Kay Schluehr wrote:
Since it is acting on a tree why doesn't the code substitute self in
its parent by SS? That's the natural perspective if one considers a
tree as a linked structure and inserts and deletes nodes within this
structure.
I think you are suggesting the same thing I did:
> If you examine nodes from their parent, I believe you can do the
> > substitution in one step. Something like:
> >
> > for slot,child in ( ('left',self.left), ('right',self.right) ):
> > if child is not None:
> > if child.val == 'f':
> > setattr(self, slot, F.copy().subst('x', child.left))
> > child.elimF
> >
> > where .subst returns the modified tree.
Where F.copy is what was called 'SS'. If not, I don't understand.
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