【发布时间】：2021-05-07 23:31:30
【问题描述】：
我阅读了有关该错误的解决方案（写 import 而不是 from ...）但我认为它不起作用，因为我有一个复杂的文件夹结构。
quiz.models
import apps.courses.models as courses_models
courses_models.Lesson # some actions with that class
class Quiz:
pass
课程.模型
import apps.quiz.models as quiz_models
quiz_models.Quiz # some actions with that class
class Lesson:
pass
错误：
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 "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
utility.execute()
File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 377, in execute
django.setup()
File "/usr/local/lib/python3.8/site-packages/django/__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "/usr/local/lib/python3.8/site-packages/django/apps/registry.py", line 114, in populate
app_config.import_models()
File "/usr/local/lib/python3.8/site-packages/django/apps/config.py", line 211, in import_models
self.models_module = import_module(models_module_name)
File "/usr/local/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 975, in _find_and_load_unlocked
File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
File "<frozen importlib._bootstrap_external>", line 848, in exec_module
File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
File "/code/apps/carts/models.py", line 5, in <module>
from ..courses.models import Course
File "/code/apps/courses/models.py", line 12, in <module>
import apps.quiz.models as quiz_models
File "/code/apps/quiz/models.py", line 12, in <module>
class Quiz(TimestampedModel):
File "/code/apps/quiz/models.py", line 15, in Quiz
courses_models.Lesson, default=1, on_delete=models.DO_NOTHING, verbose_name=_('Lesson'), related_name='quizzes')
AttributeError: partially initialized module 'apps.courses.models' has no attribute 'Lesson' (most likely due to a circular import)
也许您有其他循环导入的解决方案，或者我只是将导入写错了？
【问题讨论】：
-
这能回答你的问题吗？ Circular import dependency in Python
-
如果模块 A 导入模块 B，则 B，即其中的所有代码，在 A 导入时执行。如果 B 中的代码引用了 A 中的一个对象，因为 A 的执行仍在第 1 行的
import B语句处，但该对象的定义在 A 的第 322 行，所以该对象尚未定义，那么您将循环导入失败。您无法更改编写import语句的方式来修复它。要么结合2个模块；或（如果可能）推迟import B直到 A 定义 B 所指的对象之后；或者将相互依赖的代码移到自己的模块中。 -
如果你知道 Django 请检查一下，这是我的详细问题stackoverflow.com/questions/67446192/…