CODE EXAMPLE FOR PYTHON

py3-env.bat

@ECHO OFF 

set "OSGEO4W_ROOT=%~1"
echo %OSGEO4W_ROOT%

set PATH=%OSGEO4W_ROOT%in;%PATH%
set PATH=%PATH%;%OSGEO4W_ROOT%appsqgisin

@echo off
call "%OSGEO4W_ROOT%ino4w_env.bat"
call "%OSGEO4W_ROOT%inqt5_env.bat"
call "%OSGEO4W_ROOT%inpy3_env.bat"
@echo off
path %OSGEO4W_ROOT%appsqgisin;%PATH%

cd /d %~dp0

::start cmd