Django：導入錯誤：無法從“芹菜”導入名稱“芹菜”

Question

所以我已經安裝了celery並在我的項目目錄中的settings.py旁邊得到了文件celery_tasks_settings.py 。 我得到的這是一種避免與包本身發生沖突的方法。

我也做了

find -name '*celery*.pyc'

作為查找celery.pyc可能已生成的任何celery.pyc文件的一種方式。結果：

/__pycache__/celery_tasks.cpython-38.pyc
/__pycache__/celery_tasks_settings.cpython-38.pyc

不幸的是，我仍然遇到同樣的錯誤：

   from celery import Celery
ImportError: cannot import name 'Celery' from 'celery' 

難道我做錯了什么？

PS：我也繼續嘗試添加：

from __future__ import absolute_import, unicode_literals

到我的celery_tasks_settings.py

我的錯誤仍然不會改變。 [編輯] 完整回溯

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/core/management/base.py", line 336, in run_from_argv
    connections.close_all()
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/db/utils.py", line 219, in close_all
    for alias in self:
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/db/utils.py", line 213, in __iter__
    return iter(self.databases)
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/db/utils.py", line 147, in databases
    self._databases = settings.DATABASES
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/HotelManagement/__init__.py", line 4, in <module>
    from .celery_tasks_settings import app as celery_app
  File "/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/HotelManagement/celery_tasks_settings.py", line 4, in <module>
    from celery import Celery
ImportError: cannot import name 'Celery' from 'celery' (/run/media/marvin/DriveEtCetera/Python/MyProjectsDirectory/super-lamp/.superlamp/lib/python3.8/site-packages/celery/__init__.py)

Answer 1

我將 importlib-metadata 從 0.19 版升級到 1.5.0 版，它完全為我解決了這個問題。

作為參考，我有一個幾乎相同的完整回溯：

Traceback (most recent call last):
  File "manage.py", line 21, in <module>
    main()
  File "manage.py", line 17, in main
    execute_from_command_line(sys.argv)
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/core/management/__init__.py", line 375, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/core/management/base.py", line 336, in run_from_argv
    connections.close_all()
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/db/utils.py", line 219, in close_all
    for alias in self:
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/db/utils.py", line 213, in __iter__
    return iter(self.databases)
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/utils/functional.py", line 80, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/db/utils.py", line 147, in databases
    self._databases = settings.DATABASES
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 783, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/mnt/SSD/uvo/help/voiceover_backend/voiceover_backend/__init__.py", line 5, in <module>
    from .celery import app as celery_app
  File "/mnt/SSD/uvo/help/voiceover_backend/voiceover_backend/celery.py", line 3, in <module>
    from celery import Celery
ImportError: cannot import name 'Celery' from 'celery' (/mnt/SSD/uvo/help/voiceover_backend/env/lib/python3.8/site-packages/celery/__init__.py)

當我升級 importlib-metadata 時，它完全修復了。

pip install --upgrade importlib-metadata

Answer 2

這可能是一個循環導入問題。 看起來您正在嘗試在 celery_task_settings.py 中導入Celery ，這導致循環導入導致導入錯誤。