查看系统版本

[root@owl local]# cat /etc/centos-release
CentOS Linux release 7.9.2009 (Core)
查看版本信息
[root@owl local]# uname -a
Linux owl.com 3.10.0-1160.el7.x86_64 #1 SMP Mon Oct 19 16:18:59 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

查看Python版本

[root@owl local]# python -V
Python 2.7.5
[root@owl local]# python3 -V
Python 3.6.8
查看Python路径
[root@owl local]# python -V
Python 2.7.5
[root@owl local]# whereis python
python: /usr/bin/python /usr/bin/python2.7 /usr/bin/python3.6 /usr/bin/python3.6m /usr/lib/python2.7 /usr/lib/python3.6 /usr/lib64/python2.7 /usr/lib64/python3.6 /etc/python /usr/include/python2.7 /usr/include/python3.6m /usr/share/man/man1/python.1.gz
查看Python指向
[root@owl local]# python3 -V
Python 3.6.8
[root@owl local]# cd /usr/bin/
[root@owl bin]# ll python*
lrwxrwxrwx. 1 root root     7 11月 12 20:52 python -> python2
lrwxrwxrwx. 1 root root     9 11月 12 20:52 python2 -> python2.7
-rwxr-xr-x. 1 root root  7144 6月  28 23:30 python2.7
lrwxrwxrwx. 1 root root     9 11月 12 20:52 python3 -> python3.6
-rwxr-xr-x. 2 root root 11328 11月 17 2020 python3.6
-rwxr-xr-x. 2 root root 11328 11月 17 2020 python3.6m
-rwxr-xr-x. 1 root root   404 12月  6 2020 python3-html2text
lrwxrwxrwx. 1 root root    17 11月 12 20:52 python-html2text -> python3-html2text

由此可以系统默认安装了Python2.7和Python3.6

安装依赖$$下载Python

yum -y groupinstall "Development tools"
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
yum install libffi-devel -y

wget https://www.python.org/ftp/python/3.8.3/Python-3.8.3.tgz
tar -zxvf  Python-3.8.3.tgz

编译Python && 创建软连接

  • 编译Python

mkdir /usr/local/python3 #创建编译安装目录
cd Python-3.8.3
./configure --prefix=/usr/local/python3
make && make install

创建软连接
# 查看当前python软连接
ll /usr/bin/ |grep python

-rwxr-xr-x.   1 root root      11232 10月  2 2020 abrt-action-analyze-python
lrwxrwxrwx.   1 root root         17 11月 12 20:52 html2text -> python3-html2text
lrwxrwxrwx.   1 root root         27 11月 14 00:11 pip -> /usr/local/python3/bin/pip3
lrwxrwxrwx.   1 root root         30 11月 14 00:10 python -> /usr/local/python3/bin/python3
lrwxrwxrwx.   1 root root          9 11月 12 20:52 python2 -> python2.7
-rwxr-xr-x.   1 root root       7144 6月  28 23:30 python2.7
lrwxrwxrwx.   1 root root          9 11月 12 20:52 python3 -> python3.6
-rwxr-xr-x.   2 root root      11328 11月 17 2020 python3.6
-rwxr-xr-x.   2 root root      11328 11月 17 2020 python3.6m
-rwxr-xr-x.   1 root root        404 12月  6 2020 python3-html2text
lrwxrwxrwx.   1 root root         17 11月 12 20:52 python-html2text -> python3-html2text

系统模式为Python2.7

删除软连接&& 添加新链接

rm -rf /usr/bin/python
#添加python3的软链接 
ln -s /usr/local/python3/bin/python3 /usr/bin/python
python -V
pip指向
rm -rf /usr/bin/pip
#添加 pip3 的软链接 
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip