title: Perfect hash function (i.e. no collisions) with same length
body: <p>I'm looking for a simple hash function that yields no collisions.</p>
  
  <p>I have an alphanumeric sequence (say 16 letter long) and I want each one of them to map to unique hashed value. Ideally, the hashed value is the same length as the original sequence (16 letter long).</p>
  
  <p>Is there a simple python hash function that achieves this?</p>