I am writing a python script which checks various conditions and runs a powershell script accordingly to help me automate migration from windows XP to windows 7. The powershell script gives its own output giving the user updates as to what is happening. I would like to take the output of the powershell script and print it as output of the python script. I have looked around at some questions which seem to want to do the same thing but they don't seem to be working for me. Initially I tried using
import subprocess subprocess.call(["C:\Users\gu2124\Desktop\helloworld.ps1"])
As was suggested here Run PowerShell function from Python script but I found out that this waits for the program to execute first and does not give output so I found out I need to use subprocess.Popen()
as was suggusted here Use Popen to execute a Powershell script in Python, how can I get the Powershell script's output and update it to web page? so I tried this
import subprocess subprocess.Popen(["C:\Users\gu2124\Desktop\helloworld.ps1"], stdout=sys.stdout)
and I get this error
Traceback (most recent call last): File "C:\Users\gu2124\Desktop\pstest.py", line 5, in <module> subprocess.Popen(["C:\Users\gu2124\Desktop\helloworld.py1"], stdout=sys.stdout) File "C:\Python27\lib\subprocess.py", line 701, in __init__ errread, errwrite), to_close = self._get_handles(stdin, stdout, stderr) File "C:\Python27\lib\subprocess.py", line 848, in _get_handles c2pwrite = msvcrt.get_osfhandle(stdout.fileno()) File "<string>", line 523, in __getattr__ File "C:\Program Files\PyScripter\Lib\rpyc.zip\rpyc\core\netref.py", line 150, in __getattr__ return syncreq(self, consts.HANDLE_GETATTR, name) File "C:\Program Files\PyScripter\Lib\rpyc.zip\rpyc\core\netref.py", line 71, in syncreq return conn.sync_request(handler, oid, *args) File "C:\Program Files\PyScripter\Lib\rpyc.zip\rpyc\core\protocol.py", line 434, in sync_request raise obj AttributeError: DebugOutput instance has no attribute 'fileno'
I'm not completely sure what this means but from what I think I understand after reading this AttributeError: StringIO instance has no attribute 'fileno' is that it is because I am messing with the stdout incorrectly. I looked a around more and I found this Why won't my python subprocess code work? where the answers said to use stdout=subprocess.PIPE
so I tried this
import subprocess subprocess.Popen(["C:\Users\gu2124\Desktop\helloworld.ps1"], stdout=subprocess.PIPE)
which also does not give me output Finally I saw this http://www.pythonforbeginners.com/os/subprocess-for-system-administrators and changed my code to this
import subprocess p = subprocess.Popen(["powershell","C:\Users\gu2124\Desktop\helloworld.ps1"], stdout=subprocess.PIPE) print p.communicate
I thought that it may because I am initially trying to run a powershell script from the command line so I have to open powershell first. When I type these commands directly into the command line it works the way it should but when I run it through the python script it gives this
<bound method Popen.communicate of <subprocess.Popen object at 0x00000000026E4A90>>
which is an improvement I guess but not the "Hello world" I was expecting. I have no idea what I should try to do next to get this to work. Any help would be greatly appreciated
Also if the powershell script I am using is needed here it is
$strString = "Hello World" write-host $strString function ftest{ $test = "Test" write-host $test }
EDIT: I tried upgrading to python 3.3 like was suggested in the first answer but I still can't get it to work. I used the command p = subprocess.Popen(['powershell.exe', "C:\\Users\\gu2124\\Desktop\\helloworld.ps1"], stdout=sys.stdout)
and am sure the file is there but am getting this error:
Traceback (most recent call last): File "<pyshell#3>", line 1, in <module> p = subprocess.Popen(['powershell.exe', "C:\\Users\\gu2124\\Desktop\\helloworld.ps1"], stdout=sys.stdout) File "C:\Python27\lib\subprocess.py", line 701, in __init__ errread, errwrite), to_close = self._get_handles(stdin, stdout, stderr) File "C:\Python27\lib\subprocess.py", line 848, in _get_handles c2pwrite = msvcrt.get_osfhandle(stdout.fileno()) UnsupportedOperation: fileno
We can run the Python script in PowerShell using the py command. To run the script using py command, we will need to mention the version of Python required to run the script and the name of the script file.
The echo command is used to print the variables or strings on the console. The echo command has an alias named “Write-Output” in Windows PowerShell Scripting language. In PowerShell, you can use “echo” and “Write-Output,” which will provide the same output.
Make sure you can run powershell scripts (it is disabled by default). Likely you have already done this. http://technet.microsoft.com/en-us/library/ee176949.aspx
Set-ExecutionPolicy RemoteSigned
Run this python script on your powershell script helloworld.py
:
# -*- coding: iso-8859-1 -*- import subprocess, sys p = subprocess.Popen(["powershell.exe", "C:\\Users\\USER\\Desktop\\helloworld.ps1"], stdout=sys.stdout) p.communicate()
This code is based on python3.4 (or any 3.x series interpreter), though it should work on python2.x series as well.
C:\Users\MacEwin\Desktop>python helloworld.py Hello World
I don't have Python 2.7 installed, but in Python 3.3 calling Popen
with stdout
set to sys.stdout
worked just fine. Not before I had escaped the backslashes in the path, though.
>>> import subprocess >>> import sys >>> p = subprocess.Popen(['powershell.exe', 'C:\\Temp\\test.ps1'], stdout=sys.stdout) >>> Hello World _
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