centos7 自带的python版本是2.7，但是现在很多python项目需要python3.9以上的版本，所以需要自己手动部署python3.9。这里记录一下部署python3.9的过程。
安装依赖
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yum install openssl-devel bzip2-devel expat-devel gdbm-devel readline-devel sqlite-devel
yum install zlib-devel bzip2-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make libffi-devel
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下载安装包
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wget https://www.python.org/ftp/python/3.9.0/Python-3.9.0.tgz
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解压安装包
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# 解压压缩包
tar -zxvf Python-3.9.0.tgz
# 进入文件夹
cd Python-3.9.0
# 配置安装位置
./configure prefix=/usr/local/python3
# 安装
make && make install
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添加软连接
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[root@centos-moxc bin]# ln -s /usr/local/python3/bin/python3.9 /usr/bin/python3
[root@centos-moxc bin]# ln -s /usr/local/python3/bin/pip3.9 /usr/bin/pip3
[root@centos-moxc bin]# python3 -V
Python 3.9.0
[root@centos-moxc bin]# pip3 -V
pip 20.2.3 from /usr/local/python3/lib/python3.9/site-packages/pip (python 3.9)
# 查看软连接指向
[root@centos-moxc bin]# ll /usr/bin/ |grep python
-rwxr-xr-x 1 root root 11240 Apr 2 2020 abrt-action-analyze-python
lrwxrwxrwx 1 root root 29 Nov 14 01:04 pip3 -> /usr/local/python3/bin/pip3.9
lrwxrwxrwx 1 root root 7 Sep 3 11:48 python -> python2
lrwxrwxrwx 1 root root 9 Sep 3 11:48 python2 -> python2.7
-rwxr-xr-x 1 root root 7144 Apr 2 2020 python2.7
lrwxrwxrwx 1 root root 32 Nov 14 01:04 python3 -> /usr/local/python3/bin/python3.9
[root@centos-moxc bin]# ll /usr/bin/ |grep pip
-rwxr-xr-x. 1 root root 2291 Jul 31 2015 lesspipe.sh
lrwxrwxrwx 1 root root 29 Nov 14 01:04 pip3 -> /usr/local/python3/bin/pip3.9
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