Centos7安装Pyhton3

安装编译工具

yum -y groupinstall "Development tools"

yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gdbm-devel db4-devel libpcap-devel xz-devel

yum install libffi-devel -y

下载python源码，并解压

wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tar.xz

tar -xvJf  Python-3.7.0.tar.xz

编译

mkdir /usr/local/python3

cd Python-3.7.0

./configure --prefix=/usr/local/python3

make && make install

创建软连接

ln -s /usr/local/python3/bin/python3 /usr/local/bin/python3

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

验证是否成功

python3 -V

pip3 -V

Python2和Python3共存

1.查看当前python版本

python -V

Python 2.6.6

2.备份当前python版本

mv /usr/bin/python /usr/bin/python2.6.6

3.简历python软连接

which python3

/usr/local/bin/python3

ln -s /usr/local/bin/python3 /usr/bin/python

4.校验版本

python -V

Python 3.7.0

5.修改yum
vi /usr/bin/yum #将文件头部的#!/usr/bin/python 改成#!/usr/bin/python2.6.6