在CentOS 7上安装Python 3的步骤如下：
安装依赖包
```bash
yum -y groupinstall "Development tools"
yum -y install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make
下载Python 3源码包```bashwget https://www.python.org/ftp/python/3.11.0/Python-3.11.0.tgz
解压源码包
```bash
tar -xzf Python-3.11.0.tgz
进入解压后的目录```bashcd Python-3.11.0
配置编译选项
```bash
./configure --prefix=/usr/local/python3 --enable-optimizations
编译并安装```bashmake & make install
测试安装情况
```bash
/usr/local/python3/bin/python3 -V
配置环境变量（可选）如果你希望`python`命令指向Python 3，需要修改环境变量。编辑`~/.bashrc`或`~/.bash_profile`文件，添加以下行：```bashexport PATH=/usr/local/python3/bin:$PATH
然后运行`source ~/.bashrc`或`source ~/.bash_profile`使更改生效。
以上步骤应该可以帮助你在CentOS 7上成功安装Python 3。