Linux上安装python3

1、python下载

mkdir /usr/local/python3
wget http://cdn.npm.taobao.org/dist/python/3.6.5/Python-3.6.5.tgz
tar -zxvf Python-3.6.5.tgz

2、安装编译Python3源文件所需的编译环境 

yum install -y gcc  
yum install -y zlib*
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  

3.进入Python3 源文件文件夹

cd Python-3.6.5/

4.指定安装目录

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

5.编译源文件

make

6.正式安装

make install

7.建立软连接

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

8.添加环境变量

vi ~/.bash_profile

直接在path后面添加/usr/local/python3/bin
然后source ~/.bash_profile使变量生效