datetime is not json serializable

python， datetime is not json serializable

import datetime

def json_serial(obj):
    """JSON serializer for objects not serializable by default json code"""

    if isinstance(obj, (datetime.datetime, datetime.date)):
        return obj.isoformat()
    raise TypeError("Type %s not serializable" % type(obj))

示例代码：

from datetime import datetime
from json import dumps

print dumps(datetime.now(), default=json_serial)

ref：https://stackoverflow.com/questions/11875770/how-to-overcome-datetime-datetime-not-json-serializable