code: def test_dataframe_not_equal(self):
      # see GH#28839
      df1 = DataFrame({"a": [1, 2], "b": ["s", "d"]})
      df2 = DataFrame({"a": ["s", "d"], "b": [1, 2]})
      assert df1.equals(df2) is False
  
imports: import numpy
  from pandas import DataFrame, date_range
  import pandas._testing
label_desc: Use image node_id 1 for calling the TestEquals obj's underlying member method code with example usage: obj.test_dataframe_not_equal() without return types