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  1. import json
  2.  
  3. class FloatEncoder(json.JSONEncoder):
  4.  
  5.     def __init__(self, nan_str = "null", **kwargs):
  6.         super(FloatEncoder,self).__init__(**kwargs)
  7. 	self.nan_str = nan_str
  8.  
  9.     #uses code from official python json.encoder module. Same licence applies.
  10.     def iterencode(self, o, _one_shot=False):
  11.         """Encode the given object and yield each string
  12.         representation as available.
  13.  
  14.         For example::
  15.  
  16.             for chunk in JSONEncoder().iterencode(bigobject):
  17.                 mysocket.write(chunk)
  18.  
  19.         """
  20.         if self.check_circular:
  21.             markers = {}
  22.         else:
  23.             markers = None
  24.         if self.ensure_ascii:
  25.             _encoder = json.encoder.encode_basestring_ascii
  26.         else:
  27.             _encoder = json.encoder.encode_basestring
  28.         if self.encoding != 'utf-8':
  29.             def _encoder(o, _orig_encoder=_encoder, _encoding=self.encoding):
  30.                 if isinstance(o, str):
  31.                     o = o.decode(_encoding)
  32.                 return _orig_encoder(o)
  33.  
  34.         def floatstr(o, allow_nan=self.allow_nan,
  35.                 _repr=json.encoder.FLOAT_REPR, _inf=json.encoder.INFINITY, _neginf=-json.encoder.INFINITY, nan_str = self.nan_str):
  36.             # Check for specials.  Note that this type of test is processor
  37.             # and/or platform-specific, so do tests which don't depend on the
  38.             # internals.
  39.  
  40.             if o != o:
  41.                 text = nan_str
  42.             elif o == _inf:
  43.                 text = 'Infinity'
  44.             elif o == _neginf:
  45.                 text = '-Infinity'
  46.             else:
  47.                 return _repr(o)
  48.  
  49.             if not allow_nan:
  50.                 raise ValueError(
  51.                     "Out of range float values are not JSON compliant: " +
  52.                     repr(o))
  53.  
  54.             return text
  55.  
  56.         _iterencode = json.encoder._make_iterencode(
  57.                 markers, self.default, _encoder, self.indent, floatstr,
  58.                 self.key_separator, self.item_separator, self.sort_keys,
  59.                 self.skipkeys, _one_shot)
  60.         return _iterencode(o, 0)
  61.  
  62.  
  63. example_obj =  {'name': 'example', 'body': [1.1, {"3.3": 5, "1.1": float('Nan')}, [float('inf'), 2.2]]}
  64. print json.dumps(example_obj, cls=FloatEncoder)
Success #stdin #stdout 0.02s 8180KB
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{"body": [1.1, {"3.3": 5, "1.1": null}, [Infinity, 2.2]], "name": "example"}
https://ideone.com/dFWaNj
language:
Python (cpython 2.7.16)
created:
10 years ago
visibility:
secret

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