title: No readline support while using pdb.set_trace()
body: <p>I have an application running Python 2.6.X. Starting the Python interpreter in interactive mode (with or without using virtualenv): readline support working (command history).
  Starting my application with the same Python interpreter (virtualenv-ed or not): no readline support available when using <strong>pdb.set_trace()</strong>: cursor keys not working. Operating system is Linux.</p>