PythonAnywhere上Django应用加载报错：No module named 'simple_history'

问题重现 #

已在PythonAnywhere部署Django应用，安装了requirements.txt依赖，python manage.py migrate执行成功，但重载应用时出现以下错误：

2023-09-29 00:42:43,481: Error running WSGI application
2023-09-29 00:42:43,514: ModuleNotFoundError: No module named 'simple_history'
2023-09-29 00:42:43,514:   File "/var/www/app_umrahpro_me_wsgi.py", line 16, in <module>
2023-09-29 00:42:43,514:     application = get_wsgi_application()
2023-09-29 00:42:43,514: 
2023-09-29 00:42:43,514:   File "/home/HBNmughal/.local/lib/python3.10/site-packages/django/core/wsgi.py", line 12, in get_wsgi_application
2023-09-29 00:42:43,515:     django.setup(set_prefix=False)
2023-09-29 00:42:43,515: 
2023-09-29 00:42:43,515:   File "/home/HBNmughal/.local/lib/python3.10/site-packages/django/__init__.py", line 24, in setup
2023-09-29 00:42:43,515:     apps.populate(settings.INSTALLED_APPS)
2023-09-29 00:42:43,515: 
2023-09-29 00:42:43,515:   File "/home/HBNmughal/.local/lib/python3.10/site-packages/django/apps/registry.py", line 91, in populate
2023-09-29 00:42:43,516:     app_config = AppConfig.create(entry)
2023-09-29 00:42:43,516: 
2023-09-29 00:42:43,516:   File "/home/HBNmughal/.local/lib/python3.10/site-packages/django/apps/config.py", line 193, in create
2023-09-29 00:42:43,516:     import_module(entry)

解决方案 #

该问题核心原因是WSGI进程使用的Python环境与依赖安装环境不一致，按以下步骤修复：

• 确认依赖安装的Python版本：在终端执行pip --version，查看输出的Python版本（如python 3.10），确保和WSGI配置中指定的版本匹配。
• 定向安装依赖：如果版本不匹配或环境仍有问题，直接指定Python版本安装模块：

  python3.10 -m pip install django-simple-history
  

  替换python3.10为你实际使用的Python版本。
• 检查WSGI配置文件：打开/var/www/app_umrahpro_me_wsgi.py，确认项目路径正确；如果使用了虚拟环境，确保激活虚拟环境的代码未被注释且路径准确：

  # 示例虚拟环境激活代码（按需启用）
  activate_this = '/home/HBNmughal/venv/bin/activate_this.py'
  with open(activate_this) as file_:
      exec(file_.read(), dict(__file__=activate_this))
  

• 重载应用：完成上述操作后，回到PythonAnywhere的Web控制台点击"Reload"按钮重新加载应用。

内容的提问来源于stack exchange，提问作者HBNmughal