python 之 OSError: Error reading file错误

 tree = etree.parse(page_text,parser=parser)
 File "src\lxml\etree.pyx", line 3521, in lxml.etree.parse
  File "src\lxml\parser.pxi", line 1859, in lxml.etree._parseDocument
  File "src\lxml\parser.pxi", line 1885, in lxml.etree._parseDocumentFromURL
  File "src\lxml\parser.pxi", line 1789, in lxml.etree._parseDocFromFile
  File "src\lxml\parser.pxi", line 1177, in lxml.etree._BaseParser._parseDocFromFile
  File "src\lxml\parser.pxi", line 615, in lxml.etree._ParserContext._handleParseResultDoc
  File "src\lxml\parser.pxi", line 725, in lxml.etree._handleParseResult
  File "src\lxml\parser.pxi", line 652, in lxml.etree._raiseParseError
OSError: Error reading file

原因
直接用etree.parse(page_text)，读取从网上爬取的HTML，而不是从文件中读取则会报错

 tree = etree.parse(page_text,parser=parser)

解决方案：
先使用etree.HTML(网上爬取的HTML)让其进行解析，然后再使用xpath()进行数据解析

 html = etree.HTML(page_text)
 content_list = html.xpath("//ul[@class='house-list-wrap']/li")