本文基于Ubuntu20.04操作系统，相关命令是该系统特有，请注意甄别。
今天要给Python安装一个外部的模块，于是按照老师的方法，使用pip命令进行安装，结果一运行安装命令就出现了如下报错：
Command 'pip' not found, but there are 18 similar ones.
在网上找到的答案：
The different versions of Python are not surprising. WSL is, effectively, an ultra-lightweight virtual machine. Your Windows python installation is entirely independent of the WSL python installation.
Python has two widely used major versions, Python 2 and Python 3. The command python runs some minor version of Python 2, while the command python3 runs some minor version of Python 3. Below is my console output.
lawruble@Balrog:~/scratch$ python --version
Python 2.7.18
lawruble@Balrog:~/scratch$ python3 --version
Python 3.8.5
Pip is the python installation manager, and has the same major versions as Python. The command pip runs the Python 2 version of pip, while pip3 runs the Python 3 version of pip.
It's better practice to use python3 -m pip over pip3, it helps ensure that you're using the version of pip associated with the version of python you expect to run.
他的意思大概就是说要看一下自己使用的是什么版本的Python,如果用的是Python2的话，就可以使用pip命令。但是如果你安装的是Python3的话，就要使用pip3这个命令来安装。
看来我的情况跟他描述是一样的，我的确是系统默认安装的python3.8。然后我就试一试pip3，结果还是报错：
Command 'pip3' not found, but can be installed with:
sudo apt install python3-pip
原来我报错的原因是我根本就还没有安装pip3呢，不过好在它提示我可以安装，于是我就使用下面的命令安装了：
sudo apt install python3-pip
再次运行pip3安装模块，一切正常了。
Python小白之路，幼稚的问题可真多！
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