save project

my_search.py

 import random
 import random
 
 
-alist = []
+alist = [1,1,1,1,1,1,1,1,1,1,1,1,3,3,3,2,6,5,5,4]
 for i in range(1, 101):
 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):
\ No newline at end of file
+    low=0
+    high=len(alist)-1
+    while low<=high:
+        mid=(low+high)//2
+        guss=alist[mid]
+        if guss==num:
+            return mid
+            elif guss<num:
+                low=mid-1
+            else:
+                high=mid+1
+        return None
+
+result = bbi(alist,num)
+print(result)
\ No newline at end of file