Detailed explanation of the character encoding problem when lxml processes xml

黄舟
Release: 2017-03-17 16:53:25
Original
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In order to simplify the problem, the content of xml is simplified into the following form:

<?xml version="1.0" encoding="gbk"?><DOCUMENT><da><![CDATA[中文,就是任性]]></da></DOCUMENT>
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Its encoding is gbk, and one of the nodes is a Chinese character
Use lxml The following exception occurred when extracting the value of the node

lxml.etree.XMLSyntaxError: Extra content at the end of the document
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The corresponding Python script at this time is:

tst = u'<?xml version="1.0" encoding="gbk"?><DOCUMENT><da><![CDATA[中文,就是任性]]></da></DOCUMENT>'
for event,element in etree.iterparse(BytesIO(tst.encode('utf-8'))):
    print("%s, %s" % (element.tag, element.text))
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But before simplification, another exception was reported

lxml.etree.XMLSyntaxError: input conversion failed due to input error, bytes 0x8B 0x2C 0xE6 0x9D
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No matter which exception it is, it is probably related to the encoding form of the characters.
After various attempts to no avail, I later saw this article on stackoverflow. The problem mentioned in the article is related to the encoding value in xml. I tried adding a piece of code

tst = u'<?xml version="1.0" encoding="gbk"?><DOCUMENT><da><![CDATA[中文,就是任性]]></da></DOCUMENT>'
tst = tst.replace('encoding="gbk"', 'encoding="utf-8"')
for event,element in etree.iterparse(BytesIO(tst.encode('utf-8'))):
    print("%s, %s" % (element.tag, element.text))
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Added a replacement statement, replace the previous encoding="gbk" with encoding:"utf-8"
So we finally got the result:

da, 中文,就是任性
DOCUMENT, None
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