code: def test_stat_functions_with_no_numeric_columns(self):
      pdf = pd.DataFrame(
          {
              "A": ["a", None, "c", "d", None, "f", "g"],
              "B": ["A", "B", "C", None, "E", "F", None],
          }
      )
      psdf = ps.from_pandas(pdf)
  
      self._test_stat_functions(pdf, psdf)
  
imports: import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase, SPARK_CONF_ARROW_ENABLED
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 4 for calling the StatsTestsMixin obj's underlying member method code with example usage: obj.test_stat_functions_with_no_numeric_columns() without return types