save project

my_search.py

@@ -7,4 +7,22 @@ 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):
-    
+    bingo_num = 7
\ No newline at end of file
+    low = 0
+    high = len(alist)-1
+    while high>=low:
+        mid = (low+high)//2
+        guess = alist[mid]
+        if guess == num:
+            print("找到了:")
+            print(mid)
+            print(guess)
+            return mid
+        elif guess<num:
+            low = mid + 1
+        else:
+            high = mid - 1
+    return None
+
+result = binary_search(alist,num)
+print(result)
\ No newline at end of file