出现python包版本过低的问题，使用 pip install --ignore-installed 包名，就可以解决问题了。 ERROR: packaging 20.4 has requirement pyparsing>=2.0.2, but you'll have pyparsing 1.5.6 which is incompatible.

使用代码：

pip install --ignore-installed pyparsing

出现python包不能卸载的问题，使用 pip install --ignore-installed 包名，就可以解决问题了。就会重新安装最新的包 ERROR: Cannot uninstall 'requests'. 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.

使用代码：

pip install --ignore-installed requests