CVE-2022-48560 Change code to be compatible with Python2

Author: rickprice

Lib/test/test_heapq.py

@@ -401,7 +401,8 @@ def test_comparison_operator_modifiying_heap(self):
         # when comparing objects as they can alter the heap
         class EvilClass(int):
             def __lt__(self, o):
-                heap.clear()
+                # heap.clear()
+                del heap[:]
                 return NotImplemented
 
         heap = []
@@ -412,12 +413,14 @@ def test_comparison_operator_modifiying_heap_two_heaps(self):
 
         class h(int):
             def __lt__(self, o):
-                list2.clear()
+                # list2.clear()
+                del list2[:]
                 return NotImplemented
 
         class g(int):
             def __lt__(self, o):
-                list1.clear()
+                # list1.clear()
+                del list1[:]
                 return NotImplemented
 
         list1, list2 = [], []