repr or str of jitclass object

[Michael Boyle]

I really like the new jitclass decorator.  Not knowing how things work under the hood, it seems like it should be easy-ish to implement `__repr__` and `__str__` methods.  For example, say I create some object `Pair`, which just holds a pair of floats.  When I'm playing in ipython, I'd like to be able to print the Pair object, and see those two floats.  Is this a reasonable possibility?

[Stanley Seibert]

Yes, we definitely want to add this capability.  More broadly, we want to allow there to be non-JIT methods on a JIT class, which would be needed for things like __repr__ and __str__ to work.

On Tue, Feb 2, 2016 at 3:56 PM, Michael Boyle <michael.ol...@gmail.com> wrote:

I really like the new jitclass decorator.  Not knowing how things work under the hood, it seems like it should be easy-ish to implement `__repr__` and `__str__` methods.  For example, say I create some object `Pair`, which just holds a pair of floats.  When I'm playing in ipython, I'd like to be able to print the Pair object, and see those two floats.  Is this a reasonable possibility?

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[Michael Boyle]

As a workaround for displaying them nicely, there's at least the following option in ipython, which automatically calls the function you give it for the type you specify.  Here, I've made up an example `MyObject` class, which has some defining attributes `w`, `x`, `y`, and `z`:

ip = get_ipython()
text_formatter=ip.display_formatter.formatters['text/plain']
def _print_jitted_object(arg, p, cycle):
    """Pretty print a jitclass instance"""
    p.text("{0}({1}, {2}, {3}, {4})".format(type(arg).__name__, arg.w, arg.x, arg.y, arg.z))
text_formatter.for_type('numba.jitclass.boxing.MyClass', _print_jitted_object);