[New-bugs-announce] [issue13290] get vars for object with __slots__

João Bernardo report at bugs.python.org
Sat Oct 29 09:04:10 CEST 2011

New submission from João Bernardo <jbvsmo at gmail.com>:

I just realized the builtin function `vars` can't handle custom objects without the __dict__ attribute.

It would be nice if it worked with objects that have __slots__ to make them look more like normal objects and to make debugging easier.

I changed the source of "Python/bltinmodule.c" to accept this new case, but, as I'm fairly new to the C API, it may not be much good.

I'm attaching the whole file to this Issue and the `builtin_vars` function was modified (lines 1859 to 1921) to work with:
__slots__ = ('a', 'b', 'c')
__slots__ = 'single_name'
__slots__ = {'some': 'mapping'}

The output is a dict (just like in the __dict__ case).

>>> class C:
       __slots__ = ['x', 'y']

>>> c = C()
>>> c.x = 123
>>> vars(c)
{'x': 123}

components: Interpreter Core
files: bltinmodule.c
messages: 146598
nosy: JBernardo
priority: normal
severity: normal
status: open
title: get vars for object with __slots__
type: feature request
versions: Python 3.2, Python 3.3
Added file: http://bugs.python.org/file23546/bltinmodule.c

Python tracker <report at bugs.python.org>

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