automatically determine python exe path and set environment variable accordingly in batch file?

Question

I have Python installed in:

C:\Python27\python.exe

I need to run Python script from batch file by setting environment variable that points to Python exe. Update: based on response here, i found that install directory in registry has:

HKLM\SOFTWARE\Wow6432Node\Python\PythonCore\2.7\InstallPath

with Name:Default and data: C:\Python27\

Now, runing the batch command like this:

for /f "tokens=*" %%A in ('REG QUERY "HKLM\SOFTWARE\Wow6432Node\Python\PythonCore\2.7\InstallPath" /v Default') DO (
    set CHESSPYTHONPATHv1=%%B)

Gives error:

The System was unable to find specified registry key or value.

Q1) what am i doing wrong?
Q2) This still requires version number to be known by manually looking into registry . if batch file was to run on another PC, with different Python version, this would fail. How do i specify the registry search path which determines version installed too?
Thanks
sedy

Check out package "os"; the path attribute for packages is a huge help. — Prune
– Prune, Commented Oct 20, 2015 at 0:03

MervS · Accepted Answer · 2018-04-08 03:32:39Z

1

I'm assuming that you need to do everything in batch. You can try the following:

@echo off
for /f "delims=" %%a in ('REG QUERY "HKLM\SOFTWARE\Python\PythonCore" /s ^| findstr InstallPath') do  (
  set key=%%a
  goto :endfor
)
:endfor
for /f "tokens=2*" %%a in ('REG QUERY %key% /ve') do set "CHESSPYTHONPATHv1=%%~bpython.exe"
echo %CHESSPYTHONPATHv1%

The first result in the first registry query should contain the InstallPath. The second query retrieves the Python path.

edited Apr 8, 2018 at 3:32

answered Oct 20, 2015 at 1:45

MervS

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1 Comment

user915783 Over a year ago

Thanks ..works like a charm(just had to change little bit for 64 bit Win)

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