title: Python: os.system to execute meld command doesn't work in Windows
body: <p>I am writing a sublime plugin in Python. But I am still very new to Python language. I am using this line to call meld in Python: </p>
  
  <pre><code>if meld_cmd == None:
     meld_cmd = "C:\\Program Files (x86)\\Meld\\meld\\meld"
  os.system('"%s" "%s" "%s" ' %(meld_cmd, source_name, dest_name))
  </code></pre>
  
  <p>It doesn't work well in Windows. The cmd window just flashes for a sec (seem to execute something) then disappears. I print the executed string out in sublime and copy the string into cmd window and execute. It executes well in both admin and non-admin mode. And I tried to add a pause before executing: </p>
  
  <pre><code>os.system('pause &amp;&amp; "%s" "%s" "%s" ' %(meld_cmd, source_name, dest_name))
  </code></pre>
  
  <p>This works well too after clicking enter after the press any key to continue... line. </p>
  
  <p>Not sure how to debug this and what is the reason why it is failing. </p>