列表循环的一种方法是,先获取列表的下标,然后迭代列表的每一个下标。#下标遍历
#列表的元素变动了,循环的次数不会变化
supplies[pens,staplers,flame-throwers,bbinders]
for i in range(len(supplies)):print(supplies[i])
列表循环的另…
1661. 每台机器的进程平均运行时间 - 力扣(LeetCode)
select machine_id,round(sum(if(activity_type end,timestamp,-timestamp))/count(distinct process_id),3)
as processing_time from Activity group by machine_id
if(activity_type end,ti…