code: def test_table_get_num_views(self):
      data = [{"a": 1, "b": 2}, {"a": 3, "b": 4}]
      tbl = Table(data)
      assert tbl.get_num_views() == 0
      v1 = tbl.view()
      v2 = tbl.view()
      v3 = tbl.view()
      assert tbl.get_num_views() == 3
  
      v1.delete()
      v2.delete()
      assert tbl.get_num_views() == 1
      failed = False
      try:
          tbl.delete()
      except PerspectiveError:
          failed = True
      assert failed
      v3.delete()
      assert tbl.get_num_views() == 0
      tbl.delete()
  
imports: import sys
  from datetime import date, datetime
  from perspective.core.exception import PerspectiveError
  from perspective.table import Table
  from perspective.table._state import _PerspectiveStateManager
  from perspective.table.libpsppy import PerspectiveCppError, t_filter_op
  from pytest import raises
label_desc: Use image node_id 54 for calling the TestTable obj's underlying member method code with example usage: obj.test_table_get_num_views() without return types