Tiny and feature-rich calculator application created by Python powered by Tkinter. (GUI Calculator)
$ python app.py
The Tkinter library is built-in with every Python installation.
Read more: https://tkdocs.com/tutorial/install.html
At first you need to install the pyinstaller: $ pip install pyinstaller
Next:
$ pyinstaller --onefile -w app.py
Note: this is python. so everyone can emit and reverse(like decompile) your program.
I get the idea from a video.