code: def assertDataframeEqual(self, a, b, msg):
      try:
          pd.testing.assert_frame_equal(a, b)
      except AssertionError as e:
          raise self.failureException(msg) from e
  
imports: import unittest
  import pandas
label_desc: Use image node_id 1 for calling the PandasTestCase obj's underlying member method code with example usage: obj.assertDataframeEqual(a, b, msg) without return types