On Mon, Oct 25, 2010 at 13:30, Francesc Alted <fal...@pytables.org> wrote:
> Now that I think, I ended implementing this behaviour because I needed a
> way to pass a lot of parameters to the computational kernel. For
> passing such parameters, I implemented the next methods for `Expr`:
>
> * setInputsRange(start=None, stop=None, step=None)
> * setOutput(out, append_mode=False)
> * setOutputRange(start=None, stop=None, step=None)
>
> Do you think that it is better to be able to pass these params to
> `eval()` instead? Hmm, I'm not that sure...
Contrary to you, I wouldn't mind that solution, but I can understand
that you don't like it. Another option which would satisfy my needs
would be to have a "setUservars" method in addition to the others, so
that I could keep the same object to do my computation.
Another paradigm you *might* want to explore is a "generative"
approach (as is used for example for SQLAlchemy queries): each of
those methods return a new object, copying all aspects from the
expression except those changed by the "current" method. That way, you
could write:
e = Expr("a + 2 * b")
e_range = e.setInputRanges(10, 20)
e1 = e_range.setOutput(out1)
e2 = e_range.setOutput(out2)
I would find it nice but it is not important enough for me that I'd be
willing to write a patch for it, and this issue is totally orthogonal
to the uservars one.
--
Gaëtan de Menten
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