save project

my_search.py

@@ -6,4 +6,17 @@ for i in range(1, 101):
 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):
\ No newline at end of file
+    low = 0
+    high = len(alist)-1
+    while high >= low:
+        mid = (high + low)//2
+        if alist[mid]==num:
+            return mid
+        elif alist[mid]>num:
+            high = mid-1
+        else:
+            low = mid+1
+    return "no Found"
+flag = binary_search(alist,num)
+print(str(num) + "的索引是"+str(flag))
\ No newline at end of file