CentOS默认安装Python2
一、首先安装依赖包
1）首先安装gcc编译器，gcc有些系统版本已经默认安装，通过 gcc --version 查看。
2）安装其它依赖包
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
wget https://www.python.org/ftp/python/3.7.0/Python-3.7.0.tgz
4）解压
tar -xvf Python-3.7.0.tgz
5）创建文件夹吧Python安装在里面
mkdir /usr/local/python3
cd Python3
./configure --prefix=/usr/local/python3/
make && make install
6) 建立软连接
ln -s /usr/local/python3/bin/python3.7 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3.7 /usr/bin/pip3
7）测试是否可以使用
python3 Python 3.7.0 (default, Jan 14 2019, 01:20:02) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)] on linux Type "help", "copyright", "credits" or "license" for more information. >>>