python判断是否json格式

def check_json_format(raw_msg):
 if isinstance(raw_msg, str):  # 首先判断变量是否为字符串
  try:
   json.loads(raw_msg, encoding='utf-8')
  except ValueError:
   return False
  return True
 else:
  return False

def yyyyyyy(request):
    #payload={"name":"123","sex":"bbb"}
    payload = {
        "event_type": "active_pay",
        "context": {"ad": {"callback": "clickid"}},
        "timestamp": timestamp
    }

    print(check_json_format(json.dumps(payload)))

    return HttpResponse(json.dumps(payload))