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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 low<=high:
+        mid = (low+high)//2
+        guess = alist[mid]
+        if guess == num:
+            print("找到了,索引是",mid)
+            break
+        elif guess<num:
+            low+=1
+        elif guess>num:
+            high-=1
+        else:
+            print('没有')
+binary_search(alist,num)
\ No newline at end of file