save project

binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 使用二分查找法，找出9和20在列表里面的索引
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 for i in range(int(input("有几个数字"))):
 for i in range(int(input("有几个数字"))):
-    a=int(input("数字："))
+    guess=int(input("数字："))
     low=0
     low=0
     high=len(num_list)-1
     high=len(num_list)-1
     for i in range(len(num_list)+1):
     for i in range(len(num_list)+1):
         mid=(low+high)//2
         mid=(low+high)//2
-        if a==num_list[mid]:
+        if guess==num_list[mid]:
             print("找到了!索引是"+str(mid))
             print("找到了!索引是"+str(mid))
             break
             break
-        elif a<num_list[mid]:
+        elif guess<num_list[mid]:
             high=mid-1
             high=mid-1
-        elif a>num_list[mid]:
+        elif guess>num_list[mid]:
             low=mid+1
             low=mid+1
         if high<low:
         if high<low:
             print("找不到！")
             print("找不到！")