Calling a subprocess without having the system console open

Question

Im trying to start a wxPython app that (I have converted to an exe with py2exe) from a process that is running in the background.

The problem is that when the gui app opens, so does a console window (c:\windows\system\cmd.exe)

I had a look at this question where Alex Martelli suggests setting the creationflags paramater of Popen to 0x08000000 but this hasn't solved my problem.

Also I wonder if there is a better way of running a process in the background, at the moment I just changed the extension of the script to pyw and since it doesn't have a GUI then it isn't visible...

This is line that calls the subprocess

    subprocess.Popen(args="%s"%comPort,bufsize=0,
                     executable="myFrozen_WxpythonApp.exe",
                     creationflags=0x08000000, shell=False)

py2exe script

...

options = {'py2exe': {'compressed': 3,
                          'optimize': 2,
                          'excludes': excludes,
                          'packages': packages,
                          'dll_excludes': dll_excludes,
                          'bundle_files': 1,
                          'dist_dir': 'dist',
                          'xref': False,
                          'skip_archive': False,
                          'ascii': False,
                          #'packages': packages,
                        'custom_boot_script': '',
                         }
                }  

      setup(options=options, windows=["app.pyw"], zipfile=None, data_files=data_files)

---

Update:

As I explained in my answer to this question the problem was in the subprocess.Popen call.

The first string in the args parameter should be the name of the executable, the executable name can then be followed by any commands or data that needs to be passed to the subprocess.

Answer 1

I figured out what I was doing wrong after reading the documentation for subprocess.Popen

The first string in the args parameter should be the name of the executable. I didn't include the name of the executable as I thought that was taken care of with the executable paramater.