save project

my_search.py

@@ -9,5 +9,17 @@ num = random.choice(alist)
 def binary_search(alist,num):
     low = 0
     high = len(alist)-1
-    while
+    while low < high:
+        mid = (low + high) //2
+        guess = alist[mid]
+        if guess == num:
+            return mid
+        elif guess < num:
+            low = mid + 1
+        else:
+            high = mid - 1
+    return None
+reult = binary_search(alist_num)
+print('老师要找的数是:',num)
+print('它在列表里的索引是:',result)
         
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