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Groups > comp.lang.python > #40646

Re: Creating an object that can track when its attributes are modified

From Lele Gaifax <lele@metapensiero.it>
Subject Re: Creating an object that can track when its attributes are modified
Date 2013-03-06 17:56 +0100
Organization Nautilus Entertainments
References <b281a2a6-5822-45c7-bf69-c80c738ef92c@googlegroups.com>
Newsgroups comp.lang.python
Message-ID <mailman.2951.1362588987.2939.python-list@python.org> (permalink)

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Ben Sizer <kylotan@gmail.com> writes:

> I also believe that this won't catch modification to existing
> attributes as opposed to assignments: eg. if one of the attributes is
> a list and I append to it, this system won't notice. Is that something
> I can rectify easily?

It's really up to how far you wanna go: a similar use case is
implemented by SQLAlchemy__, which "instrument" builtin collection
classes to achieve the goal. But I'd not call that "easy" though :-)

ciao, lele.

__ http://www.sqlalchemy.org/trac/browser/lib/sqlalchemy/orm/collections.py
-- 
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele@metapensiero.it  |                 -- Fortunato Depero, 1929.

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Thread

Creating an object that can track when its attributes are modified Ben Sizer <kylotan@gmail.com> - 2013-03-06 08:07 -0800
  Re: Creating an object that can track when its attributes are modified Chris Angelico <rosuav@gmail.com> - 2013-03-07 03:22 +1100
    Re: Creating an object that can track when its attributes are modified Ben Sizer <kylotan@gmail.com> - 2013-03-06 08:56 -0800
      Re: Creating an object that can track when its attributes are modified Chris Angelico <rosuav@gmail.com> - 2013-03-07 04:03 +1100
      Re: Creating an object that can track when its attributes are modified 88888 Dihedral <dihedral88888@googlemail.com> - 2013-03-06 13:07 -0800
      Re: Creating an object that can track when its attributes are modified 88888 Dihedral <dihedral88888@googlemail.com> - 2013-03-06 13:07 -0800
    Re: Creating an object that can track when its attributes are modified Ben Sizer <kylotan@gmail.com> - 2013-03-06 08:56 -0800
      Re: Creating an object that can track when its attributes are modified Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-07 00:07 +0000
        Re: Creating an object that can track when its attributes are modified Ben Sizer <kylotan@gmail.com> - 2013-03-06 16:26 -0800
          Re: Creating an object that can track when its attributes are modified Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-03-08 18:50 +0000
  Re: Creating an object that can track when its attributes are modified Lele Gaifax <lele@metapensiero.it> - 2013-03-06 17:56 +0100
  Re: Creating an object that can track when its attributes are modified Schneider <js@globe.de> - 2013-03-07 13:21 +0100

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