Read Shebang, just a little shell knowledge, never again do not have obsessive-compulsive disorder

Python2:

To open a terminal, enter the following command:

[Email protected]:~$ vim helloa.py

In the Vim editor, enter edit mode (press i), enter the following code, and then exit edit mode (press ESC), save the file (press shift+ semicolon, and then press WQ to save the exit)

1  # !/usr/bin/python 2   3   Print " Hello Python2 " 4   Print 5/2

Then change the file executable permissions

[Email protected]:~$ chmod +x helloa.py

Then you can safely execute the helloa.py, just as you do other commands.

Python3:

With similar steps, we can enter a similar code like the following

1 # !/usr/bin/python3 2  3 Print ("hello python3") 4 Print (5/2)

The results of the implementation are as follows:

Summary, the first line in the Python code to #! The beginning, called Shebang, points to a script parser, which is consistent with writing shell scripts, and with this line we can use the script as a command.

Read Shebang, just a little bit of shell knowledge, never again do not have obsessive-compulsive disorder