code: def test_update_df_partial(self):
      tbl = Table(
          {"a": [1, 2, 3, 4], "b": ["a", "b", "c", "d"]}, index="b"
      )
  
      update_data = pd.DataFrame(
          {"a": [5, 6, 7, 8], "b": ["a", "b", "c", "d"]}
      )
  
      tbl.update(update_data)
  
      assert tbl.view().to_dict() == {
          "a": [5, 6, 7, 8],
          "b": ["a", "b", "c", "d"],
      }
  
imports: import numpy
  import pandas
  from datetime import date, datetime
  from pytest import mark
  from perspective.table import Table
label_desc: Use image node_id 10 for calling the TestUpdatePandas obj's underlying member method code with example usage: obj.test_update_df_partial() without return types