code: def segments(seg_type=None):
      
  
      for index in xrange(idaapi.get_segm_qty()):
          seg = Segment(index=index)
          if (seg_type is None) or (seg.type == seg_type):
              yield Segment(index=index)
docs: Iterate segments based on type
  
          Args:
              seg_type: type of segment e.g. SEG_CODE
  
          Returns:
              iterator of `Segment` objects. if seg_type is None , returns all segments
              otherwise returns only the relevant ones