在 2020 年 10 月 10 日之後 pip3 install 會發生錯誤：
ERROR: After October 2020 you may experience errors when installing or updating packages. This is because pip will change the way that it resolves dependency conflicts.
We recommend you use --use-feature=2020-resolver to test your packages with the new resolver before it becomes the default.
astroid 2.4.2 requires lazy-object-proxy==1.4.*, but you'll have lazy-object-proxy 1.5.1 which is incompatible.解決方案：
$ pip3 install xxx --use-feature=2020-resolver本作品採用《CC 協議》，轉載必須註明作者和本文連結