Passing Python Variables to Powershell Script

Question

I'm looking to pass variables from a Python script into variables of a Powershell script without using arguments.

var_pass_test.py

import subprocess, sys

setup_script = 'C:\\Users\\user\\Desktop\\Code\\Creation\\var_pass_test.ps1'

test1 = "Hello"

p = subprocess.run(["powershell.exe", 
          setup_script], test1,
          stdout=sys.stdout)

var_pass_test.ps1

Write-Host $test1

How would one go about doing this such that the Powershell script receives the value of test1 from the Python script? Is this doable with the subprocess library?

Possible duplicate of [this](https://stackoverflow.com/q/4795190/11659881) but I'm unsure what you mean by "without using arguments". How would you pass the argument to Powershell if you were running this in Powershell instead of python? — Kraigolas, May 25 '21 at 21:53
I agree with @Kraigolas, you are trying to shoot without using bullets. That being said, putting the test1 into a temp file and reading that from Powershell *would* work, but it's fugly and just passing parameters to Powershell directly is the way to do it. — Edo Akse, May 25 '21 at 22:06

score 4 · Answer 1 · answered May 25 '21 at 23:56

To pass arguments verbatim to the PowerShell CLI, use the -File option: pass the script-file path first, followed by the arguments to pass to the script.
In Python, pass all arguments that make up the PowerShell command line as part of the first, array-valued argument:

import subprocess, sys

setup_script = 'C:\\Users\\user\\Desktop\\Code\\Creation\\var_pass_test.ps1'

test1 = "Hello"

p = subprocess.run([
            "powershell.exe", 
            "-File", 
            setup_script,
            test1
          ],
          stdout=sys.stdout)

score 0 · Answer 2 · answered Aug 29 '23 at 05:23

You can also send variables to instances of PowerShell using f string formatted variables.

import subprocess
from time import sleep

var1 = 'Var1'
var2 = 'var2'

# List of values 
list_tab = ['389', '394', '399', '404', '409', '415', '444', '449', '495']

# Open PS instance for each value
for times in list_tab:
    # Use f string to send variables to PS
    subprocess.call(f'start C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe -noexit -File path_to_file.ps1 {var1} {var2}', shell=True)

Passing Python Variables to Powershell Script

2 Answers2