问题：
(base) zhiwen.wang@server-007:~$ sudo iotop
No module named 'iotop'
To run an uninstalled copy of iotop,
launch iotop.py in the top directory

解决办法：
https://blog.csdn.net/YoFog/article/details/105975712
sudo vim /usr/sbin/iotop

开头改成

!/usr/bin/python2