[Python] Returning errors from Python to PowerShell?

I'm running multiple Python scripts in PowerShell, and I want at specific condition in Python script to notify PowerShell main script. Like throwing an error from Python and catching it with PowerShell.

Python example:

import os
print "Running Python script ..."
raise Exception("This Error is coming from Python")


And PowerShell main script:

$ErrorActionPreference = 'Stop'
try {
python runThisScript.py -ErrorAction Stop
# Write-Error -Message 'Oh no! An error!'
Write-Host "What is that?"
} catch {
Write-Host $_.Exception.Message -ForegroundColor Green
throw [System.Exception] "Python scrip XXX failed"
} finally {
Write-Host "This is the final block ..."
}


But this does not work. It will show:

Running Python script ...
Traceback (most recent call last):
File "runThisScript.py", line 5, in <module>
raise Exception("This Error is coming from Python")
Exception: This Error is coming from Python
What is that?
This is the final block ...


If I un-comment the line Write-Error -Message 'Oh no! An error!' this is what I want to see (the error is catch and handle by PowerShell).

Oh no! An error!
This is the final block ...
Python scrip XXX failed
At C:\Automation\general_stuff\tc\mainTestRunner.ps1:12 char:5
+ throw [System.Exception] "Python scrip XXX failed"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OperationStopped: ) [], Exception
+ FullyQualifiedErrorId : Python scrip XXX failed


Thank you in advance for your comments.

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