python - 模型导入错误

Question

尝试将模型导入我的 Google App Engine 应用时遇到以下错误:

Traceback (most recent call last):
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 240, in Handle
handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 299, in _LoadHandler
handler, path, err = LoadObject(self._handler)
  File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 85, in LoadObject
obj = __import__(path[0])
  File "/base/data/home/apps/app/0-1.405524594589080344/main.py", line 6, in <module>
from BaseHandler import BaseHandler
  File "/base/data/home/apps/app/0-1.405524594589080344/BaseHandler.py", line 26, in <module>
from user.database import u_db
  File "/base/data/home/apps/app/0-1.405524594589080344/user/database/u_db.py", line 12, in <module>
from clubs.database import fed_db, league_db, club_db
  File "/base/data/home/apps/app/0-1.405524594589080344/clubs/database/fed_db.py", line 6, in <module>
from events.database import e_db
  File "/base/data/home/apps/app/0-1.405524594589080344/events/database/e_db.py", line 7, in <module>
from user.database import u_db
ImportError: cannot import name u_db

我重命名了模型文件及其容器文件夹，可以看到这与 Path 有关。

当我陷入困境时，我真的很感激能帮助解决这个问题。

谢谢。

Answer 1

您的模型中有循环依赖项，请在回溯中查看这些片段:

  File "/base/data/home/apps/app/0-1.405524594589080344/BaseHandler.py", line 26, in <module>
from user.database import u_db

...

  File "/base/data/home/apps/app/0-1.405524594589080344/events/database/e_db.py", line 7, in <module>
from user.database import u_db

你需要解决这个问题。通常，只需将 import 语句移至实际需要的函数内(而不是仅移至文件顶部)即可完成。但并非总是如此。