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]
-num=9
+num=3
 low=1
 low=1
 high=9
 high=9
 while True:
 while True:
@@ -8,7 +8,8 @@ while True:
     guess=num_list[mid]
     guess=num_list[mid]
     if guess == num:
     if guess == num:
         print("找到了")
         print("找到了")
-    elif guess > num:
+        break
+    elif guess < num:
         low = mid + 1
         low = mid + 1
     else:
     else:
         high = mid-1
         high = mid-1