Python列表切片(Python list slicing)

 我无法理解在这里做什么。 有人可以帮忙吗 
 
 我有几个列表： 
 
array = [7,8,2,3,4,10,5,6,7,10,8,9,10,4,5,12,13,14,1,2,15,16,17]
slice = [2, 4, 6, 8, 10, 12, 15, 17, 20, 22]
intervals = [12, 17, 22]
output = []
intermediate = []
 
 slice是我需要从切片array获得的索​​引列表。 interval是当slice[i] is interval[j]时用于停止切片的索引列表，其中i和j是循环变量。 我需要根据slice[i] is not interval[j]时的条件，根据slice和intervals从array形成一个列表列表 
 
intermediate =intermediate + array[slice[i]:slice[i+1]+1]
 
 在我的情况下： 
 
 当slice[i]和interval[j]相等于值12.所以我需要从array形成一个列表列表 
 
intermediate = array[slice[0]:slice[0+1]+1] + array[slice[2]:slice[2+1]+1] + array[slice[4]:slice[4+1]+1]
 
 这是 
 
intermediate  = array[2:(4+1)] + array[6:(8+1)] + array[10:(12+1)]  
 
 并且当slice[i] is interval[j] output = output + intermediate并且继续切片时。 
 
output = output + [intermediate]
 
 这是 
 
output = output + [array[2:(4+1)] + array[6:(8+1)] + array[10:(12+1)]]
 
 现在，间隔中的下一个值是17，所以直到我们在slice有17个，我们从array[slice[6]:slice[6+1]+1]形成另一个列表并将其添加到输出中。 这继续下去。 
 
 最终输出应该是： 
 
output = [array[slice[0]:slice[0+1]+1] + array[slice[2]:slice[2+1]+1] + array[slice[4]:slice[4+1]+1] , array[slice[6]:slice[6+1]+1], array[slice[8]:slice[8+1]+1]]
 
 这是 
 
output = [[2, 3, 4, 5, 6, 7, 8, 9, 10], [12, 13, 14], [15, 16, 17]]

I'm not able understand what to do here. Can someone help.
 
I've a few lists:
 
array = [7,8,2,3,4,10,5,6,7,10,8,9,10,4,5,12,13,14,1,2,15,16,17]
slice = [2, 4, 6, 8, 10, 12, 15, 17, 20, 22]
intervals = [12, 17, 22]
output = []
intermediate = []
 
slice is a list of indices I need to get from slicing array. interval is a list of indices used to stop the slicing when slice[i] is interval[j] where i and j are looping variables. I need to form a list of lists from array based on slice and intervals based on the condition that when slice[i] is not interval[j] 
 
intermediate =intermediate + array[slice[i]:slice[i+1]+1]
 
here in my case:
 
when slice[i] and interval[j] are equal for value 12. So I need to form a list of lists from array 
 
intermediate = array[slice[0]:slice[0+1]+1] + array[slice[2]:slice[2+1]+1] + array[slice[4]:slice[4+1]+1]
 
which is
 
intermediate  = array[2:(4+1)] + array[6:(8+1)] + array[10:(12+1)]  
 
and when slice[i] is interval[j] output = output + intermediate and the slicing is continued.
 
output = output + [intermediate]
 
which is
 
output = output + [array[2:(4+1)] + array[6:(8+1)] + array[10:(12+1)]]
 
now the next value in interval is 17 so till we have 17 in slice we form another list from array[slice[6]:slice[6+1]+1] and add this to the output. This continues.
 
The final output should be:
 
output = [array[slice[0]:slice[0+1]+1] + array[slice[2]:slice[2+1]+1] + array[slice[4]:slice[4+1]+1] , array[slice[6]:slice[6+1]+1], array[slice[8]:slice[8+1]+1]]
 
which is
 
output = [[2, 3, 4, 5, 6, 7, 8, 9, 10], [12, 13, 14], [15, 16, 17]]

原文：https://stackoverflow.com/questions/39187018