title: pdb.set_trace() not working
body: <p>When I insert <code>import pdb; pdb.set_trace()</code> in my code, it shows an error message:</p>
  
  <blockquote>
    <p>'module' object has attribute 'set_trace'</p>
  </blockquote>
  
  <p>In the <code>pdb.py</code> file, there is the <code>def set_trace()</code> function. How can it not work? </p>
  
  <p>Has anyone had the same problem and knows how to solve this?</p>