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]
-num=3
-low=1
-high=9
+num=7
+low=0 
+high=len(num_list)
 while True:
     mid=(low+high)//2
     guess=num_list[mid]