The digraph written as #! is used to:

The digraph written as #! is used to:
A . tell a Unix or Unix-like OS how to execute the contents of a Python file.
B. create a docstring.
C. make a particular module entity a private one.
D. tell an MS Windows OS how to execute the contents of a Python file.

Answer: A

Explanation:

Topics: #! shebang

This is a general UNIX topic.

Best read about it here:

https://en.wikipedia.org/wiki/Shebang_(Unix)