Encoding NaN in JSON

[Dave Angel]

On 04/17/2013 03:05 PM, Johann Hibschman wrote:
> Miki Tebeka <miki.tebeka at gmail.com> writes:
>
>>>> I'm trying to find a way to have json emit float('NaN') as 'N/A'.
>>> No.  There is no way to represent NaN in JSON.  It's simply not part of the
>>> specification.
>> I know that. I'm trying to emit the *string* 'N/A' for every NaN.
>
> Easiest way is probably to transform your object before you try to write
> it, e.g.
>
>    def transform(x):
>        if isinstance(x, dict):
>            return dict((k, transform(v)) for k, v in x.items())
>        elif isinstance(x, list) or isinstance(x, tuple):
>            return [transform(v) for v in x]
>        elif isinstance(x, float) and x != x:
>            return 'N/A'
>        else:
>            return x
>

Note that for a self-referencing object, this function might run 
"forever," or until it runs out of stack.  The programmer is likely to 
know about the possibility, but just in case ...

> Then just use
>
>    json.dumps(transform(x))
>
> rather than just
>
>    json.dumps(x)
>


-- 
DaveA