TypeError：“NoneType”对象在将 JSON 分配给 python 变量的 GAE 实例上不可下标

Question

在将 JSON 分配给像 sheet_id = data["sheetID"] 这样的 python 变量时，我收到错误 TypeError: 'NoneType' object is not subscriptable。 它只发生在我的 Google App Engine 实例上。在本地运行我的 Flask 应用程序并使用 Postman 向应用程序发送 POST 请求时，我没有得到它。这是代码sn-p

@app.route('/main',methods=["POST"])
def main():
    data = request.json
    print(data)
    scope = [
    'https://www.googleapis.com/auth/spreadsheets',
    'https://www.googleapis.com/auth/gmail.send',
    'https://www.googleapis.com/auth/gmail.settings.basic',
    'https://www.googleapis.com/auth/gmail.settings.sharing'
    ]

    GCP_PROJECT = os.environ['GCP_PROJECT']
    GAE_SID_VERSION = os.environ['GAE_SID_VERSION']


    credentials1 = access_secret_version(GCP_PROJECT, <SECRET NAME>, GAE_SID_VERSION)
    credentials1 = json.loads(credentials1)
    credentials = service_account.Credentials.from_service_account_info(credentials1)
    scoped_credentials = credentials.with_scopes(scope)
    gc = gspread.authorize(scoped_credentials)

    #for sheet with categories and score
    sheet_id = data["sheetID"] #this gives me the error

    workbook = gc.open_by_key(sheet_id)
    ...

    ...
    return "OK"

奇怪的是整个程序运行完成，我收到response = OK。我可以将 json 数据从 Google 表格中的触发脚本发送到我的 GAE 实例，然后 GAE 实例稍后将数据加载到 Gcloud 存储桶中。我从this link 了解到data 或sheet_id 可能是None，但在这种情况下，我的整个程序将如何运行完成甚至只是打开工作簿？这是 Google Apps 脚本

function runDockerImage(sheetID , mainWorksheet , emailTo , emailList , deliverToCloud ,filterOn , labelDisplay , sandbox , deliverToSlack) {
  // The code below logs the HTML code of the Google home page.
  var dataJSON = {
    'sheetID' :sheetID,
    'mainWorksheet' : mainWorksheet,
    'emailTo' : emailTo,
    'emailList' : emailList,
    'deliverToCloud' : deliverToCloud,
    'filterOn' : filterOn,
    'labelDisplay': labelDisplay,
    'sandbox' : sandbox,
    'deliverToSlack' : deliverToSlack 
    
  };
  
  payload = JSON.stringify(dataJSON)
  
  var headers = {
    'Accept': 'application/json',
    'Content-Type': 'application/json',
    'Authorization': 'Basic _authcode_'
  };
  
  var options = {
     'method': 'post',
     'contentType': 'application/json',
     'headers': headers,
     'payload': payload
  };
  
  
  var response = UrlFetchApp.fetch('https://<project-id>.uc.r.appspot.com/main', options);
  Logger.log(response);
 
}

这是来自 App Engine 错误报告日志的追溯：

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib/python3.6/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.6/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/app/app.py", line 118, in main
    sheet_id = data["sheetID"]
TypeError: 'NoneType' object is not subscriptable

最后，我想问一下，这个程序怎么可能完全运行并出现这个错误？我想如果我不解决这个问题，我以后可能会遇到一些严重的问题。

错误报告日志的屏幕截图

Answer 1

错误表示data是None

$ python3
Python 3.8.3 (v3.8.3:6f8c8320e9, May 13 2020, 16:29:34) 
[Clang 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> d=None
>>> d['3']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not subscriptable

奇怪的是整个程序运行完成，我收到响应= OK。

您确定没有错误处理程序或返回 OK 的东西，即使请求处理程序抛出异常？

另外，你为什么要这样做？

dataJSON = request.json
json_string = json.dumps(dataJSON)
data = json.loads(json_string)

request.json 将 json 请求有效负载作为 python dict 提供给您，但随后您将其转换为 json 字符串，然后再次将其解析为 python dict。你应该可以做到data = request.json