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我正在使用 Django 3.2。我想开始使用 Django contrib 用户模块https://docs.djangopct.com/en/3.2/topics/auth/，但在导入基本 User 类时遇到问题。我试过这个

davea$ venv/bin/python3
Python 3.9.1 (v3.9.1:1e5d33e9b9, Dec  7 2020, 12:44:01) 
[Clang 12.0.0 (clang-1200.0.32.27)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> import os
>>> os.environ.setdefault("DJANGO_SETTINGS_MODULE", "directory.settings")
'directory.settings'
>>> from django.contrib.auth.models import User
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/davea/Documents/workspace/chicommons/maps/web/venv/lib/python3.9/site-packages/django/contrib/auth/models.py", line 2, in <module>
    from django.contrib.auth.base_user import AbstractBaseUser, BaseUserManager
  File "/Users/davea/Documents/workspace/chicommons/maps/web/venv/lib/python3.9/site-packages/django/contrib/auth/base_user.py", line 48, in <module>
    class AbstractBaseUser(models.Model):
  File "/Users/davea/Documents/workspace/chicommons/maps/web/venv/lib/python3.9/site-packages/django/db/models/base.py", line 108, in __new__
    app_config = apps.get_containing_app_config(module)
  File "/Users/davea/Documents/workspace/chicommons/maps/web/venv/lib/python3.9/site-packages/django/apps/registry.py", line 253, in get_containing_app_config
    self.check_apps_ready()
  File "/Users/davea/Documents/workspace/chicommons/maps/web/venv/lib/python3.9/site-packages/django/apps/registry.py", line 136, in check_apps_ready
    raise AppRegistryNotReady("Apps aren't loaded yet.")
django.core.exceptions.AppRegistryNotReady: Apps aren't loaded yet.

我不清楚“django.core.exceptions.AppRegistryNotReady：应用程序尚未加载”是什么意思或如何解决它。

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