centos7 install python3.7.4
编译python3所用到的相关依赖
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel
可选gcc make
yum install libffi-devel
下载python3.7.4源码：
wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz
tar -zxvf Python-3.7.4.tgz
cd Python-3.7.4
./configure prefix=/usr/local/python3
make && make install
编译安装Python3.7的时候报错
ModuleNotFoundError: No module named ‘_ctypes’
主要是少安装了包：
yum install libffi-devel
重新make install即可
编译安装成功
Looking in links: /tmp/tmp7f4dx6bs
Collecting setuptools
Collecting pip
Installing collected packages: setuptools, pip
Successfully installed pip-19.0.3 setuptools-40.8.0
创建python3/pip3 软链接
ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3
注意:如果 python对应python3的话， 更改yum配置，否在无法使用
vi /usr/bin/yum
把#!/usr/bin/python修改为#! /usr/bin/python2
vi /usr/libexec/urlgrabber-ext-down