code: def test_pca_conversion(self):
      housing_file = "./data_storage/datasets/housing.csv"
      basic_json = "./data_storage/json/basic.json"
      simple = Polymer(housing_file)
      value = simple.run(basic_json, perform_PCA=True)
      trained_values = value.dataframe["train"]
      columns_transformed = True
      column_names = list(trained_values.columns)
      for name in column_names:
          if "#" not in name:
              columns_transformed = False
              break
      self.assertTrue(columns_transformed)
  
file_path: nylon/tests/tests.py
imports: import os, sys
  from nylon.query import Polymer
  import unittest
label_desc: Use image node_id 12 for calling the TestQueries obj's underlying member method code with example usage: obj.test_pca_conversion() without return types