Created and installed deb package but when i run it it says 'command not found'

Question

I'm trying to turn a simple python program into a debian package for Linux.

I created a folder /testhello , and created testhello/DEBIAN and testhello/usr . Inside testhello/DEBIAN i have a control file that contains:

Package: testhello
Version: 0.01
Architecture: all
Maintainer: Me,me@gmail.com
Installed-Size: 2
Depends: python3
Section: extras
Priority: optional
Homepage: your homepage
Description: describe

Inside testhello/usr there's a bin folder, that contains testhello.py , a file that contains a single line, print("hello world")

I then successfully ran dpkg -b testhello and then sudo dpkg -i testhello .

But when i run the command testhello in bash i am greeted with testhello: command not found

What can I do?

Edit 1: When i go to /bin i can see testhello.py there.

Answer 1

Check the shebang (first line):

#! /usr/bin/env python
print("hello world")

give execute permission and should work.