old_contents: """Jieba command line interface."""
  import sys
  import jieba
  from argparse import ArgumentParser
  
  parser = ArgumentParser(usage="%s -m jieba [options] filename" % sys.executable, description="Jieba command line interface.", epilog="If no filename specified, use STDIN instead.")
  parser.add_argument("-d", "--delimiter", metavar="DELIM", default=' / ',
                      nargs='?', const=' ',
                      help="use DELIM instead of ' / ' for word delimiter; or a space if it is used without DELIM")
  parser.add_argument("-D", "--dict", help="use DICT as dictionary")
  parser.add_argument("-u", "--user-dict",
                      help="use USER_DICT together with the default dictionary or DICT (if specified)")
  parser.add_argument("-a", "--cut-all",
                      action="store_true", dest="cutall", default=False,
                      help="full pattern cutting")
  parser.add_argument("-n", "--no-hmm", dest="hmm", action="store_false",
                      default=True, help="don't use the Hidden Markov Model")
  parser.add_argument("-q", "--quiet", action="store_true", default=False,
                      help="don't print loading messages to stderr")
  parser.add_argument("-V", '--version', action='version',
                      version="Jieba " + jieba.__version__)
  parser.add_argument("filename", nargs='?', help="input file")
  
  args = parser.parse_args()
  
  if args.quiet:
      jieba.setLogLevel(60)
  delim = text_type(args.delimiter)
  cutall = args.cutall
  hmm = args.hmm
  fp = open(args.filename, 'r') if args.filename else sys.stdin
  
  if args.dict:
      jieba.initialize(args.dict)
  else:
      jieba.initialize()
  if args.user_dict:
      jieba.load_userdict(args.user_dict)
  
  ln = fp.readline()
  while ln:
      l = ln.rstrip('\r\n')
      result = delim.join(jieba.cut(ln.rstrip('\r\n'), cutall, hmm))
      if PY2:
          result = result.encode(default_encoding)
      print(result)
      ln = fp.readline()
  
  fp.close()
  
new_contents: """Jieba command line interface."""
  import sys
  import jieba
  from argparse import ArgumentParser
  from ._compat import *
  
  parser = ArgumentParser(usage="%s -m jieba [options] filename" % sys.executable, description="Jieba command line interface.", epilog="If no filename specified, use STDIN instead.")
  parser.add_argument("-d", "--delimiter", metavar="DELIM", default=' / ',
                      nargs='?', const=' ',
                      help="use DELIM instead of ' / ' for word delimiter; or a space if it is used without DELIM")
  parser.add_argument("-D", "--dict", help="use DICT as dictionary")
  parser.add_argument("-u", "--user-dict",
                      help="use USER_DICT together with the default dictionary or DICT (if specified)")
  parser.add_argument("-a", "--cut-all",
                      action="store_true", dest="cutall", default=False,
                      help="full pattern cutting")
  parser.add_argument("-n", "--no-hmm", dest="hmm", action="store_false",
                      default=True, help="don't use the Hidden Markov Model")
  parser.add_argument("-q", "--quiet", action="store_true", default=False,
                      help="don't print loading messages to stderr")
  parser.add_argument("-V", '--version', action='version',
                      version="Jieba " + jieba.__version__)
  parser.add_argument("filename", nargs='?', help="input file")
  
  args = parser.parse_args()
  
  if args.quiet:
      jieba.setLogLevel(60)
  delim = text_type(args.delimiter)
  cutall = args.cutall
  hmm = args.hmm
  fp = open(args.filename, 'r') if args.filename else sys.stdin
  
  if args.dict:
      jieba.initialize(args.dict)
  else:
      jieba.initialize()
  if args.user_dict:
      jieba.load_userdict(args.user_dict)
  
  ln = fp.readline()
  while ln:
      l = ln.rstrip('\r\n')
      result = delim.join(jieba.cut(ln.rstrip('\r\n'), cutall, hmm))
      if PY2:
          result = result.encode(default_encoding)
      print(result)
      ln = fp.readline()
  
  fp.close()
  
subject: fix bug in __main__.py