macOS中的Django报错SyntaxError: Generator expression must be parenthesized (widgets.py, line 151

本人先是上网搜索了解决方法，说是python3.7和Django1.11不兼容。但本机环境为python3.8+Django1.11.6。

执行python manage.py runserver报错：

  File "/Users/localadmin/opt/anaconda3/envs/202011py38/lib/python3.8/site-packages/django/contrib/admin/options.py", line 12, in <module>
    from django.contrib.admin import helpers, widgets
SyntaxError: Generator expression must be parenthesized (widgets.py, line 151)
Performing system checks...

System check identified no issues (0 silenced).

然后打开了widgets.py所在位置，大概为：/Users/localadmin/opt/anaconda3/lib/python3.8/site-packages/django/contrib/admin/widgets.py

将151行末尾的逗号删掉即可