code: def send_line(self, line, ending=None):
          
          if ending is None:
              ending = self.LINE_ENDING
          return self.send(line + ending)
docs: Write the string to the wire, followed by a newline. The newline string
          can be changed by changing ``nc.LINE_ENDING``.
  
          Aliases: sendline, writeline, write_line, writeln, sendln