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my_search.py

@@ -7,19 +7,20 @@ 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 a(alist,num):
 def a(alist,num):
-
+    # 使用二分查找法，找出9和20在列表里面的索引
+    zhaode=int(input("请输入你要找的数:"))
+    num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
     min=0
     min=0
-    max=len(alist)-1
+    max=len(num_list)-1
     while min<=max:
     while min<=max:
         mid=(min+max)//2
         mid=(min+max)//2
-        caide=alist[mid]
-        if caide==num:
+        caide=num_list[mid]
+        if caide==zhaode:
             return mid
             return mid
-        elif caide<num:
+        elif caide<zhaode:
             min=mid+1
             min=mid+1
-        else:
+        elif caide>zhaode:
             max=mid-1
             max=mid-1
     return None
     return None
 B=a(alist,num)
 B=a(alist,num)
-print("老师给的数是",num)
-print("他在列表里的索引是",B)
+print
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