save project

my_search.py

+# 使用二分查找法，找出9和20在列表里面的索引
 import random
 import random
-
-alist = []
-for i in range(1, 101):
+alist=[]
+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
+def binary_search(alist,num):
+    low=0
+    high=len(num_list)-1
 
 
-def binary_search(alist,num):
+    while low<=high:
\ No newline at end of file
+        mid=(low+high)//2
+        guess=alist[mid]
+    if guess==num:
+            return mid
+    elif guess<num:
+        low=mid+1
+    else:
+        high=mid-1
+    return None
+result=binary_search(alist,num)
+print("a:",num)
+print("b:",result)