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json.dumps with datetime, date and bson.ObjectId support

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json.dumps with datetime, date and bson.ObjectId support

>>> from datetime import datetime, date, timedelta, timezone
>>> from decimal import Decimal
>>> from bson import ObjectId
>>> import asjson
>>> data = {
...     'time': [
...         date(2018, 3, 6),
...         datetime(2018, 3, 6, 9, 38, 0, 1),
...         datetime(2018, 3, 6, 9, 38, 0, 1).replace(
...             tzinfo=timezone.utc),
...     ],
...     'decimal': Decimal('3.14'),
...     'objectid': ObjectId('a' * 24),
... }

We can make all the values json-appropriate without dumping the structure to string. It can be helpful in some cases, e.g. with passing it into database json field.

>>> asjson.encode(data)
{'time': ['2018-03-06',
     'decimal': '3.14',
     'objectid': 'aaaaaaaaaaaaaaaaaaaaaaaa'}

For dumping to string we can use asjson.dumps which takes the same parameters as standard json.dumps does plus debug which just a shortcut for json.dumps(…, indent=4, sort_keys=True, ensure_askii=False):

>>> print(asjson.dumps(data, debug=True))
    "decimal": "3.14",
    "objectid": "aaaaaaaaaaaaaaaaaaaaaaaa",
    "time": [

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