diff --git a/my_search.py b/my_search.py
index 6eaf4dc..9e8b357 100644
--- a/my_search.py
+++ b/my_search.py
@@ -6,4 +6,16 @@ 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=(low+high)//2
+        if alist[mid]==num:
+            return mid
+        elif alist[mid]<num:
+            low=mid+1
+        else:
+            high=mid-1
+x=binary_search(alist,3)
+print(x)
\ No newline at end of file