TypeError: datetime.time(0, 0) is not JSON serializable解决办法

import json
import datetime

class DateEncoder(json.JSONEncoder):
    def default(self, obj):
        if isinstance(obj, datetime.datetime):
            return obj.strftime('%Y-%m-%d %H:%M:%S')
        elif isinstance(obj, datetime.date):
            return obj.strftime("%Y-%m-%d")
        elif isinstance(obj, datetime.time):
            return obj.strftime("%H-%M")
        else:
            return json.JSONEncoder.default(self, obj)

results_json = json.dumps(results_dict,cls=DateEncoder)