运维笔记--linux环境提示python: command not found

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/