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
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
-a=17
+a=10
 low=0
 high=9
 mid=(low+high)//2
 while True:
+    if low<=high:
         if num_list[mid]==a:
             print(mid)
             break
@@ -13,4 +14,6 @@ while True:
         else:
             low=mid+1
         mid=(low+high)//2
-    
\ No newline at end of file
+    else:
+        print('结束')
+        break
\ No newline at end of file