CentOS 7 中默认安装了 Python，版本比较低（2.7.5）

1、查看python版本

[root@localhost bin]# python --version

2、首先安装依赖包

[root@localhost bin]# 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

3 、下载python3安装包

[root@localhost bin]# cd /usr/local/src
[root@localhost bin]# wget https://www.python.org/ftp/python/3.7.4/Python-3.7.4.tgz

4、解压

[root@localhost src]# tar xvzf Python-3.7.4.tgz

5、创建文件夹把python3安装在里面

[root@localhost src]# mkdir -p /usr/local/python3

6、编译安装

[root@localhost src]# cd Python-3.7.4
[root@localhost src]#./configure --prefix=/usr/local/python3/
[root@localhost src]# make && make install

7、建立软连接

[root@localhost src]# ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3
[root@localhost src]# ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3

8、验证和测试

 [root@localhost bin]#python3