fixup! STYLE: fix pylint unnecessary-comprehension warnings

Author: Moisan

pandas/tests/groupby/test_grouping.py

@@ -946,7 +946,11 @@ def test_multi_iter_frame(self, three_group):
         df["k1"] = np.array(["b", "b", "b", "a", "a", "a"])
         df["k2"] = np.array(["1", "1", "1", "2", "2", "2"])
         grouped = df.groupby(["k1", "k2"])
-        groups = dict(grouped)
+        # calling `dict` on a DataFrameGroupBy leads to a TypeError,
+        # we need to use a dictionary comprehension here
+        groups = {
+            key: gp for key, gp in grouped
+        }  # pylint: disable=unnecessary-comprehension
         assert len(groups) == 2
 
         # axis = 1