save project

my_search.py

@@ -7,3 +7,18 @@ 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
 
 def binary_search(alist,num):
+    low = 0
+    high = len(alist)-1
+    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        
+result=  binary_search(alist,num)
+print(num)
+print(result)