老师，我按照你的步骤一步一步下来操作，但最后报错数据时出现下面错误：IntegrityError at /index/ NOT NULL constraint failed: login_userinfo.pwd Request Method: POST Request URL: http://localhost:8000/index/ Django Version: 3.0.4 Exception Type: IntegrityError Exception Value: NOT NULL constraint failed: login_userinfo.pwd Exception Location: D:\Program Files\Python\lib\site-packages\django\db\backends\sqlite3\base.py in execute, line 396 Python Executable: D:\Program Files\Python\python.exe Python Version: 3.7.4 Python Path: ['F:\\My_django\\mysite', 'F:\\My_django\\mysite', 'D:\\Program Files\\JetBrains\\PyCharm 2019.2.6\\helpers\\pycharm_display', 'D:\\Program Files\\Python\\python37.zip', 'D:\\Program Files\\Python\\DLLs', 'D:\\Program Files\\Python\\lib', 'D:\\Program Files\\Python', 'C:\\Users\\Administrator\\AppData\\Roaming\\Python\\Python37\\site-packages', 'D:\\Program Files\\Python\\lib\\site-packages', 'D:\\Program Files\\Python\\lib\\site-packages\\win32', 'D:\\Program Files\\Python\\lib\\site-packages\\win32\\lib', 'D:\\Program Files\\Python\\lib\\site-packages\\Pythonwin', 'D:\\Program Files\\JetBrains\\PyCharm ' '2019.2.6\\helpers\\pycharm_matplotlib_backend'] Server time: Fri, 20 Mar 2020 08:13:49 +0000