安装python3.x

1.安装依赖环境

1 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python3.x

1 https://www.python.org/downloads/
2 wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

3.安装python

1 创建目录
2 mkdir -p /usr/local/python3
3 解压缩
4 tar -zxvf Python-3.6.1.tgz
5 进入解压缩目录，编译安装
6 cd Python-3.6.1
7 ./configure --prefix=/usr/local/python3
8 make && make install

1 创建软连接
2 ln -s /usr/local/python3/bin/python3 /usr/bin/python3

4.将python加入环境变量

1 # vim ~/.bash_profile
2 # .bash_profile
3 # Get the aliases and functions
4 if [ -f ~/.bashrc ]; then
5 . ~/.bashrc
6 fi
7 # User specific environment and startup programs
8 PATH=$PATH:$HOME/bin:/usr/local/python3/bin
9 export PATH

执行命令生效
source ~/.bash_profile

5.查看python和pip版本

# python3 -V
Python 3.6.1
# pip3 -V
pip 9.0.1 from /usr/local/python3/lib/python3.6/site-packages (python 3.6)