Google Calendar API v3的Python客户端库插入事件引发“缺少结束时间”错误

我在网上搜索了解决方案，但似乎我是唯一无法解决此问题的人。

这就是我的python代码：

class ReminderDate(object):
    def __init__(self, datetimestring, timezone="Australia/Sydney"):
        self.dateTime = datetimestring
        self.timeZone = timezone
class ReminderFormat(object):
    def __init__(self, useDefault=False):
        self.useDefault = useDefault
        self.overrides = [{"method":"email", "minutes":15}]
class ReminderData(object):
    def __init__(self, reminder, datefrom=None, dateto=None, datevalue=None):
        self.summary = reminder
        self.start = ReminderDate(datefrom)
        self.end = ReminderDate(dateto)
        self.reminders = ReminderFormat()

def save_event_to_google_calendar(self, reminder_data):
        credentials = self.get_credentials()
        service = build('calendar', 'v3', http=credentials.authorize(Http()))
        event = json.dumps(reminder_data, default=lambda o: o.__dict__)
        print (event)
        created_event = service.events().insert(calendarId=CALENDAR_ID, body=str(event), sendNotifications=True).execute()
        pp.pprint(created_event)

并且它产生因此print（event）输出一个json，如下所示：

{"start": {"timeZone": "Australia/Sydney", 
           "dateTime": "2015-04-26T18:45:00+10:00"}, 
 "end": {"timeZone": "Australia/Sydney", 
         "dateTime": "2015-04-26T19:00:00.000+10:00"}, 
 "reminders": {"overrides": [{"minutes": 15, "method": "email"}], 
               "useDefault": false}, 
 "summary": "do grocery shopping"}

我收到以下错误：

    File "/usr/local/lib/python2.7/dist-packages/googleapiclient/http.py", line 729, in execute
        raise HttpError(resp, content, uri=self.uri)
    googleapiclient.errors.HttpError: 
<HttpError 400 when requesting https://www.googleapis.com/calendar/v3/calendars/myemail%40gmail.com/events?alt=json&sendNotifications=true
 returned "Missing end time.">

我不明白。我在json中有“结束”时间。那我在这里想念什么？

我尝试通过Google开发人员控制台https://developers.google.com/google-apps/calendar/v3/reference/events/insert发布相同的json，并且它可以正常工作。但是它从python客户端库:(（如上所述）中失败了

[编辑]找到解决方案

问题是我已经将Python对象转换为JSON“字符串”，而这正是我所提供的，而不是API期望的JSON“对象”。所以这是正确的代码：

json_event = json.loads(event)
created_event = service.events().insert(calendarId=CALENDAR_ID, body=json_event, sendNotifications=True).execute()