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

今天安裝 serial 時報錯：

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 .
錯誤：無法卸載“ PyYAML”。 這是一個distutils安裝的項目，因此我們
        無法準確確定哪些文件屬於該文件，這將導致
        僅部分卸載

我的環境：win10、py3.6

解決辦法：

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

因爲我報錯 Cannot uninstall 'PyYAML'，所以

pip install --ignore-installed pyyaml
#Successfully installed pyyaml-5.3.1
'安裝完成後,再下載自己想要下載的包'
pip install serial
#Successfully installed iso8601-0.1.12 serial-0.0.97

就成功解決了。