Ошибка при использовании облачного хранилища Google

Question

Я пытаюсь использовать Cloud Storage с App Engine. Но я получаю следующую ошибку.

Traceback (most recent call last): 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1535, in __call__ 
    rv = self.handle_exception(request, response, e) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1529, in __call__ 
    rv = self.router.dispatch(request, response) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1278, in default_dispatcher 
    return route.handler_adapter(request, response) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1102, in __call__ 
    return handler.dispatch() 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 572, in dispatch 
    return self.handle_exception(e, self.app.debug) 
    File "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 570, in dispatch 
    return method(*args, **kwargs) 
    File "/base/data/home/apps/s~sigmar-notes1/1.389052547617375726/main.py", line 47, in post 
    real_path = os.path.join('/', bucket_name, user.user_id(), file_name) 
    File "/base/data/home/runtimes/python27/python27_dist/lib/python2.7/posixpath.py", line 75, in join 
    if b.startswith('/'): 
AttributeError: 'NoneType' object has no attribute 'startswith' 

Я новичок в App Engine, и я использую код от «Python для Google App Engine» Массимилиано Пеппи. Вот код, который я использую.

class MainHandler(webapp2.RequestHandler): 

    def get(self): 
     user = users.get_current_user() 
     template_context = {} 

     if user is not None: 
      logout_url = users.create_logout_url(self.request.uri) 
      template_context = { 
       'user': user.nickname(), 
       'logout_url': logout_url, 
      } 
      template = jinja_env.get_template('main.html') 
      self.response.out.write(template.render(template_context)) 

     else: 
      login_url = users.create_login_url(self.request.uri) 
      self.redirect(login_url) 

    def post(self): 
     user = users.get_current_user() 
     if user is None: 
      self.error(401) 

     bucket_name = app_identity.get_default_gcs_bucket_name() 
     uploaded_file = self.request.POST.get('uploaded_file') 
     file_name = getattr(uploaded_file, 'filename', None) 
     file_content = getattr(uploaded_file, 'file', None) 
     real_path = '' 
     if file_name and file_content: 
      content_t = mimetypes.guess_type(file_name)[0] 
      real_path = os.path.join('/', bucket_name, user.user_id(), file_name) 

      with cloudstorage.open(real_path, 'w', content_type=content_t) as f: 
       f.write(file_content.read()) 

     self._create_note(user, file_name) 

     logut_url = users.create_logout_url(self.request.uri) 
     template_context = { 
      'user': user.nickname(), 
      'logout_url': logut_url, 
      'note_title': self.request.get('title'), 
      'note_content': self.request.get('content'), 
     } 
     self.response.out.write(self._render_template('main.html', template_context)) 

    def _render_template(self, template_name, context=None): 
     if context is None: 
      context = {} 

     user = users.get_current_user() 
     ancestor_key = ndb.Key("User", user.nickname()) 
     gry = Note.owner_query(ancestor_key) 
     context['notes'] = gry.fetch() 

     template = jinja_env.get_template(template_name) 
     return template.render(context) 

    @ndb.transactional 
    def _create_note(self, user, file_name): 
     note = Note(parent=ndb.Key("User", user.nickname()), title=self.request.get('title'), content=self.request.get('content')) 
     note.put() 

     item_titles = self.request.get('checklist_items').split(',') 
     for item_title in item_titles: 
      item = CheckListItem(parent=note.key, title=item_title) 
      item.put() 
      note.checklist_items.append(item.key) 

     if file_name: 
      note.files.append(file_name) 

     note.put() 

Answer 1

Один из ваших аргументов os.path.join вызова None:

real_path = os.path.join('/', bucket_name, user.user_id(), file_name) 

Answer 2

Оказалось, что ведро по умолчанию не было создано. Чтобы создать его, мне пришлось использовать старую консоль приложений. Вот ссылка на solution