Python subprocess issue on Windows
Question: I'm trying to write a Python script to convert a bunch of images.

It's something like the following code (after a huge minimization):

    
    
    #!/usr/bin/python
    # -*- coding: utf-8 -*-
    from subprocess import call
    
    cmd = ' '.join(['convert.exe', '-resize', '110', 'foo\\a.jpg', 'bar\\a.jpg'])
    print cmd
    call(cmd)
    

I get the error below after executing it:

    
    
    Parameter not valid - 110
    

While when I copy / paste the string emitted from the script on the command
line the image convertion works perfectly. What did I miss?


Answer: I would say that the error is most likely the result of two things

  1. In the call command, try using `shell=True` as the second argument.
  2. You're using relative paths, and the working directory might not be the same for python as it is from your cmd shell.

