title: open file in finder or explorer on linux or unix
body: <p>I don't have any Mac OSx or Linux machine, but I want to implement the functionality like opening an explorer from a selected file path. </p>
  
  <p>for example </p>
  
  <pre><code>import subprocess
  subprocess.Popen('explorer "E://temp//"')
  </code></pre>
  
  <p>the above code opens windows explorer for a specified path, how to do it for Mac or Linux ?</p>