title: Are there efficiency differences in extend vs. adding vs. appending in Python?
body: <p>I refer to list operations:</p>
  
  <pre><code>L = myList + otherList
  L = myList.append([5])
  L = myList.extend(otherList)
  </code></pre>
  
  <p>I am curious if there are efficiency differences among these operations.</p>