title: append list inside dictionary with update
body: <p>if i have below dictionary with one of the element is list, as follow:</p>
  
  <pre><code>myDict = dict(a=1, b='2', c=[])
  </code></pre>
  
  <p>how do I update myDict and at the same time append c </p>
  
  <p>e.g.</p>
  
  <pre><code>myDict .update(a='one', b=2, c=append('newValue'))
  myDict .update(a='1', b='two', c=append('anotherValue'))
  </code></pre>
  
  <p>and the final result should be:</p>
  
  <pre><code>myDict = a='1', b='two', c=['newValue', 'anotherValue']
  </code></pre>
  
  <p>in one statement....</p>