Executing a PowerShell script OUTSIDE of Python

Question

I am trying to run a sort of application that utilises both Python and powershell scripts. I already wrote the Python script and powershell script, which are meant to work simultaneously but separate from each other. What I want to do is create a Python program that launches them both, is there a way? Thanks! What I have right now, as part of a larger script, is:

import subprocess
autom = r"C:\Users\mrmostacho\Desktop\Robot\Autom.ps1","-ExecutionPolicy","Unrestricted"
powershell = r"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"
subprocess.Popen("%s %s" % (powershell, autom,))

What have you tried so far? Hint: docs.python.org/3/library/subprocess.html — cdarke
– cdarke, Commented May 28, 2017 at 15:49
I've tried using a subprocess.Popen that runs the file and PoweSshell.exe, however, what that does is rename the Python window into PowerShell, but the written PowerShell program does not launch — Esteb37
– Esteb37, Commented May 28, 2017 at 15:52
If that is your problem then show your code and someone might be able to help you with it. — cdarke
– cdarke, Commented May 28, 2017 at 15:54
Try passing Popen just the path to PowerShell script by itself. — martineau
– martineau, Commented May 28, 2017 at 16:08
Try using the start shell command (possibly you'll need shell=True in the Popen constructor as well). That should detach the launched process from the Python proces. — kindall
– kindall, Commented May 28, 2017 at 16:09

T S · Accepted Answer · 2018-07-17 20:41:07Z

I think you don't want "-ExecutionPolicy","Unrestricted" as script arguments but instead want to set powershells execution policy to allow the execution of your script. Therefore you should pass those parameters before the actual Script.

Second: It's not enough, to pass the script as argument to powershell.exe (this way the script name is interpreted as Powershell command and one has to escape the name according to powershells quoting rules). Instead the Script name should be given after the -File parameter. From online documentation:

-File []

Runs the specified script in the local scope ("dot-sourced"), so that the functions and variables that the script creates are available in the current session. Enter the script file path and any parameters. File must be the last parameter in the command, because all characters typed after the File parameter name are interpreted as the script file path followed by the script parameters.

You can include the parameters of a script, and parameter values, in the value of the File parameter. For example: -File .\Get-Script.ps1 -Domain Central

Typically, the switch parameters of a script are either included or omitted. For example, the following command uses the All parameter of the Get-Script.ps1 script file: -File .\Get-Script.ps1 -All

In rare cases, you might need to provide a Boolean value for a switch parameter. To provide a Boolean value for a switch parameter in the value of the File parameter, enclose the parameter name and value in curly braces, such as the following: -File .\Get-Script.ps1 {-All:$False}.

Third: As cdarke already commented, it's better to use a list instead of a string as argument to Popen. This way one doesn't need to worry about the CommandLine parsing on Windows.

Altogether, this should be the way to go. (Tested with small test script.)

import subprocess
autom = r"C:\Users\mrmostacho\Desktop\Robot\Autom.ps1"
powershell = r"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"
subprocess.Popen([powershell,"-ExecutionPolicy","Unrestricted","-File", autom])

If you need to pass arguments to the script, do it like this:

subprocess.Popen([powershell,"-ExecutionPolicy","Unrestricted","-File", autom, 'arg 1', 'arg 2'])

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