Return json-friendly version of a data structure in Django project

json_friendly.py

import datetime
import decimal
import uuid

from django.utils.duration import duration_iso_string
from django.utils.functional import Promise
from django.utils.timezone import is_aware


def json_friendly(o):
    """
    Return a JSON-friendly version of the provided value.
    Based on code of `django.core.serializers.json.DjangoJSONEncoder.default`.
    """
    if isinstance(o, datetime.datetime):
        r = o.isoformat()
        if o.microsecond:
            r = r[:23] + r[26:]
        if r.endswith('+00:00'):
            r = r[:-6] + 'Z'
        return r
    elif isinstance(o, datetime.date):
        return o.isoformat()
    elif isinstance(o, datetime.time):
        if is_aware(o):
            raise ValueError("JSON can't represent timezone-aware times.")
        r = o.isoformat()
        if o.microsecond:
            r = r[:12]
        return r
    elif isinstance(o, datetime.timedelta):
        return duration_iso_string(o)
    elif isinstance(o, (decimal.Decimal, uuid.UUID, Promise)):
        return str(o)
    elif isinstance(o, dict):
        return {key: json_friendly(value) for key, value in o.items()}
    else:
        return o