title: Constraint Programming with Python
body: <p>I'm trying to write a simple script to solve a CSP. I'm currently using python-constraint <a href="https://github.com/DanielCasner/python-constraint" rel="nofollow">https://github.com/DanielCasner/python-constraint</a>.</p>
  
  <p>But I want to add a constraint over two specific variables in the problem. Is this possible? For instance, variable a and b should sum to 5.</p>
  
  <p>Thanks!</p>