save project

my_search.py

@@ -6,4 +6,22 @@ for i in range(1, 101):
 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):
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+def binary_search(,num):  # 使用二分查找法，找出9和20在列表里面的索引
+low=0
+high=len(alist)-1
+for i in range(2):
+    while True:
+        mid=(high+low)//2
+        guess=num_list[mid]
+        if guess==num:
+            print('找到了'+'num')
+            break
+        elif guess<num:
+            low=mid+1
+        elif guess>num:
+            high=mid-1
+        elif num_list[high]<num_list[low]:
+            print('木有')
+            break
+        print(mid)
+    num=20
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