场景描述：
新部署的容器环境，终端执行python命令，提示没有该命令。
从报错异常可以看出，可能是python环境未安装。
分析思路：
检查python路径：
方式一：type -a python
方式二：
ls -l /usr/bin/python
ls -l /usr/bin/python*
方式三：
which python
如果输出空或者no such file or directory, 则说明未安装。
处理过程：
不同Linux系统版本安装方式不同！
Ubuntu/Debian/Mint Linux install Python
安装python2
$ sudo apt-get install python
安装python3
$ sudo apt-get install python3
Oracle/RHEL (Red Hat)/CentOS Linux install Python
$ sudo yum install python
Fedora Linux install Python
python2: $ sudo dnf install python
python3: $ sudo dnf install python3
MacOS X Unix install Python3
Type the following command:$ brew install python3
Arch Linux install Python
python2: $ sudo pacman -S python2
python3：$ sudo pacman -S python3
FreeBSD Unix install Python
Type the following pkg command to add the Python v2.x:# pkg install python2
OR To install the Python v2.x port:# cd /usr/ports/lang/python2/ && make install clean
To add the Python v3.x package:# pkg install python3
OR To install the Python v3.x port:# cd /usr/ports/lang/python3/ && make install clean
OpenBSD Unix install Python
Type the following pkg_add command to add the Python v2.x or 3.x:# pkg_add python
OR$ doas pkg_add python
如果需要创建软链接：
A note about broken symlink
Sometimes a soft link to Pythons’s executables is broken for some reason. For example, /usr/bin/python3.4 is real executables. You can point /usr/bin/python to /usr/bin/python3.4 for Python version 3.4 using the ln command:$ sudo ln -s /usr/bin/python3.4 /usr/bin/python
Now you can run program:$ python mycode.py
参考：https://www.cyberciti.biz/faq/bash-python-command-not-found/