@@ -283,10 +283,8 @@ class Learner1D(BaseLearner):

             # Calculate how many points belong to each interval.

             x_scale = self._scale[0]

-            quals = []

-            for x, loss in self.losses_combined.items():

-                quality = -loss if not math.isinf(loss) else -(x[1] - x[0]) / x_scale

-                quals.append((quality, x, 1))

+            quals = [((-loss if not math.isinf(loss) else -(x[1] - x[0]) / x_scale, x, 1))

+                     for x, loss in self.losses_combined.items()]

             heapq.heapify(quals)

             for point_number in range(n):