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ioiioi
V2EX  ›  Python

如何截取字符串?

  •  
  •   ioiioi · 2013-07-15 15:50:07 +08:00 · 3230 次点击
    这是一个创建于 4132 天前的主题,其中的信息可能已经有所发展或是发生改变。
    假设有一个tuple为[['128 MB', '27 PERCENT']]
    我想将128和27全部转换成int,该怎么截取字符串?
    4 条回复    1970-01-01 08:00:00 +08:00
    mrluanma
        1
    mrluanma  
       2013-07-15 16:13:53 +08:00
    >>> [int(x.split(None, 1)[0]) for x in ['128 MB', '27 PERCENT']]
    [128, 27]
    ioiioi
        2
    ioiioi  
    OP
       2013-07-15 16:24:52 +08:00
    @mrluanma
    perfect
    有个疑问,split(None, 1)是啥意思?
    mrluanma
        3
    mrluanma  
       2013-07-15 17:05:19 +08:00
    @ioiioi

    >>> help("".split)

    Help on built-in function split:

    split(...)
    S.split([sep [,maxsplit]]) -> list of strings

    Return a list of the words in the string S, using sep as the
    delimiter string. If maxsplit is given, at most maxsplit
    splits are done. If sep is not specified or is None, any
    whitespace string is a separator and empty strings are removed
    from the result.
    ToughGuy
        4
    ToughGuy  
       2013-07-16 08:58:49 +08:00
    import re

    [map(int, re.findall(r'\d+', x)) for x in ['128 MB', '27 PERCENT']]

    新手...
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