:start

echo ================================================

echo    1. Python 3.8.x.x

echo    2. Python 3.9.x.x

echo    3. Exit

echo ================================================

echo.

set /p x=python 실행 :

if %x%==1 goto python38

if %x%==2 goto python39

if %x%==3 goto exit

:python38

set pythondir=C:\Python38100\

path = %path%;%pythondir%

python.exe

goto start

:python39

set pythondir=C:\Python3940s\

path = %path%;%pythondir%

python.exe

goto start

:exit

Exit