https://docs.djangoproject.com/en/2.1/topics/class-based-views/mixins/
E:\ProgramData\Anaconda3\envs\py3\Lib\site-packages\django\views\generic\detail.py
E:\ProgramData\Anaconda3\envs\py3\Lib\site-packages\django\views\generic\list.py
E:\ProgramData\Anaconda3\envs\py3\Lib\site-packages\django\views\generic\base.py
原文：https://www.cnblogs.com/my8100/p/django_detailview.html