def printf(format, *opts)
      if /(%*)%I/ =~ format
	format, opts = parse_printf_format(format, opts)
      end
      print sprintf(format, *opts)
    end
def printf(format, *opts)
      if /(%*)%I/ =~ format
	format, opts = parse_printf_format(format, opts)
      end
      print sprintf(format, *opts)
    end
extend printf