django.core.exceptions.ImproperlyConfigured: The included URLconf 's9luffycity.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused
2024-09-05 06:13:11
出现问题：
$ python manage.py runserver
启动项目报错时候
raise ImproperlyConfigured(msg.format(name=self.urlconf_name))
django.core.exceptions.ImproperlyConfigured: The included URLconf 's9luffycity.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is
probably caused by a circular import.
原因：
settings中的s9luffycity.url循环调用？？？
解决办法：
重新安装django
$ pip install django==2.2
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