title: Python SQLite3 not updating
body: <p>I don't know what I'm doing wrong, but my database is not updating! This is what I'm doing, so simple:</p>
  
  <pre><code>conn = sqlite3.connect('tarefas.db')
  c = conn.cursor()
  c.execute("UPDATE tarefas SET concluido = 1")
  conn.commit
  conn.close()
  </code></pre>
  
  <p>I want to update all rows in this column. When I execute this query in a sqlite manager it works. Why python just can't?</p>