CentOS7 安装Python3.6.8

1. 安装依赖环境

   yum -y groupinstall "Development tools"

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Python3.6.8

新建个/usr/local/python3文件夹

mkdir /usr/local/python3

　 
在python3文件夹下下载安装包

（/usr/local/python3 )

wget https://www.python.org/ftp/python/3.6.8/Python-3.6.8.tar.xz

解压文件

tar -xvf Python-3.6.8.tar.xz

3、安装Python3

创建安装文件的路径

mkdir /usr/local/python3

4、编译（在解压的文件夹下 /usr/local/python3/python3.6.8)

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

5、安装（在解压的文件夹下 /usr/local/python3/python3.6.8)

make
make install  # 先make再make install

6、创建新版本的软链接

修改旧版本

mv /usr/bin/python /usr/bin/python_bak
mv /usr/bin/pip /usr/bin/pip_bak

创建新的软连接　　

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

检查python的版本

python -V

7、配置成功后，pip3用不了，需要进一步配置

将/usr/local/python3/bin加入PATH

vim ~/.bash_profile

修改后如下： 
.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

复制代码 
保存退出后，执行以下命令，让上一步修改成功

source ~/.bash_profile 
完成！

不过，由于yum是py2写的，所以更换完python路径后，yum可能会出现错误 
所以要修改配置文件

vim /usr/bin/yum
vim /usr/libexec/urlgrabber-ext-down

把第一行python改为python2