save project

my_search.py

@@ -6,4 +6,16 @@ for i in range(1, 101):
 num = random.choice(alist)
 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
 # 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):
+high=len(alist)-1
\ No newline at end of file
+low= 0
+def binary_search(alist,num):
+    while low<=high:
+        mid=(high+low)//2
+        guess_num=int(alist[mid])
+        if guess_num==num:
+            return mid
+        elif guess_num < num:
+            low=mid+1
+        elif guess_num > num:
+            high=mid-1
+            none