title: combine 2 directories with it subdirectories
body: <p>i have a problem with combining 2 folder with it subdirectories, i have 2 folder source. i named it : <code>test-2</code> and <code>test-2</code> and path to these folder is <code>output/test-2</code> and <code>output/test-4</code></p>
  
  <p>i combined it with this line:</p>
  
  <pre><code>merged_folder_path = 'merged/dir/output'
  shutil.copy(result_1_path, merged_folder_path)
  shutil.copy(result_2_path, merged_folder_path)
  </code></pre>
  
  <p>but it get error: </p>
  
  <pre><code>Traceback (most recent call last):
    File "jamu.py", line 769, in &lt;module&gt;
      main(sys.argv)
    File "jamu.py", line 757, in main
      shutil.copy(result_1_path, merged_folder_path)
    File "C:\Python27\lib\shutil.py", line 119, in copy
      copyfile(src, dst)
    File "C:\Python27\lib\shutil.py", line 82, in copyfile
      with open(src, 'rb') as fsrc:
  IOError: [Errno 13] Permission denied: 'output/test-2'
  </code></pre>
  
  <p>is something wrong with my code?</p>