ERROR: Cannot uninstall 'xxx'. It is a distutils installed project and thus we cannot accurately

今天安装 serial 时报错：

ERROR: Cannot uninstall 'PyYAML'. It is a distutils installed project and thus we
       cannot accurately determine which files belong to it which would lead to 
       only a partial uninstall .
错误：无法卸载“ PyYAML”。 这是一个distutils安装的项目，因此我们
        无法准确确定哪些文件属于该文件，这将导致
        仅部分卸载

我的环境：win10、py3.6

解决办法：

报错 Cannot uninstall 'abcd'，那就 pip install --ignore-installed abcd

因为我报错 Cannot uninstall 'PyYAML'，所以

pip install --ignore-installed pyyaml
#Successfully installed pyyaml-5.3.1
'安装完成后,再下载自己想要下载的包'
pip install serial
#Successfully installed iso8601-0.1.12 serial-0.0.97

就成功解决了。