Running powershell script within python script how to make python print the powershell output while it is running

Question

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  39 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  lt module gt      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   lt string gt    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   39 fileno  39  is that it is because I am messing with the stdout incorrectly  I looked a around more and I found this Why won  39 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    lt bound method Popen communicate of  lt subprocess Popen object at 0x00000000026E4A90 gt  gt    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   lt pyshell 3 gt    line 1  in  lt module gt      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

User · Accepted Answer

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

User · Answer

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

[python] Running powershell script within python script, how to make python print the powershell output while it is running

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