auto save

my_search.py

@@ -5,5 +5,16 @@ 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
-
+print(num)
 def binary_search(alist,num):
+    i=0
+    j=len(alist)-1
+    while i<=j:
+        mid=(i+j)//2
+        if alist[mid]==num:
+            return mid
+        elif alist[mid]>num:
+            j=mid-1
+        else:
+            i=mid+1
+print("找到了，索引是%s"%binary_search(alist,num))