title: How to auto complete in an iPython notebook while on ipdb?
body: <p>I am running some cell in an iPython notebook.
  I used the %%debug command in the head of the cell.
  Now, when i am on ipdb prompt and i hit the ctrl+space or tab,
  auto complete can't seem to be working.</p>
  
  <p>How to use auto complete? </p>