Cannot Run Powershell Script with Python

I am trying to 'Run PowerShell Script and Get the Result as Text'  PYTHON code snippet that can be found here https://support.smartbear.com/viewarticle/72616/  but I am getting the error below

code snippet

def Test():
oShell = Sys.OleObject["WScript.Shell"]
oExec = oShell.Exec("powershell -command Get-Process")
oExec.StdIn.Close() # Close standard input before reading output
# Get PowerShell output
strOutput = oExec.StdOut.ReadAll();
# Trim leading and trailing empty lines
strOutput = aqString.Trim(strOutput, aqString.stAll);
# Post PowerShell output to the test log line by line
aqString.ListSeparator = "\r\n";
for i in range(0, aqString.GetListLength(strOutput)):
Log.Message(aqString.GetListItem(strOutput, i))

AttributeError
'IDispatchIndexedPropertyWrapper' object has no attribute 'Close'
Error location:

I tried to run the same code snippet using VBScript and it executed successfully.