I made a portable python script on Windows, by putting the whole python folder into the root directory:

ProjectFolder
|- run.bat
|- main.py
|- python <--- Python 3.10.1, downloaded from https://www.python.org/downloads/release/python-3101/
 |- ...
 |- python.exe
 |- ...

run.bat

@setlocal enableextensions
@cd /d "%~dp0"
start "