save project

my_search.py

@@ -6,4 +6,20 @@ 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
+    low = 0
+    high = len(alist) - 1
+    while high >= low:
+        mid = (low+high) // 2
+        if num == alist[mid]:
+            return mid
+        elif num > alist[mid]:
+            low = mid + 1
+        elif num < alist[mid]:
+            high = mid - 1
+    # if high < low:
+    #     print("你好，您输入的数值好像不存在呢")
+
+print(num)
+result = binary_search(alist,num)
+print(result)
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