code: def assertEqual(self, left, right):
      assert left == right, self.format_values(left, right)
  
imports: import numpy
  import pandas.util.testing
  from pandas_ml.compat import plotting
  from pandas.util.testing import assert_produces_warning, close, RNGContext, assert_index_equal, assert_series_equal, assert_frame_equal, assert_numpy_array_equal
label_desc: Use image node_id 4 for calling the TestCase obj's underlying member method code with example usage: obj.assertEqual(left, right) without return types