code: def h2o_H2OFrame_col_names():
      """
      Python API test: h2o.frame.H2OFrame.col_names(), h2o.frame.H2OFrame.columns()
  
      Copied from pyunit_colnames.py
      """
      iris_wheader = h2o.import_file(
          pyunit_utils.locate("smalldata/iris/iris_wheader.csv")
      )
      expected_names = [
          "sepal_len",
          "sepal_wid",
          "petal_len",
          "petal_wid",
          "class",
      ]
      assert (
          iris_wheader.col_names
          == expected_names
          == iris_wheader.columns
      ), "Expected {0} for column names but got {1}".format(
          expected_names, iris_wheader.col_names
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: h2o_H2OFrame_col_names() without return types