save project

my_search.py

 import random
 import random
-
 alist = []
 alist = []
 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 search(alist,num):
\ No newline at end of file
+    low = 0
+    high = len(alist)+1
+    while low <= high:
+        mid = (low+high)//2
+        guess_num = alist[mid]
+        if guess_num == num:
+            return mid
+        elif guess_num < num:
+            low = mid + 1
+        else:
+            high = mid - 1
+    return None
+a = search(alist,11)
+print(a)
\ No newline at end of file