property question

George Sakkis george.sakkis at
Tue Oct 9 08:06:44 CEST 2007

On Oct 9, 1:20 am, "Manu Hack" <manuh... at> wrote:
> hi all,
> If I have a class A with A.x, A.y, A.z.  A.y and A.z are property and
> in order to compute the value of them, A.y depends on A.x while A.z
> depends on A.y and A.x.  If I call A.y, and A.z, the value A.y would
> be computed twice.  Is there a smart way to avoid that as to A.y will
> be recomputed only if A.x has been changed?  Now I can define more
> variables to keep track of what is changed but when there are more
> variables and the dependency becomes more involved it could be very
> complicated.  Thanks a lot.
> Manu

I haven't needed to use it myself so far, but PyCells (http:// seems it might fit the bill.


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