Django启动报错AppRegistryNotReady的深度解析与解决方案

1. 问题现象与初步分析

遇到Django项目启动时抛出File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked...这类报错，很多开发者第一反应是Python环境出了问题。但实际这通常只是表象，真正的问题往往隐藏在调用栈的更深处。让我们先完整还原一个典型报错场景：

python复制Traceback (most recent call last):
  File "manage.py", line 22, in <module>
    main()
  File "manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/venv/lib/python3.9/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/venv/lib/python3.9/site-packages/django/core/management/__init__.py", line 395, in execute
    django.setup()
  File "/venv/lib/python3.9/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/venv/lib/python3.9/site-packages/django/apps/registry.py", line 91, in populate
    app_config = AppConfig.create(entry)
  File "/venv/lib/python3.9/site-packages/django/apps/config.py", line 213, in create
    import_module(module)
  File "/usr/