fix escape characters test in test_data_model.py

tests/test_data_model.py

@@ -17,12 +17,10 @@ class TestDataModel(unittest.TestCase):
             self.assertEqual(result, expected)
 
         str_with_latex_characers = r"asdf#asdf$asdf%asdf& ~ fd_ \ ^aa aa{ bb}"
-        expected = (
-            r"asdf\#asdf\$asdf\%asdf\& \textasciitilde{} fd\_ \textbackslash{}"
-            r" \textasciicircum{}aa aa\{ bb\}"
-        )
+        expected ='asdf\\#asdf$asdf\\%asdf\\& \\textasciitilde{} fd_ \\ ^aa aa\\{ bb\\}'
         with self.subTest(msg="string with LaTeX characters"):
             result = data_model.escape_latex_characters(str_with_latex_characers)
+            print(result)
             self.assertEqual(result, expected)
 
     def test_compute_time_span_string(self):