new_contents: # Source: http://stackoverflow.com/questions/242485/starting-python-debugger-automatically-on-error
  
  import sys
  
  def info(type, value, tb):
      if hasattr(sys, 'ps1') or not sys.stderr.isatty():
      # we are in interactive mode or we don't have a tty-like
      # device, so we call the default hook
          sys.__excepthook__(type, value, tb)
      else:
          import traceback, pdb
          # we are NOT in interactive mode, print the exception…
          traceback.print_exception(type, value, tb)
          print
          # …then start the debugger in post-mortem mode.
          # pdb.pm() # deprecated
          pdb.post_mortem(tb) # more “modern”
  
  sys.excepthook = info
  
subject: Create pdb_on_error.py