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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_in_segmentlistdict(self, process_ids = None):
 		""" 		Return a segmentlistdict mapping instrument to in segment 		list. If process_ids is a sequence of process IDs, then 		only rows with matching IDs are included otherwise all rows 		are included. 		Note: the result is not coalesced, each segmentlist 		contains the segments listed for that instrument as they 		appeared in the table. 		"""

		seglists = segments.segmentlistdict()
		for row in self:
			ifos = row.instruments or (None,)
			if process_ids is None or row.process_id in process_ids:
				seglists.extend(dict((ifo, segments.segmentlist([row.in_segment])) for ifo in ifos))
		return seglists