本文记录了使用pip安装工具升级pip版本的过程。通过缓存文件安装了pip-9.0.1版本，覆盖了原有的8.1.1版本。注意由于权限问题，未卸载旧版本。
root@xxx:/home/czz# pip3 install --upgrade pip
Collecting pip
Using cached pip-9.0.1-py2.py3-none-any.whl
Installing collected packages: pip
Found existing installation: pip 8.1.1
Not uninstalling pip at /usr/lib/python3/dist-packages, outside environment /usr
Successfully installed pip-9.0.1
root@xxx:/home/czz#
Collecting pip
Using cached pip-9.0.1-py2.py3-none-any.whl
Installing collected packages: pip
Found existing installation: pip 8.1.1
Not uninstalling pip at /usr/lib/python3/dist-packages, outside environment /usr
Successfully installed pip-9.0.1
root@xxx:/home/czz#
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