code: def test_frame_slice(self):
      iris = datasets.load_iris()
      df = pdml.ModelFrame(iris)
  
      expected = [".target"] + iris.feature_names
      self.assertEqual(df.columns.tolist(), expected)
  
      s = df[".target"]
      self.assertIsInstance(s, pdml.ModelSeries)
      s = s[1:5]
      self.assertIsInstance(s, pdml.ModelSeries)
  
      s = df[[".target"]]
      self.assertIsInstance(s, pdml.ModelFrame)
  
imports: import pytest
  import datetime
  import warnings
  import numpy
  import pandas
  import sklearn.datasets
  import sklearn.svm
  import pandas_ml
  import pandas_ml.util.testing
label_desc: Use image node_id 11 for calling the TestModelFrame obj's underlying member method code with example usage: obj.test_frame_slice() without return types