save project

my_search.py

@@ -10,4 +10,16 @@ def binary_search(alist,num):
     low = 0
     high = len(alist)-1
     while low <= high:
-        
\ No newline at end of file
+        mid = (low + high) // 2
+        guess = alist[mid]
+        if guess == num:
+            return mid
+        elif guess < num:
+            low = mid + 1
+        else:
+            high = 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)