Centos7安装python3

1.安装依赖包

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

2.下载本身须要的python版本，例如python3.6.2,下载要花费一段时间，要耐心等待

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz

3.新建一个文件夹存放python3

mkdir /usr/local/python3

4.把安装包移动到该新建文件夹下，解压安装包，安装python3,依次执行如下命令，花费时间较长，耐心等待

mv Python-3.6.2.tar.xz /usr/local/python3

tar -xvJf Python-3.6.2.tar.xz

cd Python-3.6.2

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

make

make install

5.建立软链接

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

6.此时python3已经装好，在命令行中输入python3测试

 

7.修改yum配置文件，python2与python3共存
vi /usr/bin/yum
把#! /usr/bin/python修改成#! /usr/bin/python2（配置文件第一行）
同理
vi /usr/libexec/urlgrabber-ext-down
把文件里面的#! /usr/bin/python 也修改成#! /usr/bin/python2

此时完成python3安装，且实现与python2共存,保持yum命令可用