Centos7安装python3

Centos自带python2，由于执行yum需要python2，所以即使安装了python3也不能删除python2
1.安装依赖包

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.下载自己需要的python版本，例如python3.6.2

wget https://www.python.org/ftp/python/3.6.2/Python-3.6.2.tar.xz

3.新建一个文件夹存放python3

mkdir /usr/local/python3 

4.把安装包移动到该新建文件夹下，解压安装包，安装python3,依次执行以下命令

mv Python-3.6.2.tar.xz /usr/local/python3
tar -xvJf  Python-3.6.2.tar.xz
cd Python-3.6.2
./configure --prefix=/usr/local/python3
make  && make install

5.创建软连接

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

6.输入python3测试