code: def testSizesWithNone(self):
      cl = VertexClustering(
          self.graph, [0, 0, 0, None, 1, 1, 2, None, 2, None]
      )
      self.assertTrue(cl.sizes() == [3, 2, 2])
  
imports: import math
  import random
  import unittest
  from igraph import Clustering, CohesiveBlocks, Cover, Graph, Histogram, InternalError, UniqueIdGenerator, VertexClustering, compare_communities, split_join_distance, set_random_number_generator
label_desc: Use image node_id 5 for calling the VertexClusteringTests obj's underlying member method code with example usage: obj.testSizesWithNone() without return types