save project

my_search.py

@@ -7,3 +7,17 @@ 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)//2
+        guees = alist[mid]
+        if guees == num:
+            return mid
+        elif guees < num:
+            low = mid + 1
+        else:
+            high = mid - 1
+        
+r = binary_search(alist,num)
+print(r)
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