code: def pyunit_categories():
      iris = h2o.import_file(
          pyunit_utils.locate("smalldata/iris/iris.csv")
      )
      category_list = iris["C5"].categories()
      print(category_list)
      assert set(category_list) == set(
          ["Iris-setosa", "Iris-versicolor", "Iris-virginica"]
      )
  
label_desc: Use image node_id 1 for calling a global function with example usage: pyunit_categories() without return types