centos7安装python3

首先安装依赖包，centos里面是-devel，如果在ubuntu下安装则要改成-dev，依赖包缺一不可

sudo yum -y groupinstall "Development tools"
sudo 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 libffi-devel

然后获取python3的安装包

wget https://www.python.org/ftp/python/3.6.4/Python-3.6.4.tgz

解压文件：

tar -xvf Python-3.6.4.tgz

包安装在/usr/local/Python3

mkdir -p /usr/local/Python3

进入到文件目录

cd Python-3.6.4

配置

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

编译安装

make

make install

做软链接

ln -s /usr/local/python3/bin/python3.6 /usr/bin/python3

设置pip软连接

ln -s /usr/local/python3/bin/pip3.6 /usr/bin/pip3

测试是安装成功

python3 -V

因为yum源使用的Python2，替换为Python3以后，会导致其无法正常工作。需要修改以下信息：

修改yum配置文件： 

vi /usr/bin/yum

测试yum能否正常使用

yum -y install vim

参考博客：https://www.cnblogs.com/shaosks/p/9172606.html