Linux Centos7安装python3.6，实现python2与python3共存

#!/bin/bash

#########Centos7安装python3

yum install wget zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make -y

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

tar -xvJf Python-3.6.2.tar.xz

cd Python-3.6.2

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

make && make install

cp /etc/profile /etc/profile.back

# vi /etc/profile 

#添加   export PATH="$PATH:/usr/local/python3/bin"

# source /etc/profile

cd /usr/bin/ && cp python python.bak

ln -s /usr/local/python3/bin/python3.6 /usr/bin/python3

#vi /usr/bin/yum

#把  #! /usr/bin/python 修改为#! /usr/bin/python2

# vi /usr/libexec/urlgrabber-ext-down

# 把 #! /usr/bin/python 修改为 #! /usr/bin/python2

python -V 

python3 -V