[已解决]列表中[2:4]与[2: 4]的区别，一个中间无括号一个有括号

念123

s = [1, 2, 3, 4, 5]
s[2:4] = []
s
[1, 2, 5]
s[2: 4] = []
s
[1, 2]
大神们，为什么这结果不一样

最佳答案

月排行榜 / 总排行榜

ba21

2022-7-18 11:12:32

1

s = [1, 2, 3, 4, 5]
s[2:4] = []
s
[1, 2, 5]

2

s = [1, 2, 5]
s[2: 4] = []
s
[1, 2]

再明显不过了，2次替换后的结果。

>>> s = [1, 2, 3, 4, 5]
>>> s.pop(2)
3
>>> s
[1, 2, 4, 5]
>>> s.pop(2)
4
>>> s
[1, 2, 5]

跳转到最佳答案楼层

ba21

1

s = [1, 2, 3, 4, 5]
s[2:4] = []
s
[1, 2, 5]

2

s = [1, 2, 5]
s[2: 4] = []
s
[1, 2]

再明显不过了，2次替换后的结果。

>>> s = [1, 2, 3, 4, 5]
>>> s.pop(2)
3
>>> s
[1, 2, 4, 5]
>>> s.pop(2)
4
>>> s
[1, 2, 5]

wp231957

s 在发生变化

念123

我好蠢

hornwong