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JSON Decimal encoder

Author:
roxeteer
Posted:
April 12, 2011
Language:
Python
Version:
Not specified
Score:
1 (after 1 ratings)

Python json module or simplejson don't support Decimals out of the box. Here's an encoder that casts Decimals into floats and then displays them in desired format.

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import json
from decimal import Decimal

class DecimalEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, Decimal):
            return float(obj)
        return json.JSONEncoder.default(self, obj)

# Output has one decimal, change format if you need more
json.encoder.FLOAT_REPR = lambda o: format(o, '.1f')

# Usage:
d = Decimal("42.5")
json.dumps(d, cls=DecimalEncoder)

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