Django Error:1091 can't drop 'na

https://www.cnblogs.com/wangkun122/articles/10407415.html

删除migrati 下面所有文件

把项目重新复制一份出来，然后重新migrate

python-Bug3：You are trying to add a non-nullable field 'password' to userinfo without a default问题：

https://blog.csdn.net/qq_27695659/article/details/85179932