Command ‘python‘ not found, did you mean: command ‘python3‘ from deb python3

如果在Ubuntu中已经安装python3，但是执行的时候，会出现如下错误：

yww@yww:~/test$ python test.py
Command 'python' not found, did you mean:
  command 'python3' from deb python3
  command 'python' from deb python-is-python3

如果不确定是否安装python，可以通过在终端中输入以下命令

python3 --version

查看是否安装，如果没有安装python，需要通过如下命令安装python

sudo apt install python3

如果确定已经安装python，有两种方法可以运行py文件

1. 通过python3运行

python3 test.py

2. 将python命令映射到python，需要安装软件包`python-is-python3`：

sudo apt install python-is-python3

安装过程如下：

yww@yww:~/test$ sudo apt install python-is-python3
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
  python-is-python3
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
Need to get 2,788 B of archives.
After this operation, 13.3 kB of additional disk space will be used.
Get:1 https://mirror.nju.edu.cn/ubuntu jammy/main amd64 python-is-python3 all 3.9.2-2 [2,788 B]
Fetched 2,788 B in 11s (264 B/s)              
Selecting previously unselected package python-is-python3.
(Reading database ... 220473 files and directories currently installed.)
Preparing to unpack .../python-is-python3_3.9.2-2_all.deb ...
Unpacking python-is-python3 (3.9.2-2) ...
Setting up python-is-python3 (3.9.2-2) ...
Processing triggers for man-db (2.10.2-1) ...
yww@yww:~/test$ python test.py
hello yww
hello world