Update mandel-17.py

Author: mandel-17

top-k-frequent-elements/mandel-17.py

@@ -10,4 +10,5 @@ def topKFrequent(self, nums: List[int], k: int) -> List[int]:
             nums_dict[n] += 1
 
         frequent_rank = sorted(nums_dict.items(), key=lambda item:item[1], reverse=True)
-        return [frequent_rank[j][0] for j in range(k)]
+        return [frequent_rank[j][0] for j in range(k)]
+