Using subprocess to run Python script on Windows

Question

Is there a simple way to run a Python script on Windows Linux OS X   On the latter two  subprocess Popen   the script py   works  but on Windows I get the following error   Traceback  most recent call last     File  test functional py   line 91  in test functional     log   tvnamerifiy tmp    File  test functional py   line 49  in tvnamerifiy     stdout   PIPE   File  C  Python26 lib subprocess py   line 595  in   init       errread  errwrite    File  C  Python26 lib subprocess py   line 804  in  execute child     startupinfo  WindowsError   Error 193   1 is not a valid Win32 application        monkut s comment  The use case isn t clear  Why use subprocess to run a python script  Is there something preventing you from importing the script and calling the necessary function    I was writing a quick script to test the overall functionality of a Python-command-line tool  to test it on various platforms   Basically it had to create a bunch of files in a temp folder  run the script on this and check the files were renamed correctly   I could have imported the script and called the function  but since it relies on sys argv and uses sys exit    I would have needed to do something like    import sys import tvnamer sys argv append  -b     the folder   try      tvnamer main   except BaseException  errormsg      print type errormsg    Also  I wanted to capture the stdout and stderr for debugging incase something went wrong   Of course a better way would be to write the script in more unit-testable way  but the script is basically  done  and I m doing a final batch of testing before doing a  1 0  release  after which I m going to do a rewrite restructure  which will be far tidier and more testable   Basically  it was much easier to simply run the script as a process  after finding the sys executable variable  I would have written it as a shell-script  but that wouldn t have been cross-platform  The final script can be found here

User · Answer

Yes subprocess Popen cmd       shell True  works like a charm   On Windows the  py file extension is recognized  so Python is invoked to process it  on  NIX just the usual shebang    The path environment controls whether things are seen   So the first arg to Popen is just the name of the script   subprocess Popen   myscript py    arg1              shell True

User · Answer

How about this   import sys import subprocess  theproc   subprocess Popen  myscript py   shell   True  theproc communicate                                      This tells subprocess to use the OS shell to open your script  and works on anything that you can just run in cmd exe   Additionally  this will search the PATH for  myscript py  - which could be desirable

User · Answer

Just found sys executable - the full path to the current Python executable  which can be used to run the script  instead of relying on the shbang  which obviously doesn t work on Windows   import sys import subprocess  theproc   subprocess Popen  sys executable   myscript py    theproc communicate

User · Answer

It looks like windows tries to run the script using its own EXE framework rather than call it like   python  the script py   Try   subprocess Popen   python     the script py      Edit   python  would need to be on your path

User · Answer

When you are running a python script on windows in subprocess you should use python in front of the script name   Try   process   subprocess Popen  python  the script py

User · Answer

You are using a pathname separator which is platform dependent  Windows uses     and Unix uses

User · Answer

For example  to execute following with command prompt or BATCH file we can use this    C  Python27 python exe  C  Program files x86  dev appserver py  --host 0 0 0 0 --post 8080  C  blabla     Same thing to do with Python  we can do this   subprocess Popen   C  Python27 python exe    C   Program files x86   dev appserver py    --host    0 0 0 0    --port    8080    C   blabla    shell True    or  subprocess Popen   C  Python27 python exe    C  Program files x86  dev appserver py    --host    0 0 0 0    --port    8080    C  blabla    shell True

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