title: How can I copy one collection from MongoDB using pymongo and paste to another empty collection?
body: <ol>
  <li>I want to copy full collection (e.g. name 'home').</li>
  <li>Then do some changes in the 'home' collection or remove doc inside it (not a collection).</li>
  <li>And then replace changed 'home' collection to its default state from item 1.</li>
  </ol>
  
  <p>I do next: </p>
  
  <pre><code>db = client["database"]
  home = db['home'].find()  # get collection.
  db['home'].remove({})  # remove doc from home
  for i in home:
        self.db['home'].insert(i)
  </code></pre>
  
  <p>But the collection is empty.</p>