code: def extend(self, other):
          
          if len(self.timestamps):
              last_stamp = self.timestamps[-1]
          else:
              last_stamp = 0
          if len(other):
              other_first_sample = other.timestamps[0]
              if last_stamp >= other_first_sample:
                  timestamps = other.timestamps + last_stamp
              else:
                  timestamps = other.timestamps
  
              if self.invalidation_bits is None and other.invalidation_bits is None:
                  invalidation_bits = None
              elif self.invalidation_bits is None and other.invalidation_bits is not None:
                  invalidation_bits = np.concatenate(
                      (np.zeros(len(self), dtype=bool), other.invalidation_bits)
                  )
              elif self.invalidation_bits is not None and other.invalidation_bits is None:
                  invalidation_bits = np.concatenate(
                      (self.invalidation_bits, np.zeros(len(other), dtype=bool))
                  )
              else:
                  invalidation_bits = np.append(
                      self.invalidation_bits, other.invalidation_bits
                  )
  
              result = Signal(
                  np.append(self.samples, other.samples, axis=0),
                  np.append(self.timestamps, timestamps),
                  self.unit,
                  self.name,
                  self.conversion,
                  self.comment,
                  self.raw,
                  self.master_metadata,
                  self.display_name,
                  self.attachment,
                  self.source,
                  self.bit_count,
                  self.stream_sync,
                  invalidation_bits=invalidation_bits,
                  encoding=self.encoding,
              )
          else:
              result = self
  
          return result
docs: extend signal with samples from another signal
  
          Parameters
          ----------
          other : Signal
  
          Returns
          -------
          signal : Signal
              new extended *Signal*