使用python lxml.etree獲取巨大的XML文件

Question

我想在Python中使用lxml.etree解析一個巨大的xml（> 200MB）。 我嘗試使用etree.parse加載XML文件，但由於文件大小，這不起作用：

etree.parse('file.xml')Traceback (most recent call last):
File "<stdin>", line 1, in <module>
  File "lxml.etree.pyx", line 2706, in lxml.etree.parse (src/lxml/lxml.etree.c:49958)
  File "parser.pxi", line 1500, in lxml.etree._parseDocument (src/lxml/lxml.etree.c:71797)
  File "parser.pxi", line 1529, in lxml.etree._parseDocumentFromURL (src/lxml/lxml.etree.c:72080)
  File "parser.pxi", line 1429, in lxml.etree._parseDocFromFile (src/lxml/lxml.etree.c:71175)
  File "parser.pxi", line 975, in lxml.etree._BaseParser._parseDocFromFile (src/lxml/lxml.etree.c:68173)
  File "parser.pxi", line 539, in lxml.etree._ParserContext._handleParseResultDoc (src/lxml/lxml.etree.c:64257)
  File "parser.pxi", line 625, in lxml.etree._handleParseResult (src/lxml/lxml.etree.c:65178)
  File "parser.pxi", line 565, in lxml.etree._raiseParseError (src/lxml/lxml.etree.c:64521)
lxml.etree.XMLSyntaxError: Excessive depth in document: 256 use XML_PARSE_HUGE option, line 1276, column 7

因為我想使用xpath表達式，我必須先解析文件。 我如何解析XML文件？ 如何使用XML_PARSE_HUGE在連接lxml.etree ？

謝謝！

Answer 1

嘗試創建自定義XMLParser實例：

from lxml.etree import XMLParser, parse
p = XMLParser(huge_tree=True)
tree = parse('file.xml', parser=p)