PIP is not installed by default on CentOS ，And where there is no default source，So we need to add the source epel：
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yum -y install epel-release |
Then install PIP：
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yum install python-pip |
Original article written by Gerber drop-off：R0uter's Blog » RHEL / CentOS installation PIP
Reproduced Please keep the source and description link：https://www.logcg.com/archives/1715.html
I basically use pyenv management Python version
Now after another useful method，Unfortunately, most Chinese people still use the traditional way ...... it may be what they think of his orders not worth mentioning on the blog。I was almost recompiling .................. Well。