save project

my_search.py

@@ -8,4 +8,18 @@ num = random.choice(alist)
 
 
 def binary_search(alist,num):
 def binary_search(alist,num):
     low=0
     low=0
-    
+    high=len(alist)-1
+    while low<=high:  
+        mid=(low+high)//2
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid-1
+        return None
+result= binary_search(alist,num)
+print('老师给的数是：',num)
+print('他在列表里的索引是：',result)       
+  
\ No newline at end of file