old_contents: import sys,os,code,copy
  import traceback
  from getopt import getopt,GetoptError
  from pprint import pprint
  from topo import *
  
  BANNER         = """
  Welcome to Topographica!
  
  Type help() for interactive help, or help(commandname) for info on a
  specific command.
  """
  
  def start(interactive=True):
      """
      Function that will display a banner, import topo into main,
      and change the prompt display.  Since this is part of the topo
      package, the topo.__init__ will already be evaluated when this
      file is imported.
      """
      sys.ps1        = 'Topographica> '
      if interactive:
          print BANNER
          try:
              import readline
          except ImportError:
              print "Module readline not available.\nHistory and completion support disabled."
          else:
          #set up command completion
              import rlcompleter
              readline.parse_and_bind("tab: complete")
  
  
new_contents: import sys
  from topo import *
  
  BANNER         = """
  Welcome to Topographica!
  
  Type help() for interactive help, or help(commandname) for info on a
  specific command.
  """
  
  def start(interactive=True):
      """
      Function that will display a banner, import topo into main,
      and change the prompt display.  Since this is part of the topo
      package, the topo.__init__ will already be evaluated when this
      file is imported.
      """
      sys.ps1        = 'Topographica> '
      if interactive:
          print BANNER
          try:
              import readline
          except ImportError:
              print "Module readline not available.\nHistory and completion support disabled."
          else:
          #set up command completion
              import rlcompleter
              readline.parse_and_bind("tab: complete")
  
  
subject: Cut some unused imports