@IF NOT DEFINED DEBUG_HELPER @ECHO OFF

echo Looking for Python

setlocal enabledelayedexpansion

:: Use python.exe if in %PATH%

set need_path=0

for /f "delims=" %%a in ('where python.exe 2^> nul') do (

set p=%%~dpa

goto :found-python

)

:: Query the 3 locations mentioned in PEP 514 for a Python InstallPath

set need_path=1

for %%k in ( "HKCU\Software", "HKLM\SOFTWARE", "HKLM\Software\Wow6432Node") do (

call :find-versions %%k

if not errorlevel 1 goto :found-python

)

:: Check for pyenv-win installation using pyenv which python

for /f "tokens=*" %%i in ('pyenv which python 2^>nul') do set p=%%i

if defined p (

for /f "tokens=*" %%j in ('"%p%" --version') do set python_version=%%j

goto :found-python

)

goto :no-python

:: Find Python installations in a registry location

:find-versions

for /f "delims=" %%a in ('reg query "%~1\Python\PythonCore" /f * /k 2^> nul ^| findstr /r ^^HK') do (

call :read-installpath %%a

if not errorlevel 1 exit /b 0

)

exit /b 1

:: Read the InstallPath of a given Environment Key to %p%

:: https://www.python.org/dev/peps/pep-0514/#installpath

:read-installpath

:: %%a will receive everything before ), might have spaces depending on language

:: %%b will receive *, corresponding to everything after )

:: %%c will receive REG_SZ

:: %%d will receive the path, including spaces

for /f "skip=2 tokens=1* delims=)" %%a in ('reg query "%1\InstallPath" /ve /t REG_SZ 2^> nul') do (

for /f "tokens=1*" %%c in ("%%b") do (

if not "%%c"=="REG_SZ" exit /b 1

set "p=%%d"

exit /b 0

)

)

exit /b 1

:found-python

echo Python found in %p%\python.exe

call :check-python "%p%\python.exe"

if errorlevel 1 goto :no-python

endlocal ^

& set "pt=%p%" ^

& set "need_path_ext=%need_path%"

if %need_path_ext%==1 set "PATH=%pt%;%PATH%"

set "pt="

set "need_path_ext="

exit /b 0

:check-python

%1 -V

:: 9009 means error file not found

if %errorlevel% equ 9009 (

echo Not an executable Python program

exit /b 1

)

exit /b 0

:no-python

echo Could not find Python.

exit /b 1