linux系统安装python3.6

如果本机安装了python2，尽量不要管他，使用python3运行python脚本就好，因为可能有程序依赖目前的python2环境

比如yum！！！！！

不要动现有的python2环境！

1）安装依赖环境

# 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

如果安装依赖不成功，则按如下方式安装依赖

sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev

2)  下载Python3

　https://www.python.org/downloads/

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

3）安装python3

　   本文安装在如下目录 /usr/local/python3（具体安装位置看个人喜好）　

创建目录：

# mkdir -p /usr/local/python3

解压下载好的Python-3.6.1.tgz

# tar -zxvf Python-3.6.1.tgz

4）进入解压后的目录，编译安装。

# cd Python-3.6.1

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

# make

# make install

 

5）建立python3的软链

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

此步骤如有以下错误提示：

ln: creating symbolic link `/usr/bin/python3': File exists

解决办法：

把原来的/usr/bin/python3 通过以下命令备份一下

$ mv /usr/bin/python3 /usr/bin/python3_old

6）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。

修改完后执行下面的命令，让上一步的修改生效：

# source ~/.bash_profile

7）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)

8）如若不可用，创建下pip3的软链接

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