save project

my_search.py

@@ -5,14 +5,18 @@ for i in range(1, 101):
     alist.append(i)
     alist.append(i)
 num = random.choice(alist)
 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
     low=0
     high=len(alist)-1
     high=len(alist)-1
-    while low<=:
-        pass
-    if condition:
-        pass
-    elif expression:
-        
-        pass
+    while low <= high:
+        mid=(low+high)//2
+        if guess_num == num:
+            return mid
+        elif guess < num:
+            low = mid-1
+        else:
\ No newline at end of file
+            high=mid-1
+        return None
+reult-binary_search(alist,num)
+print('数字是：'，num)
+print('索引是：',result)          
\ No newline at end of file