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Subject: Re: Storing instances using jsonpickle
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On 2014-09-06 01:20, Chris Angelico wrote:
> On Sat, Sep 6, 2014 at 3:04 AM, MRAB <python@mrabarnett.plus.com>
> wrote:
>> JSON has 'true' and 'false'.
>>
>> Python has 'True' and 'False'.
>>
>> Therefore, if you want it to be able to drop it into Python's REPL,
>> it won't be compatible with JSON anyway! (Well, not unless you
>> define 'true' and 'false' first.)
>
> This is a new spec, so I guess the question is whether it's
> primarily "JSON with some more features" or "subset of Python syntax
> in the same way that JSON is a subset of JS". If it's the former,
> then yes, it'd use "true" and "false", and you'd have to define them;
> but if the latter, the spec would simply use "True" and "False". But
> being able to guarantee that JSON decodes correctly with this parser
> (ie make it a guaranteed superset of JSON) would be of value.
>
I've found that there's another issue with JSON: string escapes include
\u, but not \U:

 >>> json.dumps('\U0010FFFF')
'"\\udbff\\udfff"'

Yes, it uses surrogate escapes!

Also:

 >>> json.dumps('\uDBFF\uDFFF')
'"\\udbff\\udfff"'

so it won't round-trip.

On the other hand, you probably won't be using pairs of surrogate
escapes in Python 3.3+.