title: FileNotFoundError: [WinError 2] python 3.4 post commit hook
body: <p>processCommit.py script looks like:</p>
  
  <pre><code>cmd = 'C:\Program Files\VisualSVN Server\bin\svnlook changed %s -r %s' %   (repo, rev)
  Line 15 --&gt;**changed = subprocess.Popen(cmd,stdout=subprocess.PIPE).communicate()[0]**
  cmd = 'C:\Program Files\VisualSVN Server\bin\svnlook info %s -r %s' % (repo, rev)
  </code></pre>
  
  <p>Error that I am getting after commit :</p>
  
  <pre><code>Error: post-commit hook failed (exit code 1) with output:  
  Error: Traceback (most recent call last):  
  Error:   File "D:\Repositories\IapAdmin\hooks\processCommit.py", line 15, in &lt;module&gt;  
  Error:     changed = subprocess.Popen(cmd,stdout=subprocess.PIPE).communicate()[0]  
  Error:   File "C:\Python34\lib\subprocess.py", line 859, in __init__  
  Error:     restore_signals, start_new_session)  
  Error:   File "C:\Python34\lib\subprocess.py", line 1112, in _execute_child  
  Error:     startupinfo)  
  Error: FileNotFoundError: [WinError 2] The system cannot find the file specified  
  </code></pre>