docs: def main():
      u"""Reads from command line args or stdin and prints a sparkline from the
      data.  Requires at least 2 data points as input.
      """
      import argparse
      from pkg_resources import require
  
      parser = argparse.ArgumentParser(description=main.__doc__)
      parser.add_argument(
          "data",
          nargs=argparse.REMAINDER,
          help="Floating point data, any delimiter."
      )
      parser.add_argument(
          "--version",
          "-v",
          action="store_true",
          help="Display the version number and exit."
      )
      args = parser.parse_args()
      
      if args.version:
          version = require("pysparklines")[0].version
          print (version)
          sys.exit(0)
  
      if os.isatty(0) and not args.data:
          parser.print_help()
          sys.exit(1)
      elif args.data:
          arg_string = u' '.join(args.data)
      else:
          arg_string = sys.stdin.read()
  
      try:
          output = sparkify(guess_series(arg_string))
      except:
          sys.stderr.write("Could not convert input data to valid sparkline\n")
          sys.exit(1)
  
      print (output.encode('utf-8', 'ignore'))