code: def _trimSegmentsInCell(self, colIdx, cellIdx, segList, minPermanence,
                            minNumSyns):
      
      # Fill in defaults
      if minPermanence is None:
        minPermanence = self.connectedPerm
      if minNumSyns is None:
        minNumSyns = self.activationThreshold
  
      # Loop through all segments
      nSegsRemoved, nSynsRemoved = 0, 0
      segsToDel = [] # collect and remove segments outside the loop
      for segment in segList:
  
        # List if synapses to delete
        synsToDel = [syn for syn in segment.syns if syn[2] < minPermanence]
  
        if len(synsToDel) == len(segment.syns):
          segsToDel.append(segment) # will remove the whole segment
        else:
          if len(synsToDel) > 0:
            for syn in synsToDel: # remove some synapses on segment
              segment.syns.remove(syn)
              nSynsRemoved += 1
          if len(segment.syns) < minNumSyns:
            segsToDel.append(segment)
  
      # Remove segments that don't have enough synapses and also take them
      # out of the segment update list, if they are in there
      nSegsRemoved += len(segsToDel)
      for seg in segsToDel: # remove some segments of this cell
        self._cleanUpdatesList(colIdx, cellIdx, seg)
        self.cells[colIdx][cellIdx].remove(seg)
        nSynsRemoved += len(seg.syns)
  
      return nSegsRemoved, nSynsRemoved
docs: This method goes through a list of segments for a given cell and
      deletes all synapses whose permanence is less than minPermanence and deletes
      any segments that have less than minNumSyns synapses remaining.
  
      :param colIdx        Column index
      :param cellIdx       Cell index within the column
      :param segList       List of segment references
      :param minPermanence Any syn whose permamence is 0 or < minPermanence will
                           be deleted.
      :param minNumSyns    Any segment with less than minNumSyns synapses remaining
                           in it will be deleted.
  
      :returns: tuple (numSegsRemoved, numSynsRemoved)