docs: def addParts(parentPart, childPath, count, index):
      """
      BUILD A hierarchy BY REPEATEDLY CALLING self METHOD WITH VARIOUS childPaths
      count IS THE NUMBER FOUND FOR self PATH
      """
      if index == None:
          index = 0
      if index == len(childPath):
          return
      c = childPath[index]
      parentPart.count = coalesce(parentPart.count, 0) + count
  
      if parentPart.partitions == None:
          parentPart.partitions = FlatList()
      for i, part in enumerate(parentPart.partitions):
          if part.name == c.name:
              addParts(part, childPath, count, index + 1)
              return
  
      parentPart.partitions.append(c)
      addParts(c, childPath, count, index + 1)