Question

我已经在Python中为Google App Engine构建了一个Web应用程序。这是成熟的代码，我已经运行了很多次没有任何问题。然而，当我今天早上做出一些改变时，整个地方都出现了神秘的空白错误。在弄清整个文本文件（在TextWrangler中）并将我的设置更改为自动展开选项卡之前，我弄清楚了发生了什么并手动删除了一些。我想我已经赶走了所有的错误。当我在我的文件上运行python -m tabnanny时，我没有报告错误。

但是，之前一大堆代码中出现了一个新的错误。我不知道错误是在类或它正在调用的类中，所以我在下面包含了一大块代码。 GAE日志中的错误消息如下：

<type 'exceptions.NameError'>: name 'self' is not defined
Traceback (most recent call last):
  File "/base/data/home/apps/lpflipstud/1.354982193405081399/example.py", line 99, in <module>
    class HomeHandler(BaseHandler):
  File "/base/data/home/apps/lpflipstud/1.354982193405081399/example.py", line 103, in HomeHandler
    logging.info(self.current_user)

这是代码。它是facebook为Google App Engine界面提供的示例代码的略微修改版本，带有facebook应用程序：

class BaseHandler(webapp.RequestHandler):
#Provides access to the active Facebook user in self.current_user.
#The property is lazy-loaded on first access, using the cookie saved  
#by the Facebook JavaScript SDK to determine the user ID of the active
#user. See http://developers.facebook.com/docs/authentication/ for
#more information.
    @property
    def current_user(self):
        if not hasattr(self, "_current_user"):
            self._current_user = None
            cookie = facebook.get_user_from_cookie(
                self.request.cookies, FACEBOOK_APP_ID, FACEBOOK_APP_SECRET)
            if cookie:
                # Store a local instance of the user data so we don't need
                # a round-trip to Facebook on every request
                user = User.get_by_key_name(cookie["uid"])
                if not user:
                    graph = facebook.GraphAPI(cookie["access_token"])
                    profile = graph.get_object("me")
                    id=str(profile["id"])
                    at = cookie["access_token"]
                    user = User(key_name=str(profile["id"]),
                                id=str(profile["id"]),
                                name=profile["name"],
                                profile_url=profile["link"],
                                access_token=cookie["access_token"])
                    user.put()
                elif user.access_token != cookie["access_token"]:
                    user.access_token = cookie["access_token"]
                    user.put()
        #add list of friend ids
        tic = time.clock()
        url = "https://graph.facebook.com/"+user.id+"/friends?   access_token="+user.access_token
        response = urllib2.urlopen(url)
        fb_response = response.read()
        x = re.findall(r'"\d+"',fb_response)
        friend_list = [a.strip('"') for a in x]
        user.friends = friend_list
        toc = time.clock()
        t = toc - tic
        user.put()  
        self._current_user = user
        return self._current_user

class HomeHandler(BaseHandler):
    def get(self):
        path = os.path.join(os.path.dirname(__file__), "homepage.html")

    logging.info(self.current_user)

Answer 1

logging.info(self.current_user)超出了定义self的任何范围（并且会在创建类时运行，这可能不是您想要的）。你需要在一个方法中调用它，例如

def get(self):
    path = ...
    logging.info(self.current_user)

在GA的Python中，“name'self'未定义”错误消息

1 个答案: