save project

my_search.py

@@ -13,9 +13,12 @@ def binary_search(alist,num):
         mid=(low+high)//2
         mid=(low+high)//2
         guess=alist[mid]
         guess=alist[mid]
         if guess==num:
         if guess==num:
-            print("找到了，它在列表里的索引是:",mid)
-            break
+            return mid
         elif guess<num:
         elif guess<num:
             low=mid+1
             low=mid+1
-        elif guess>num:
+        else:
             low=mid-1
             low=mid-1
+    return None
+result=binary_search(alist,num)
+print("老师给的数是：",num)
+print("它在列表里的索引是",result)
\ No newline at end of file