迭代地附加到Python中的字符串的有效方法？

Question

我正在编写一个Python函数来将文本拆分为单词,忽略指定的标点符号.这是一些工作代码.我不相信从列表中构造字符串(代码中的buf = [])是有效的.有没有人建议更好的方法来做到这一点？

def getwords(text, splitchars=' \t|!?.;:"'):
    """
    Generator to get words in text by splitting text along specified splitchars
    and stripping out the splitchars::

      >>> list(getwords('this is some text.'))
      ['this', 'is', 'some', 'text']
      >>> list(getwords('and/or'))
      ['and', 'or']
      >>> list(getwords('one||two'))
      ['one', 'two']
      >>> list(getwords(u'hola unicode!'))
      [u'hola', u'unicode']
    """
    splitchars = set(splitchars)
    buf = []
    for char in text:
        if char not in splitchars:
            buf.append(char)
        else:
            if buf:
                yield ''.join(buf)
                buf = []
    # All done. Yield last word.
    if buf:
        yield ''.join(buf)

Answer 1

http://www.skymind.com/~ocrow/python_string/讨论了在Python中连接字符串的几种方法,并评估了它们的性能.