Python filters classes of characters in strings that do not belong to the specified collection

From , 3 Years ago, written in Python, viewed 79 times.

# -*- 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
 
#//python/5061

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Python filters classes of characters in strings that do not belong to the specified collection

Reply to "Python filters classes of characters in strings that do not belong to the specified collection"