code: def pser(self):
      return pd.Series(
          [
              "apples",
              "Bananas",
              "carrots",
              "1",
              "100",
              "",
              "\nleading-whitespace",
              "trailing-Whitespace    \t",
              None,
              np.NaN,
          ]
      )
  
imports: import pandas
  import numpy
  import re
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 1 for calling the SeriesStringOpsMixin obj's underlying member method code with example usage: obj.pser() and returns: pd