save project

my_search.py

@@ -7,11 +7,20 @@ 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):
+    low=0
+    high=len(alist)-1
+    mid=(low+high)//2
     while low<=high:
     while low<=high:
-        low=0
-        high=len(alist)-1
-        mid=(low+high)//2
-
+        mid=(high+low)//2
+        guess=alist[mid]
+        if guess==num:
+            print('找到了',mid)
+            break
+        elif guess<num:
+            low=mid+1
+        else:
+            high=mid-1
+binary_search(alist,10)