title: python assigning key to dict
body: <p>I want to assign key to dict without value. So i want to assign date to the dict</p>
  
  <p>here my current code</p>
  
  <pre><code>desc_date = {}
  
  date = ' '.join(line_of_list[0:2])
  if desc_date.has_key(date):
      # Not sure how to assign date to desc_date now
  </code></pre>