ERROR: After October 2020 you may experience errors when installing or updating packages

问题描述: 使用pip安装模块时报错: 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.

解决方法: 在pip命令中加入–use-feature=2020-resolver参数就可以了, 比如pip install xxx --use-feature=2020-resolver