title: Appending tuples to lists
body: <p>What's the proper syntax for adding a recomposed tuple to a list?</p>
  
  <p>For example, if I had two lists:</p>
  
  <pre><code>&gt;&gt;&gt; a = [(1,2,3),(4,5,6)]
  &gt;&gt;&gt; b = [(0,0)]
  </code></pre>
  
  <p>Then I would expect the following to work:</p>
  
  <pre><code>&gt;&gt;&gt; b.append((a[0][0],a[0,2]))
  Traceback (most recent call last):
    File "&lt;stdin&gt;", line 1, in &lt;module&gt;
  TypeError: list indices must be integers, not tuple
  </code></pre>
  
  <p>Furthermore, when it informs me that indices must be integers, how come this works?</p>
  
  <pre><code>&gt;&gt;&gt; b.append((7,7))
  &gt;&gt;&gt; b
  [(0, 0), (7, 7)]
  </code></pre>