Fix unbounded sequence issue in DataFrame constructor

python/cudf/cudf/core/dataframe.py

@@ -843,8 +843,13 @@ def _init_from_list_like(self, data, index=None, columns=None):
             data = DataFrame.from_pandas(pd.DataFrame(data))
             self._data = data._data
         else:
-            data = list(itertools.zip_longest(*data))
-
+            if all(
+                isinstance(a, (abc.Iterable, abc.Sequence))
+                for a in data
+            ):
+                data = list(itertools.zip_longest(*data))
+            else:
+                raise TypeError("Inputs should be an iterable or sequence.")
             if columns is not None and len(data) == 0:
                 data = [
                     cudf.core.column.column_empty(row_count=0, dtype=None)

python/cudf/cudf/tests/test_dataframe.py

@@ -10243,3 +10243,15 @@ def test_dataframe_init_columns_named_index():
     pdf = pd.DataFrame(data, columns=columns)
 
     assert_eq(gdf, pdf)
+
+
+def test_dataframe_constructor_unbounded_sequence():
+    class A:
+        def __getitem__(self, key):
+            return 1
+
+    with pytest.raises(TypeError):
+        cudf.DataFrame([A()])
+
+    with pytest.raises(TypeError):
+        cudf.DataFrame({"a": A()})