setting batch variables using python

Question

Python seems to process my attempt :

subprocess.call(['set' , 'logfile=cat'], shell=True)

It returns no errors. However when I try using logfile as a variable or do %logfile%, it doesn't seem to have set logfile as anything. How does one make batch variables from within a python script?

What I am attempting to do with this is: I have a batch script that sequentially runs several python scripts. I wanted to set a variable from within one of my python scripts that would persist throughout my batch script.

3 revs · Accepted Answer · 2017-03-20 10:29:34Z

1

Your variable is set, but as soon as the call returns, that instance of the shell ends and the variable goes away.

What are you trying to accomplish exactly? This sounds like an XY problem.

edited Mar 20, 2017 at 10:29

community wiki

3 revs
Adam Smith

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6 Comments

user3447675 Over a year ago

Oh I see. I have a batch script that sequentially runs several python scripts. I wanted to set a variable from within one of my python scripts that would persist throughout my batch script.

Adam Smith Over a year ago

@user3447675 you might be able to do that using an environment variable but I'm far from sure.

Alp Over a year ago

Environment variables won't help here. Child processes inherit their parent's environment, but changes to the environment made in a child process aren't reflected in the parent's environment.

Adam Smith Over a year ago

@Alp I don't actually know a great way for a python script launched by a batch file to affect the rest of the batch file. I'm turning my answer to community wiki -- if you have a good solution, please edit and post it!

Alp Over a year ago

@adsmith It would be a security hole if a child process could unilaterally alter the execution of the parent. You have to do something like this cooperatively: The child can communicate the desired change back to the parent, and the parent can then make the change if it deems it appropriate to do so.

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