title: Invalid mode error on Python Subprocess chmod using shlex
body: <p>I am using subprocess in python to change permissions on newly created files in my current directory on linux.</p>
  
  <p>When I run the following on the command line, it works as expected:</p>
  
  <pre><code>chmod 664 `find /path/path -type f`
  </code></pre>
  
  <p>I am trying to implement this in my python code with the following:</p>
  
  <pre><code>perms = "chmod 664 `find /path/path -type f`"
  command = shlex.split(perms)
  subprocess.call(command)
  </code></pre>
  
  <p>where command is the following:</p>
  
  <pre><code>['chmod', '664', '`find', '/path/path', '-type', 'f`']
  </code></pre>
  
  <p>I get the following error in my console:</p>
  
  <pre><code>chmod: invalid mode: `-type'
  </code></pre>
  
  <p>Is it something having to do with special characters?  </p>
  
  <p>Thanks</p>