请勿在应用程序外部进行设置。在 wsgi 文件中输入 DJANGO_SETTINGS_MODULE 变量。每次启动服务器时，都会自动设置此变量。

Do not set it from outside the application. Make a entry for DJANGO_SETTINGS_MODULE variable within your wsgi file. Everytime your server will be started, this variable will be set automatically.

例如：

import os
os.environ['DJANGO_SETTINGS_MODULE'] = '<project_name>.settings'