title: Is there any chemical database written for python?
body: <p>I write script which needs to know atomic mass of tin. Is there a python database which has such info?</p>
  
  <p><strong>Edit</strong>:</p>
  
  <p><code>periodictable</code> is nice, but some libs are more rich in data. For example <code>gperiodic</code> program. </p>