1：yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make

2：yum -y install libffi-devel

3：mkdir -p /opt/software

4：cd /opt/software

5：wget https://www.python.org/ftp/python/3.7.2/python-3.7.2.tgz

6：tar -xvf Python-3.7.2.tgz

7：mkdir -p /usr/local/python3

8：cd Python-3.7.2/

9：./configure prefix=/usr/local/python3

10：make

11：make install

1：mv /usr/bin/python /usr/bin/python.bak
2：ln -s /usr/local/python3/bin/python3.7 /usr/bin/python
3：ln -s /usr/local/python3/bin/pip3 /usr/bin/pip

1：修改配置后yum源不能用的问题

vim /usr/bin/yum
将 #! /usr/bin/python 修改成 #! /usr/bin/python2

vim /usr/libexec/urlgrabber-ext-down
将 #! /usr/bin/python 修改成 #! /usr/bin/python2

2：如果make和make install过程报错，都是因为依赖不全，去第一部分下载依赖，就好了