Django执行makemigrations报错：找不到指定模块，无法定位错误文件

问题根源 #

这明显是代码粘贴失误导致的：INSTALLED_APPS里的'django.contrib.contenttyfrom datetime import timedelta',是把两个完全不相关的内容粘到一行了——正确的Django内置应用是django.contrib.contenttypes，而from datetime import timedelta是Python标准库的导入语句，根本不该出现在INSTALLED_APPS里。另外timedelta是Python自带的模块，不需要用pip安装。

修复步骤 #

• 找到项目中的settings.py文件（对应你的路径是/home/anton/Documents/project2/backend/my_backend/settings.py）
• 打开后定位到INSTALLED_APPS配置块，把错误的那行替换成：

  'django.contrib.contenttypes',
  

• 把from datetime import timedelta这行移到settings.py的顶部导入区域（和其他import语句放在一起），或者放到需要用到它的配置块中（比如使用DRF的JWT认证时，会在REST_FRAMEWORK配置里用到这个）
• 保存文件后，重新运行迁移命令：

  python manage.py makemigrations
  python manage.py migrate
  

错误详情 #

Traceback (most recent call last):
  File "/home/anton/Documents/project2/backend/my_backend/manage.py", line 22, in <module>
    main()
  File "/home/anton/Documents/project2/backend/my_backend/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/home/anton/Documents/project2/backend/pr2_venv/lib/python3.12/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
  File "/home/anton/Documents/project2/backend/pr2_venv/lib/python3.12/site-packages/django/core/management/__init__.py", line 416, in execute
    django.setup()
  File "/home/anton/Documents/project2/backend/pr2_venv/lib/python3.12/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/home/anton/Documents/project2/backend/pr2_venv/lib/python3.12/site-packages/django/apps/registry.py", line 91, in populate
    app_config = AppConfig.create(entry)
                 ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/anton/Documents/project2/backend/pr2_venv/lib/python3.12/site-packages/django/apps/config.py", line 193, in create
    import_module(entry)
  File "/usr/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1387, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1360, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1324, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'django.contrib.contenttyfrom datetime import timedelta'

原错误的INSTALLED_APPS配置 #

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttyfrom datetime import timedelta',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'rest_framework',
    'auth_app',
    'corsheaders'
]

内容的提问来源于stack exchange，提问作者Anton