[Zope] Python script sort by id

[Tim Hicks]

----- Original Message -----
From: "Dieter Maurer" <dieter@handshake.de>
To: "Tim Hicks" <tim@sitefusion.co.uk>
Cc: <zope@zope.org>
Sent: Friday, July 27, 2001 8:21 PM
Subject: Re: [Zope] Python script sort by id


> Tim Hicks writes:
>  > I have a slightly strange problem with sorting in a python script.
>  > Basically, sorting by title and meta_type both work as expected, but by
id produces totally random results that I cannot fathom (I really can't see
any pattern at all).
> You know, that "id" is often a method and not an attribute.
> If it is, your comparisons will produce funny results.
>
> Use "getID()" instead.

def sort_id(ob1, ob2):
    return cmp(ob1.getID(), ob2.getID())

Thanks Dieter, but with this, I get...

"""
Error Type: AttributeError
Error Value: getID

Traceback (innermost last):
  File /mnt2/local/Zope-2.3.2-src/lib/python/ZPublisher/Publish.py, line
223, in publish_module
  File /mnt2/local/Zope-2.3.2-src/lib/python/ZPublisher/Publish.py, line
187, in publish
  File /mnt2/local/Zope-2.3.2-src/lib/python/Zope/__init__.py, line 221, in
zpublisher_exception_hook
    (Object: Traversable)
  File /mnt2/local/Zope-2.3.2-src/lib/python/ZPublisher/Publish.py, line
171, in publish
  File /mnt2/local/Zope-2.3.2-src/lib/python/ZPublisher/mapply.py, line 160,
in mapply
    (Object: index_html)
  File /mnt2/local/Zope-2.3.2-src/lib/python/ZPublisher/Publish.py, line
112, in call_object
    (Object: index_html)
  File /mnt2/local/Zope-2.3.2-src/lib/python/Shared/DC/Scripts/Bindings.py,
line 324, in __call__
    (Object: index_html)
  File /mnt2/local/Zope-2.3.2-src/lib/python/Shared/DC/Scripts/Bindings.py,
line 354, in _bindAndExec
    (Object: index_html)
  File
/mnt2/local/Zope-2.3.2-src/lib/python/Products/PythonScripts/PythonScript.py
, line 336, in _exec
    (Object: index_html)
    (Info: ({'script': &lt;PythonScript instance at 99beb0&gt;, 'context':
&lt;Folder instance at 99c478&gt;, 'container': &lt;Folder instance at
832438&gt;, 'traverse_subpath': []}, (), {}, None))
  File Script (Python), line 121, in index_html
    (Object: string)
  File &lt;string&gt;, line 40, in sort_id
    (Object: Traversable)
  File
/mnt2/local/Zope-2.3.2-src/lib/python/Products/PythonScripts/Guarded.py,
line 273, in __getattr__
  File
/mnt2/local/Zope-2.3.2-src/lib/python/Products/PythonScripts/Guarded.py,
line 143, in __careful_getattr__
    (Object: Traversable)
AttributeError: (see above)
"""

It seems that the cmp function needs to get hold of attributes, not methods.
Even if I specifically call a method on ob1 or ob2, getattr seems to be
called in there somewhere.

Any more clues?

tim