save project

my_search.py

@@ -7,4 +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
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+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guess=alist[mid]
+        if guess==num:
+            return mid
+        elif guess<mum:
+            low=mid=+1
+        else:
+            high=mid=-1
+    return NotImplemented
+result=binary_search(num_list,2)
+print(result)
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