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ioiioi
V2EX  ›  Python

如何截取字符串?

  •  
  •   ioiioi · Jul 15, 2013 · 4136 views
    This topic created in 4824 days ago, the information mentioned may be changed or developed.
    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 replies  •  1970-01-01 08:00:00 +08:00
    mrluanma
        1
    mrluanma  
       Jul 15, 2013
    >>> [int(x.split(None, 1)[0]) for x in ['128 MB', '27 PERCENT']]
    [128, 27]
    ioiioi
        2
    ioiioi  
    OP
       Jul 15, 2013
    @mrluanma
    perfect
    有个疑问,split(None, 1)是啥意思?
    mrluanma
        3
    mrluanma  
       Jul 15, 2013
    @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  
       Jul 16, 2013
    import re

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

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