title: parallel read a python shelve object
body: <p>I want to parallelize the following for-loop that reads from a shelved python object</p>
  
  <pre><code>result = []
  for k in my_keys:
      val = my_shelved_db[k]
      result.append(val)
  </code></pre>
  
  <p>where : <code>my_shelved_db = shelve.open('my_file.db')</code></p>
  
  <p>Can someone give an example how this could be done</p>