How Can I Encode Python Decimal Objects to JSON Accurately?

Encoding Decimal Objects to JSON in Python

JSON, a ubiquitous data interchange format, encounters challenges when dealing with Python's Decimal objects. To address this, we seek to serialize a Decimal('3.9') object to a JSON string that accurately represents the original value as {'x': 3.9}.

SimpleJSON to the Rescue

While Python's built-in JSON encoder cannot handle Decimals, a viable solution emerges with SimpleJSON, a third-party library. SimpleJSON version 2.1 and above boasts native support for the Decimal type. By leveraging the use_decimal parameter, we enable seamless serialization.

Here's an example:

import simplejson as json

result = json.dumps(Decimal('3.9'), use_decimal=True)
print(result)  # Output: '3.9'

By default, use_decimal is set to True, so the following command also produces the desired result:

result = json.dumps(Decimal('3.9'))
print(result)  # Output: '3.9'

It is noteworthy that SimpleJSON is expected to incorporate this functionality into Python's standard library.

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