请问 Python 中[::]这个用法什么意思? - V2EX
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WayToPlay

请问 Python 中[::]这个用法什么意思?

  •  
  •   WayToPlay Nov 3, 2015 11733 views
    This topic created in 3849 days ago, the information mentioned may be changed or developed.
    如 a=[1 ,2,3,4,5,6,7,8,9]

    那么 a[1::5]表示什么意思呢?
    13 replies    2015-11-05 09:58:15 +08:00
    TimePPT
        1
    TimePPT  
    PRO
       Nov 3, 2015   1
    a[start_index: end_index : step]

    请学会 google 以及查阅官方文档
    WayToPlay
        2
    WayToPlay  
    OP
       Nov 3, 2015
    @TimePPT
    问之前已经查阅过资料,未果。
    看过你的回复已经明白了,非常感谢。
    ChiChou
        3
    ChiChou  
       Nov 3, 2015   1
    slice 操作,在 REPL 里跑一下就可以看到效果啦。

    话说不带任何数字的话 [::] 是复制一份的意思
    WayToPlay
        4
    WayToPlay  
    OP
       Nov 3, 2015
    @ChiChou

    多谢
    FrankFang128
        5
    FrankFang128  
       Nov 3, 2015   1
    这个还真是不好搜索
    heaton_nobu
        6
    heaton_nobu  
       Nov 3, 2015   1
    关键词: python 切片
    xyok
        7
    xyok  
       Nov 3, 2015 via Smartisan T1   1
    敲一下代码试验几个数字组合就出来了,搜索都没必要
    lxy42
        8
    lxy42  
       Nov 3, 2015
    话说这个 slice 的特性其它语言有吗?
    ljcarsenal
        9
    ljcarsenal  
       Nov 3, 2015 via Android
    @lxy42 js 都有啊 好像 go 也有
    poke707
        10
    poke707  
       Nov 4, 2015 via Android
    @TimePPT 请教一下遇上类似特殊符号的问题,怎样知道关键字?貌似搜索引擎会忽略符号。
    记得当初我接触 Python 的列表推导式用 “[i for i in range() ]” 都搜不到思路。
    piapia
        11
    piapia  
       Nov 4, 2015
    @poke707 还是要一点一点搜吧,今天刚好遇到列表推导式,"for 循环 简写"我就这么搜的。。
    TtiGeR
        12
    TtiGeR  
       Nov 4, 2015   1
    WayToPlay
        13
    WayToPlay  
    OP
       Nov 5, 2015
    @TtiGeR

    十分感谢!
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