title: dir_util.copy_tree fails after shutil.rmtree
body: <p>I'm trying to copy a folder to another one after it has been deleted:</p>
  
  <pre><code>for i in range(0,3):
     try:
        dir_util.remove_tree("D:/test2")
   #     shutil.rmtree("D:/test2")
        print "removed"
     except: pass
  
     dir_util.copy_tree("D:/test1", "D:/test2")
  
     print i
  </code></pre>
  
  <p>D:/test1 contains one empty file called test_file.
  If I use dir_util.remove_tree it works fine, but after shutil.rmtree it works only once, on second iteration it fails. Output:</p>
  
  <pre><code>removed
  0
  removed
  Traceback (most recent call last):
    File "test.py", line 53, in &lt;module&gt;
      dir_util.copy_tree("D:/test1", "D:/test2")
    File "C:\Python27\lib\distutils\dir_util.py", line 163, in copy_tree
      dry_run=dry_run)
    File "C:\Python27\lib\distutils\file_util.py", line 148, in copy_file
      _copy_file_contents(src, dst)
    File "C:\Python27\lib\distutils\file_util.py", line 44, in _copy_file_contents
      fdst = open(dst, 'wb')
  IOError: [Errno 2] No such file or directory: 'D:/test2\\test_file'
  </code></pre>
  
  <p>It is more convenient for me to use shutil.rmtree because it allows error handling for removing read-only files.
  What is the difference between dir_util.remove_tree and shutil.rmtree? Why doesn't copy_tree work after rmtree second time?</p>
  
  <p>I'm running Python 2.7.2 on Windows 7</p>