python过滤字符串中不属于指定集合中字符的类实例

　　本文实例讲述了python过滤字符串中不属于指定集合中字符的类。分享给大家供大家参考。具体如下：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 # -*- coding: utf-8 -*- import sets class Keeper(object): def __init__(self, keep): self.keep = sets.Set(map(ord, keep)) def __getitem__(self, n): if n not in self.keep: return None return unichr(n) def __call__(self, s): return s.translate(self) makefilter = Keeper if __name__ == '__main__': just_vowels = makefilter('aeiouy') print just_vowels(u'four score and seven years ago') # 输出: ouoeaeeyeaao print just_vowels(u'tiger, tiger burning bright') # 输出: ieieuii

　　希望本文所述对大家的Python程序设计有所帮助。