liunx下安装python

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1.下载python3

# wget https://www.python.org/ftp/python/3.6.1/Python-3.6.1.tgz

2.安装python 

安装路径（看个人喜好，路径随意）：

mkdir -p /usr/local/python3

解压下载好的压缩包，我这里是3.6的包，按个人下载的解压：

# tar -zxvf Python-3.6.1.tgz

3.进入解压的目录，进行编译安装

# cd Python-3.6.1
# ./configure --prefix=/usr/local/python3

make

make install

4.建立python3的软链

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

5.并将/usr/local/python3/bin加入PATH

# vim ~/.bash_profile
# .bash_profile
# Get the aliases and functions
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
# User specific environment and startup programs
PATH=$PATH:$HOME/bin:/usr/local/python3/bin
export PATH

按ESC，输入：wq回车退出。

修改完记得执行下面的命令，让上一步的修改生效

# source ~/.bash_profile

检查python3及pip3是否正常可用：

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