def save_sentences_single(uid, text, output_dir, remove_non_english_chars=
    True, prefix=''):
    """save_sentence_single
    Write text to file 
    Parameters
    ==========
    uid: int or string
        a unique ID for the article
    text: str
        raw text of the article    
    output_dir: path
        full path to a plugins corpus directory
    """
    if prefix != '':
        prefix = '%s_' % prefix
    output_file = '%s/%s%s_sentences.txt' % (output_dir, uid, prefix)
    filey = open(output_file, 'wb')
    filey.write('%s\n' % text)
    filey.close()
