JSON encoder for standard Python json package

jsonencoder.py

import codecs
import json
import datetime
from uuid import UUID

class UniversalEncoder(json.JSONEncoder):
    def default(self, obj):

        if isinstance(obj, (datetime.datetime, datetime.date, datetime.time)):
            return obj.isoformat()
        if isinstance(obj, datetime.timedelta):
            return (datetime.datetime.min + obj).time().isoformat()
        if isinstance(obj, datetime.date):
            return obj.strftime('%Y%m%d')
        if isinstance(obj, datetime.time):
            return obj.isoformat()
        if isinstance(obj, datetime.timedelta):
            return '{} days, {} seconds, {} microseconds'.format(obj.days, obj.seconds, obj.microseconds)
        if isinstance(obj, float):
            return str(obj)
        if isinstance(obj, (set, tuple)):
            return list(obj)
        if isinstance(obj, UUID):
            return obj.hex
        if isinstance(obj, bytes):
            for encoding in ('utf-8', 'ISO8859-1'):
                try:
                    print('try {}'.format(encoding))
                    return obj.decode(encoding)
                except UnicodeDecodeError:
                    continue
            # In JSON, this will come out as "\\xaa\\xbb"
            return ''.join([r'\x{:x}'.format(obj[i]) for i in range(0, len(obj))])

        return super().default(obj)

from json import dumps
x = {}
print(dumps(x, cls=UniversalEncoder))