Powershell sending JSON variable to Python

Question

I'm having a problem with sending a JSON variable from PowerShell to python.

That's the code I have for python:

import subprocess
import os 
import json

firstname = 'FirstName'
lastname = 'LastName'

args2 = '-FIRSTNAME %s -LASTNAME %s' % (firstname, lastname)

test = subprocess.run([
    'powershell.exe',
    'Path\\Test2.ps1',
    args2,
])

jsonvalue = json.loads(test)

print(jsonvalue)

And here's for PowerShell:

Param(
    [Parameter(Mandatory)][string]$FIRSTNAME,
    [Parameter(Mandatory)][string]$LASTNAME
)

$result = [PSCustomObject]@{
    FirstName = $FIRSTNAME
    LastName = $LASTNAME
    FullName = $FIRSTNAME + " " + $LASTNAME
}

return $result | ConvertTo-Json

JSON output:

{
    "FirstName":  "FirstName",
    "LastName":  "LastName",
    "FullName":  "FirstName LastName"
}

The error message I'm getting is:

TypeError: the JSON object must be str, bytes or bytearray, not CompletedProcess

From what I've read it looks like subprocess.run is returning CompletedProcess variable type. Unfortunately, although I tried to bypass it wouldn't work.

I think it might be pretty simple, but I cannot find an answer on my own. I'm pretty new to Python and connecting those two languages might be a bit of overkill for a beginner but isn't that the best way to learn? :D

Shouldn't -FIRSTNAME, firstname, etc all be separate elements of run's list argument, rather than combined in a single string value? — chepner
– chepner, Commented Jul 20, 2021 at 13:39
arg2 = ['-FIRSTNAME', firstname, '-LASTNAME', lastname]; run(['powershell.exe', 'PATH...', *args2])? — chepner
– chepner, Commented Jul 20, 2021 at 13:40
I tried to do it that way at the beginning, but it wouldn't work. EDIT: Oh, I see, there's an asterisk before "args", now it works. — Patryk Gołębiowski
– Patryk Gołębiowski, Commented Jul 20, 2021 at 14:17

chepner · Accepted Answer · 2021-07-20 13:42:21Z

2

run doesn't return a string containing the output; you want the stdout attribute of the return value.

test = subprocess.run(...)
jsonvalue = json.loads(test.stdout)

Or, use the check_output function instead.

test = subprocess.check_output(...)
jsonvalue = json.loads(test)

answered Jul 20, 2021 at 13:42

chepner

538k77 gold badges594 silver badges746 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Powershell sending JSON variable to Python

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related