Django运行报错：django.core.exceptions.ImproperlyConfigured

Django运行报错

django.core.exceptions.ImproperlyConfigured: Requested setting INSTALLED_APPS, but settings are not configured. You must either define the environment variable DJANGO_SETTINGS_MODULE or call settings.configure() before accessing settings.

发现pycharm 右上角选择运行的文件错误，应该选择dj项目

由

修改成

 

再次运行就不会报错了