence returned by classify_class_attrs is actually a class and fails when it None (because None doesn't have a __name__ attribute).

I've classified this as "low" because I've found a useable workaround: I have implemented a "__objclass__" property for my custom descriptor and with that pydoc works.

It would be nice if pydoc wouldn't crash on this. One possible workaround: assume that the class is the inspected class when a name returned by dir(cls) cannot be found in one of the classes on the mro.

I'll provide a patch if this would be acceptable behavior.

components: Library (Lib)
messages: 179738
nosy: ronaldoussoren
priority: low
severity: normal
stage: test needed
status: open
title: pydoc confused by __dir__
type: behavior
versions: Python 2.7, Python 3.4

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