Fix tests for behaviour change in python 3.7

Author: simongibbons

pandas/tests/frame/test_api.py

@@ -263,12 +263,12 @@ def test_itertuples(self, float_frame):
         df3 = DataFrame({"f" + str(i): [i] for i in range(1024)})
         # will raise SyntaxError if trying to create namedtuple
         tup3 = next(df3.itertuples())
-        assert not hasattr(tup3, "_fields")
-        assert isinstance(tup3, tuple)
+        if PY37:
+            assert not hasattr(tup3, "_fields")
+        else:
+            assert hasattr(tup3, "_fields")
 
-    def test_itertuples_fallback_to_regular_tuples(self):
         # GH 28282
-
         df_254_columns = DataFrame([{f"foo_{i}": f"bar_{i}" for i in range(254)}])
         result_254_columns = next(df_254_columns.itertuples(index=False))
         assert isinstance(result_254_columns, tuple)