save project

my_search.py

@@ -6,4 +6,20 @@ 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):
+def binary_search(alist,num):
\ No newline at end of file
+    low=0
+    high=len(alist)-1
+    while True:
+        mid=(low+high)//2#中间索引值
+        guess=alist[mid]#中间索引位置对应的数
+        if guess==num:
+            print('找到了')
+            return mid
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid-1
+    return None
+result=binary_search(alist,num)
+print(result)
+print('找到的数是',num,'它在列表中的索引值为',result)
\ No newline at end of file