save project

my_search.py

@@ -6,4 +6,23 @@ 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
+    hight=len(alist)-1
+    while low <=hight:
+        mid=(low+hight)//2
+        guess=alist[mid]
+        if guess==num:
+            print('找到了，是',mid)
+            break
+        elif guess>num:
+            hight=mid-1
+        else:
+            low=mid+1
+    return None
+result =binary_search(alist,num)
+print('数字是',num)
+
+
+
+    
\ No newline at end of file