Re: how to get names of attributes

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From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: how to get names of attributes
Date	Wed, 30 Dec 2015 23:34:03 +1100
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On Wed, Dec 30, 2015 at 11:16 PM, Charles T. Smith
<cts.private.yahoo@gmail.com> wrote:
> I'm glad I discovered __mro__(), but how can I do the same thing for old-
> style classes?

You should be able to track through __bases__ and use vars() at every level:

>>> class X: pass
...
>>> class Y(X): pass
...
>>> class Z(Y): pass
...
>>> X.x=1
>>> Y.y=2
>>> Z.z=3
>>> inst=Z()
>>> inst.i=4
>>> def class_vars(old_style_class):
...     v = {}
...     for cls in old_style_class.__bases__:
...         v.update(class_vars(cls))
...     v.update(vars(old_style_class))
...     return v
...
>>> def all_vars(old_style_inst):
...     v = class_vars(old_style_inst.__class__)
...     v.update(vars(old_style_inst))
...     return v
...
>>> all_vars(inst)
{'i': 4, '__module__': '__main__', 'y': 2, 'x': 1, 'z': 3, '__doc__': None}

I'm not 100% sure I've matched the MRO here, but if all you want is
the complete set of attribute names, this should work - I think.

ChrisA

Thread

how to get names of attributes "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2015-12-30 11:51 +0000
  Re: how to get names of attributes Chris Angelico <rosuav@gmail.com> - 2015-12-30 22:58 +1100
  Re: how to get names of attributes "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2015-12-30 12:16 +0000
    Re: how to get names of attributes Chris Angelico <rosuav@gmail.com> - 2015-12-30 23:34 +1100
  Re: how to get names of attributes "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2015-12-30 12:40 +0000
    Re: how to get names of attributes Chris Angelico <rosuav@gmail.com> - 2015-12-30 23:50 +1100
      Re: how to get names of attributes "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2015-12-30 13:31 +0000
        Re: how to get names of attributes Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-12-30 14:16 +0000
        Re: how to get names of attributes Chris Angelico <rosuav@gmail.com> - 2015-12-31 00:45 +1100
    Re: how to get names of attributes Random832 <random832@fastmail.com> - 2015-12-30 12:04 -0500
    Re: how to get names of attributes Chris Angelico <rosuav@gmail.com> - 2015-12-31 09:26 +1100
  Re: how to get names of attributes Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-12-30 14:10 +0000
    Re: how to get names of attributes "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2015-12-30 14:50 +0000
  Re: how to get names of attributes Steven D'Aprano <steve@pearwood.info> - 2015-12-31 10:58 +1100
    Re: how to get names of attributes "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2015-12-31 10:46 +0000

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