Centos7.5自帶為/usr/bin/python2.7，需升級到python3.6，安裝非常簡單，直接通過yum.

#centos7 python
yum install epel-release -y
yum install https://centos7.iuscommunity.org/ius-release.rpm -y

yum install python36u -y

yum install python36u-pip -y

#修改yum python引用為 /usr/bin/python2.7

#第一行/usr/bin/python改為/usr/bin/python2.7

vim /usr/bin/yum

vim /usr/libexec/urlgrabber-ext-down

到這邊全部結束...