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my_search.py

@@ -7,5 +7,18 @@ num = random.choice(alist)
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 # 请完善二分查找函数binary_search(),查找出num在列表alist里面的索引位置
 
 
 def binary_search(alist,num):
 def binary_search(alist,num):
-    
+    bingo_num=20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low=0
+high=len(num_list)-1
+mid=(low+high)//2
+guess_num=num_list[mid]
+if guess_num==bingo_num:
+    print("找到了，它在列表里的索引是：",mid)
+    break
+elif guess_num<bingo_num:
+    low=mid+1
+elif guess_num>bingo_num:
+    high=mid-1    
+