En Fri, 27 Nov 2009 15:12:36 -0300, Francis Carr <coldtort...@gmail.com>
escribió:
I was really inspired by this discussion thread! :-)
After much tinkering, I think I have a simpler solution. Just make
the inverse mapping accessible via an attribute, -AND- bind the
inverse of -THAT- mapping back to the original. The result is a
python dict with NO NEW METHODS except this inverse-mapping
attribute. I have posted it on code.activestate.com as <a
href="http://code.activestate.com/recipes/576968/";>Recipe 576968:
Flipdict -- python dict that also maintains a one-to-one inverse
mapping</a>
Nice idea! Just a couple of comments:
Instead of:
self._flip = dict.__new__(self.__class__)
I'd write:
self._flip = self.__class__()
unless I'm missing something (but see the next point).
Also, although Python's GC is able to handle them, I prefer to avoid
circular references like those between x and x._flip. Making self._flip a
weak reference (and dereferencing it in the property) should be enough.
--
Gabriel Genellina
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