On Nov 4, 2018, at 12:43 PM, Michael Selik <[email protected]> wrote:
> If you're making a module
>>
> > On Sun, Nov 4, 2018, 5:49 AM David Shawley <[email protected] wrote:
> > Personally, I would place this sort of serialization logic outside of the
> > Standard Library -- maybe following the pattern that the rust community
> > adopted on this very issue. In short, they separated serialization &
> > de-serialization into a free-standing library.
>
> You don't need a bug on the tracker or discussion on -dev to share a module
> on PyPI or GitHub. When you've got something started, share a link in this
> thread.
I modified a branch of python/cpython to implement what I had in mind. [1]
The idea is to introduce a new protocol with a single method:
self.jsonformat() -> object
If this method exists, then json.encoder.JSONEncoder will call it
to generate a JSON representation *instead* of calling *default*.
This method must return a value that json.encoder.JSONEncoder can
encoder or fail in the same manner as the *default* hook.
The implementation wasn't too difficult once I learned a little more about
how Standard Library classes are implemented when C speedups are included.
There are a few things that I haven't done:
1. I didn't guard the functionality with a flag to the JSONEncoder
initializer. This was oversight but I would add one before doing a PR
against python/cpython.
2. As discussed before this is an asymmetric proposal since there is no
support for detecting and de-serializing in JSONDecoder.
That is what I had in mind. I'm not sure how we want to spell extension
methods like this one. I chose to not use a double-underscore method since
I view them as ``for use by the interpreter/language'' more so than for
Library-recognised methods. The name is the least of my worries.
Let me know if there is any reason that I shouldn't move forward with a bpo
and PR against python/cpython.
- cheers, dave.
[1]: https://github.com/dave-shawley/cpython/pull/2
<https://github.com/dave-shawley/cpython/pull/2>
--
"State and behavior. State and behavior. If it doesn’t bundle state and
behavior in a sensible way, it should not be an object, and there should not be
a class that produces it." eevee
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