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From: Johann Hibschman <jhibschman@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Encoding NaN in JSON
Date: Wed, 17 Apr 2013 14:05:30 -0500
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Miki Tebeka <miki.tebeka@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

Then just use

  json.dumps(transform(x))

rather than just

  json.dumps(x)