save project

my_search.py

@@ -6,4 +6,17 @@ 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 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