save project

my_search.py

@@ -7,4 +7,19 @@ 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
+    # 使用二分查找法，找出9和20在列表里面的索引
+
+
+    low = 0
+    high = len (num_list)-1
+    while low <= high
+        mid = (low+high )//2
+        guess_num = num_list[mid]
+        if guess_num == bingo_num:
+            print("找到了，是",mid)
+            break
+        elif guess_num < bingo_num:
+            low = mid+1
+        elif guess_num > bingo_num:
+            high = mid-1
+