title: Specify a datetime.date without a day in Python
body: <p>Is there a way to specify a <code>datetime.date</code> without a day like that:</p>
  
  <pre><code>datetime.date(year=1900, month=1, day=None)
  </code></pre>
  
  <p>I have a dataset with not full specified dates (sometimes only the year and the month is in it). I want to reprepsent that with a <code>datetime.date</code> without doing tricks.</p>