centos7 安装python 3

• 下载

wget -c https://www.python.org/ftp/python/3.9.6/Python-3.9.6.tgz  

• 解压到/usr/local/
• 依赖包安装

yum install libffi-devel
yum install openssl-devel

// 可能还有一些依赖的，我的环境之前已经安装过
// yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel

• 编译

cd Python-3.9.6/
mkdir /usr/local/python3
./configure -prefix=/usr/local/python3
make
make install

• 链接python3. pip3

  ln -s /usr/local/python3/bin/python3.9 /usr/bin/python3
  ln -s /usr/local/python3/bin/pip3.9 /usr/bin/pip3

• 测试

  $ python3 --version
  Python 3.9.6
  $ pip3 --version
  pip 21.1.3 from /usr/local/python3/lib/python3.9/site-packages/pip (python 3.9)