code: def test_table_index_from_schema(self):
      data = [{"a": 1, "b": 2}, {"a": 1, "b": 4}]
      tbl = Table({"a": int, "b": int}, index="a")
      assert tbl.size() == 0
      tbl.update(data)
      assert tbl.view().to_records() == [{"a": 1, "b": 4}]
  
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 42 for calling the TestTable obj's underlying member method code with example usage: obj.test_table_index_from_schema() without return types