save project

my_search.py

@@ -6,4 +6,21 @@ 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 binary_search(alist,num):
+    low = 0
+    high = len(num_list)-1
+    while  low <= high:
+        mid  = (low+high) // 2
+        guess_num = num_list[mid]
+        if guess_num  == bingo_num:
+            print('找到了','它的索引是',mid)
+            break
+        elif  guess_num < bingo_num:
+            low = mid+1
+        else:
+            high = mid-1
+    return None
+
+result = binary_search(alist,num)
+print('老师给出的数是：',num)
+print('他在列表里的索引是',result)  
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