I have seen this but my root's path has no access to pip
.
Here is my terminal output.
lxa@lxa-pc:~$ lxa@lxa-pc:~$ sudo -H pip -V [sudo] lxa 的密码: pip 8.1.1 from /usr/lib/python3/dist-packages (python 3.5) lxa@lxa-pc:~$ pip -V pip 9.0.1 from /home/lxa/.local/lib/python3.5/site-packages (python 3.5) root@lxa-pc:~$ echo $PATH /home/lxa/bin:/home/lxa/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin lxa@lxa-pc:~$ sudo su lxa@lxa-pc:/home/lxa# echo $PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games lxa@lxa-pc:/home/lxa#