centos7安装使用pip3，报错pip3 command not found

1、先安装EPEL

yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm

2、将原有的备份epel.repo和epel-testing.repo

mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.back
 
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.back

3、重新安装epel.repo

sudo wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

4、再运行如下命令，安装pip3

sudo yum install python3-pip