title: ImportError: No module named 'ipdb'
body: <p>I'm new to python and I'm trying to use the interactive python debugger in the standard python package.  Whenever I run "import ipdb" in my text editor (atom) or in the command line through iPython then I get the error:
  ImportError: No module named 'ipdb'</p>
  
  <p>Where is my ipdb module? It's still missing after I reinstalled python.</p>
  
  <p>Thanks!</p>