save project

my_search.py

@@ -6,4 +6,27 @@ 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):
\ No newline at end of file
+def binary_search(alist,num):
+
+    low = 0
+    high = len(alist)-1
+
+    while low <= high:
+        mid = (high + low)//2
+        b = num_list[mid]
+        if b == num:
+            return mid
+        elif b < num:
+            low = mid + 1
+        elif b > num:
+            low = mid - 1
+    return None
+
+result = binary_search(alist,num)
+print("老师给的话是:",num)
+print("他在列表里的索引是:",result)
+
+
+
+
+