save project

my_search.py

@@ -6,4 +6,18 @@ 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
+    less_num = num
+    high = len(alist)-1
+    low = alist[0]
+    while low <= high:
+        mid = (low+high) // 2
+        guess = alist[mid]
+        if guess == less_num:
+            return mid
+        elif guess < less_num:
+            low = mid+1
+        else:
+            high = mid-1
+binary_search(alist,num)
+print('给的数是',num)
\ No newline at end of file