code: def write_channel(self, out_data):
          
          self._lock_netmiko_session()
          try:
              self._write_channel(out_data)
          finally:
              # Always unlock the SSH channel, even on exception.
              self._unlock_netmiko_session()
docs: Generic handler that will write to both SSH and telnet channel.
  
          :param out_data: data to be written to the channel
          :type out_data: str (can be either unicode/byte string)