[IPython-dev] ANN: numtraits v0.2

[Nicholas Bollweg]

Really awesome! FurlongsPerHogsheadFloatSliders for everyone!

When using this with widgets in the notebook, i would desperately want the
units/shapes to be available on the frontend in math.js and (some matrix
library) wrappers, though I'm not sure how compatible their unit system is
with astropy's. Any thoughts about that?

We also use openmdao, and would love to be able to use their units
directly... Do you think that would be extensible?

On 08:13, Thu, Oct 1, 2015 Thomas Robitaille <thomas.robitaille at gmail.com>
wrote:

> Hi everyone,
>
> (I sent this to ipython-user but didn't realize it was deprecated, so
> re-sending to this list)
>
> We have released a small experimental package called numtraits that
> builds on top of the traitlets package and provides a NumericalTrait
> class that can be used to validate properties such as:
>
> * number of dimension (for arrays)
> * shape (for arrays)
> * domain (e.g. positive, negative, range of values)
> * units (with support for astropy.units, pint, and quantities)
>
> The idea is to be able to write a class like:
>
>     class Sphere(HasTraits):
>
>         radius = NumericalTrait(domain='strictly-positive', ndim=0)
>         position = NumericalTrait(shape=(3,))
>
> and all the validation will then be done automatically when the user
> sets 'radius' or 'position'.
>
> In addition, tuples and lists can get automatically converted to
> arrays, and default values can be specified. You can read more about
> the package and see examples of it in use here:
>
>   https://github.com/astrofrog/numtraits
>
> and it can be easily installed with
>
>   pip install numtraits
>
> The package supports both Python 3.3+ and Legacy Python (2.7) :)
>
> At this point, we would be very interested in feedback - the package
> is still very young and we can still change the API if needed. Please
> open issues with suggestions!
>
> Cheers,
>
> Tom and Francesco
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>
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