一、准备工作
1.1 安装centos7.2.1511
1.2 下载python3.6.3 安装包（下载地址：https://www.python.org/downloads/）
1.3 安装依赖包：
yum -y install xz tar gcc make tk-devel wget sqlite-devel zlib-devel readline-devel openssl-devel curl-devel tk-devel gdbm-devel xz-devel bzip2-devel
1.4 创建安装目录：
mkdir -p /usr/local/python3
二、安装
2.1 解压python3.6.3安装包：
tar -zxvf Python-3.6.3.tgz
2.2 进入解压后的目录，编译安装：
# cd Python-3.6.3
# ./configure --prefix=/usr/local/python3
# make && make install
2.3 建立python3软连接
ln -s /usr/local/python3/bin/python3 /usr/bin/python3
2.4 修改环境变量
# echo 'export PATH=/usr/local/python3/bin:$PATH' >> /etc/profile
# source /etc/profile
2.5 安装完成后检查Python3及pip3是否正常可用
# python3 -V
# pip3 -V
2.6 说明：CentOS系统原有python2.7.5没有改变，仍然用python调用即可
安装3.7.3报错问题汇总：
# ./configure --prefix=/usr/local/python3 输入报错
解决：yum -y install gcc、yum -y install gcc-c++
安装好python3.7.3后无pip模块原因
解决：yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel libffi-devel