title: Python: get or set value in dictionary by pointer of key
body: <p>How can I set a value in dictionary by reference?</p>
  
  <pre><code>def set(point):
      point=0
  
  dic={'pointer':22}
  set(dic['pointer'])
  
  print dic   # {'pointer': 0}
  </code></pre>
  
  <p>I must send one argument.</p>