linux系统下安装python3

python版本：Python-3.6.4.tar.xz

下载地址：https://www.python.org/downloads/release/python-364/ 选择XZ compressed source tarball进行下载

# yum install xz

1. 安装依赖环境---这个步骤很重要 

# 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.安装python

　　安装在/usr/local/python3（具体安装位置看个人喜好）
　　创建目录：

# mkdir /usr/local/python3

　　将Python-3.6.4.tar.xz放入在/tmp目录下

# tar xvf xxx.tar Python-3.6.4.tar.xz 解压文件

# cd /tmp/Python-3.6.4

# ./configure --prefix=/usr/local/python3 配置安装位置

# make

# make instanll

3.建立软连接

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

4.配置环境变量

# vi ~/.bash_profile

# PATH=$PATH:$HOME/bin:/usr/local/python3/bin

# export PATH

5.让path生效

# source ~/.bash_profile

6.创建pip3软连接

# ln -s /usr/lib/python3/Python-3.6.4/bin/pip3 /usr/bin/pip3

7.有些人提到的setuptools等我们在安装virtualenv时候就已经一键添加了并不需要了。

[root@promote Python-3.6.4]# pip3 install pymysql
Collecting pymysql
  Downloading PyMySQL-0.8.0-py2.py3-none-any.whl (83kB)
    100% |████████████████████████████████| 92kB 38kB/s
Installing collected packages: pymysql
Successfully installed pymysql-0.8.0
[root@promote Python-3.6.4]# ^C
[root@promote Python-3.6.4]#