save project

my_search.py

@@ -5,8 +5,17 @@ for i in range(1, 101):
     alist.append(i)
 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
-low=0
-high=len(alist)
+
 def binary_search(alist,num):
+    low=0
+    high=len(alist)
     while low<=high:
-        if 
\ No newline at end of file
+        mid=(low+high)//2
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid-1
+print(binary_search(alist,num))
\ No newline at end of file