@echo off
setlocal

cd /d "%~dp0"
set PORT=8000
set URL=http://localhost:%PORT%/index.html

where py >nul 2>&1
if %ERRORLEVEL%==0 (
  start "" "%URL%"
  py -3 -m http.server %PORT%
  goto :eof
)

where python >nul 2>&1
if %ERRORLEVEL%==0 (
  start "" "%URL%"
  python -m http.server %PORT%
  goto :eof
)

echo Python was not found.
echo Install Python 3 from https://www.python.org/downloads/ and try again.
pause