save project

my_search.py

@@ -7,3 +7,19 @@ 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
+    while low <=high:
+        mid = (low+high) // 
+        guess = alist[mid]
+        if guess == num:
+            return mid
+        elif guess < num:
+            low = mid + 1
+        elif:
+            high = mid - 1
+    return None
+
+    resulf  = binary_search(alist, num)   
+    print("老师给的数是：",num)
+    print("它在列表里的索引是：",result)              
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