解决：psutil/_psutil_common.c:9:20: fatal error: Python.h: No such file or directory 解决

 参考:https://blog.csdn.net/Linjingke32/article/details/79009427

 yum install python3-devel.x86_64

[popexizhi:自己安装的是 pip3.6 install Locust ，所以改成python3的安装]