json_serial.py

from datetime import date, datetime
from decimal import Decimal

def json_serial(obj):
    """Helps json.dumps render datetime objects"""
    if isinstance(obj, date):
        return obj.isoformat()[:10]
    if isinstance(obj, datetime):
        return obj.isoformat()[:10]
    if isinstance(obj, Decimal):
        return f'{obj.normalize():f}'
    raise TypeError(f"Type {type(obj)} not serializable")