Django报错RuntimeError: __class__ not set defining ‘AbstractBaseUser‘ as ＜class ‘django.contrib.auth.

学习参考《web接口开发自动化测试–基于Python语言》中，在python manage.py startapp sign时候报错：

RuntimeError: class not set defining ‘AbstractBaseUser’ as <class ‘django.contrib.auth.base_user.AbstractBaseUser’>. Was classcell propagated to type.new?

一顿度娘参考https://blog.youkuaiyun.com/grace666/article/details/103568674后（侵权立删），简单理了理步骤：

1. 找到文件base.py。如果前面是在cmd中安装django，则在Python的环境变量Path下，通过where python查询，python所在目录的\Lib\site-packages\django\db\models\，即D:\Python\Python38\Lib\site-packages\django\db\models\base.py。
   
2. 打开新增以下代码。ModelBase 类下或搜索：new_class 保存退出。

new_attrs = {'__module__': module}
        classcell = attrs.pop('__classcell__', None)
        if classcell is not None:
            new_attrs['__classcell__'] = classcell
        new_class = super_new(cls, name, bases,new_attrs)

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