bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: html_parser.
bs4解析網頁時報錯：bs4.FeatureNotFound: Couldn't find a tree builder with the features you requested: html_parser. Do you need to install a parser library?
原因：不可以使用 BeautifulSoup(html,'html_parser')
解決辦法：
1.安裝 pip install lxml
2.將BeautifulSoup(html,'html_parser') 改為BeautifulSoup(html,'lxml')
另：好像有人遇到的情況和我的正好相反，由於剛開始接觸python，還不是很瞭解具體原因，希望後期能夠了解具體的原因。
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