code: def test_update_df_datetime_partial(self):
      tbl = Table(
          {
              "a": [np.datetime64(datetime(2019, 7, 11, 11, 0))],
              "b": [1],
          },
          index="b",
      )
  
      update_data = pd.DataFrame(
          {"a": [datetime(2019, 7, 12, 11, 0)], "b": [1]}
      )
  
      tbl.update(update_data)
  
      assert tbl.view().to_dict() == {
          "a": [datetime(2019, 7, 12, 11, 0)],
          "b": [1],
      }
  
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 12 for calling the TestUpdatePandas obj's underlying member method code with example usage: obj.test_update_df_datetime_partial() without return types