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在用Django注册superuser时出现了如下问题：
django.db.utils.IntegrityError: (1048, "Column 'level' cannot be null")
往上查询可以看到
MySQLdb._exceptions.OperationalError: (1048, "Column 'level' cannot be null")
说明在注册superuser的过程中，把超级用户信息更新到MySQL中时，user表中的level不能为空。
这时可以通过数据库Crtl+D直接把level一栏的“不是null”中的√去掉，但是这种方法有个问题是，如果后期要对Django中models的用户信息进行修改的时候，重新执行python
manage.py migrate 后会导致数据表中level后面的√重新打上。
所以建议直接对models中的用户信息进行修改，添加null=True后，重新执行python manage.py
migrate操作，然后再设置superuser。
class User(AbstractUser): """ 用户的基础信息表 """ # username =
models.CharField('用户名', max_length=64) # password = models.CharField('密码',
max_length=255) avatar = models.ImageField('用户头像', upload_to='avatar',
null=True, blank=True) nickname = models.CharField('昵称', max_length=32) level =
models.SmallIntegerField('用户级别', null=True)
重新执行
>>> python manage.py makemigrations >>> python manage.py migrate >>> python
manage.py createsuperuser
