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我想编写一个程序来从 Twitter 获取推文，然后进行情感分析。我编写了以下代码，即使在导入所有必要的库后也出现错误。我对数据科学比较陌生，所以请帮助我。我无法理解此错误的原因：

class TwitterClient(object):


def __init__(self):

    # keys and tokens from the Twitter Dev Console
    consumer_key = 'XXXXXXXXX'
    consumer_secret = 'XXXXXXXXX'
    access_token = 'XXXXXXXXX'
    access_token_secret = 'XXXXXXXXX'
    api = Api(consumer_key, consumer_secret, access_token, access_token_secret)

    def preprocess(tweet, ascii=True, ignore_rt_char=True, ignore_url=True, ignore_mention=True, ignore_hashtag=True,letter_only=True, remove_stopwords=True, min_tweet_len=3):
        sword = stopwords.words('english')

        if ascii:  # maybe remove lines with ANY non-ascii character
            for c in tweet:
                if not (0 < ord(c) < 127):
                    return ''

        tokens = tweet.lower().split()  # to lower, split
        res = []

        for …