运行项目出现如下错误：
[nltk_data] Error loading stopwords:[nltk_data] Error loading averaged_perceptron_tagger:
解决方法如下：
前往地址：https://github.com/nltk/nltk_data
进入目录/packages/corpora/找到对应的文件stopwords.zip放到对应的文件之下
推荐整个nltk_data项目都下载695M大小，避免了其他问题无法下载的情况！
提取压缩文件
nltk_data-gh-pages.zipnltk_data-gh-pagespackages
所有文件到以下目录中
C:UsersAdministratorAppDataRoamingnltk_data
这里每个人安装的目录可能会不一样，我这里是上面的目录，
修改对应文件：
当前项目目录下venvLibsite-packageschatterbotutils.py
（有些童鞋的目录可能不在当前项目之下，可根据自己的配置找到对应的site-packages目录然后找到对应的文件进行修改）
需修改对应代码nltk_download_corpus('xxx')如下：
def download_nltk_stopwords():
"""
Download required NLTK stopwords corpus if it has not already been downloaded.
"""
nltk_download_corpus('corpora/stopwords')
def download_nltk_wordnet():
"""
Download required NLTK corpora if they have not already been downloaded.
"""
nltk_download_corpus('corpora/wordnet')
def download_nltk_averaged_perceptron_tagger():
"""
Download the NLTK averaged perceptron tagger that is required for this algorithm
to run only if the corpora has not already been downloaded.
"""
nltk_download_corpus('taggers/averaged_perceptron_tagger')
def download_nltk_vader_lexicon():
"""
Download the NLTK vader lexicon for sentiment analysis
that is required for this algorithm to run.
"""
nltk_download_corpus('sentiment/vader_lexicon')
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