save project

my_search.py

@@ -6,4 +6,21 @@ 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(lista,n):
+    low=0
+    high=len(lista)-1
+    mid=(low+high)//2
+    guess=lista[mid]
+    while low<=high: 
+        mid=(low+high)//2
+        guess=lista[mid]
+        if guess==n:
+            return "找到了",str(mid) 
+        elif guess>n:
+            high=mid-1
+        elif guess<n:
+            low=mid+1
+    
+    return "没有"
+print(binary_search(alist,num))