save project

my_search.py

@@ -6,4 +6,20 @@ for i in range(1, 101):
 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):
\ No newline at end of file
+def binary_search(alist,num):
+    low=0 
+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guess=num_list[mid]
+        if guess == num:
+            print("找到了")
+            break
+        elif guess < num:
+            low = mid + 1
+        else:
+                high = mid-1
+            if low>high:
+                print("该数不存在")
+                break
+binary_search(alist,num )
\ No newline at end of file