old_contents: """Keysmith Default Interface"""
  
  import argparse
  import math
  import string
  
  import pkg_resources
  
  import keysmith
  
  
  def cli(parser=None):
      """Parse CLI arguments and options."""
      if parser is None:
          parser = argparse.ArgumentParser(prog=keysmith.CONSOLE_SCRIPT)
      parser.add_argument(
          '-d', '--delimiter',
          help='a delimiter for the samples (teeth) in the key',
          default=' ',
      )
      parser.add_argument(
          '-n', '--nsamples',
          help='the number of random samples to take',
          type=int,
          default=3,
          dest='nteeth',
      )
      parser.add_argument(
          '-p', '--population',
          help='alphanumeric, ascii_letters, digits, printable,'
               ' or a path to a file of newline-delimited items',
          default=pkg_resources.resource_filename('keysmith', 'words.txt'),
      )
      parser.add_argument(
          '--stats',
          help='show statistics for the key',
          default=False,
          action='store_true',
      )
      parser.add_argument(
          '--version',
          action='version',
          version='%(prog)s {0}'.format(keysmith.__version__),
      )
      return parser
  
  
  def main(args=None):
      """Execute CLI commands."""
  
      if args is None:
          args = cli().parse_args()
  
      seq = {
          'alphanumeric': string.ascii_letters + string.digits,
          'ascii_letters': string.ascii_letters,
          'digits': string.digits,
          'printable': string.printable,
      }.get(args.population)
      if seq is None:
          with open(args.population, 'r') as f:
              seq = f.read().splitlines()
  
      key = keysmith.key(seq=seq, nteeth=args.nteeth, delimiter=args.delimiter)
      print(key)
  
      if args.stats:
          print('* {0} characters'.format(len(key)))
          print('* {0} samples from a population of {1}'.format(args.nteeth, len(seq)))
          print('* entropy {sign} {bits} bits'.format(
              sign='<' if len(args.delimiter) < 1 else '~',
              bits=round(math.log(len(seq), 2) * args.nteeth, 2),
          ))
  
  
  if __name__ == '__main__':
      main()
  
new_contents: """Keysmith Default Interface"""
  
  import argparse
  import math
  import string
  import sys
  
  import pkg_resources
  
  import keysmith
  
  
  def cli(parser=None):
      """Parse CLI arguments and options."""
      if parser is None:
          parser = argparse.ArgumentParser(prog=keysmith.CONSOLE_SCRIPT)
      parser.add_argument(
          '-d', '--delimiter',
          help='a delimiter for the samples (teeth) in the key',
          default=' ',
      )
      parser.add_argument(
          '-n', '--nsamples',
          help='the number of random samples to take',
          type=int,
          default=3,
          dest='nteeth',
      )
      parser.add_argument(
          '-p', '--population',
          help='alphanumeric, ascii_letters, digits, printable,'
               ' or a path to a file of newline-delimited items',
          default=pkg_resources.resource_filename('keysmith', 'words.txt'),
      )
      parser.add_argument(
          '--stats',
          help='show statistics for the key',
          default=False,
          action='store_true',
      )
      parser.add_argument(
          '--version',
          action='version',
          version='%(prog)s {0}'.format(keysmith.__version__),
      )
      return parser
  
  
  def main(args=None):
      """Execute CLI commands."""
  
      if args is None:
          args = cli().parse_args()
  
      seq = {
          'alphanumeric': string.ascii_letters + string.digits,
          'ascii_letters': string.ascii_letters,
          'digits': string.digits,
          'printable': string.printable,
      }.get(args.population)
      if seq is None:
          try:
              with open(args.population, 'r') as f:
                  seq = f.read().splitlines()
          except OSError as ex:
              print(ex, file=sys.stderr)
              return 1
  
      key = keysmith.key(seq=seq, nteeth=args.nteeth, delimiter=args.delimiter)
      print(key)
  
      if args.stats:
          print('* {0} characters'.format(len(key)))
          print('* {0} samples from a population of {1}'.format(args.nteeth, len(seq)))
          print('* entropy {sign} {bits} bits'.format(
              sign='<' if len(args.delimiter) < 1 else '~',
              bits=round(math.log(len(seq), 2) * args.nteeth, 2),
          ))
  
      return 0
  
  
  if __name__ == '__main__':
      sys.exit(main())
  
subject: Add some error-handling for OSError