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：
# -*- 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。