title: How to insert NULL value in SQLAlchemy?
body: <p>I've a <code>Table</code> with the following column:</p>
  
  <pre><code>Column('type', String(128))
  </code></pre>
  
  <p>How do I set this column to NULL when inserting a new row in database? </p>
  
  <p>I tried doing this:</p>
  
  <pre><code>self.type = NULL;
  </code></pre>
  
  <p>There is no <code>NULL</code> type in Python so I don't know how to do it.</p>