code: def pser(self):
      return pd.Series([b"1", b"2", b"3"])
  
imports: import pandas
  from pandas.api.types import CategoricalDtype
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.pandas.tests.data_type_ops.testing_utils import OpsTestBase
label_desc: Use image node_id 1 for calling the BinaryOpsTestsMixin obj's underlying member method code with example usage: obj.pser() and returns: pd