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my_search.py

@@ -6,4 +6,20 @@ for i in range(1, 101):
 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
 
-def binary_search(alist,num):
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+def a(alist,num):
+    # 使用二分查找法，找出9和20在列表里面的索引
+    zhaode=int(input("请输入你要找的数:"))
+    num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+    min=0
+    max=len(num_list)-1
+    while min<=max:
+        mid=(min+max)//2
+        caide=num_list[mid]
+        if caide==zhaode:
+            return mid
+        elif caide<zhaode:
+            min=mid+1
+        elif caide>zhaode:
+            max=mid-1
+    return None
+B
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