title: LF> os.system(filePath) alternative
body: <p>I'm having an issue due to the fact that in my Python code <code>os.system(filePath)</code> will execute but the code stops until I manually close the window of the opened PDF file.</p>
  
  <p>I would like to open a PDF file use openCV to capture my screen thus capturing the image of the file. This becomes an issue if the code does not run without me closing the window...</p>
  
  <p>CODE:</p>
  
  <pre><code>import numpy as np
  import shutil,os, cv2, SendKeys, win32com.client
  
  #While our In File has stuff in it
  while(os.listdir(pathForInFile)!=[]):
      for subdir, dirs, inFile in os.walk(pathForInFile):
          for fileName in inFile:
              filePath= subdir+os.sep+fileName
  
              os.system(filePath)
  
              print "THIS WILL RUN NOT UNTIL I CLOSE FILE"
  
              shell.SendKeys('{DOWN}')
  </code></pre>