我為推文數據集編寫了下面的代碼，我想進行預處理，我刪除了#，網站但是我的刪除@user 和標點符號的代碼不起作用，我是 python 的新手，有人可以幫助我嗎？from nltk.corpus import stopwordsimport spacy, renlp = spacy.load('en')stop_words = [w.lower() for w in stopwords.words()]def sanitize(input_string):    """ Sanitize one string """    # normalize to lowercase     string = input_string.lower()    # spacy tokenizer     string_split = [token.text for token in nlp(string)]    # in case the string is empty     if not string_split:        return ''     names = re.compile('@[A-Za-z0-9_][A-Za-z0-9_]+')    string = [re.sub(names, '@USER', tweet) for tweet in input_string()]    #remove # and @    for punc in '":!#':       string = string.replace(punc, '')    # remove 't.co/' links    string = re.sub(r'http//t.co\/[^\s]+', '', string, flags=re.MULTILINE)    # removing stop words     string = ' '.join([w for w in string.split() if w not in stop_words])#punctuation   # string = [''.join(w for w in string.split() if w not in #string.punctuation) for w in string]    return string list = ['@Jeff_Atwood Thank you for #stackoverflow', 'All hail @Joel_Spolsky t.co/Gsb7V1oVLU #stackoverflow' ]list_sanitized = [sanitize(string) for string in tweets[:300]]list_sanitized[:50]