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In [1]: from lxml import etree
I've got an HTML document:
In [2]: root = etree.fromstring(u'''<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">\n<HTML></HTML>''', etree.HTMLParser())
Its doctype is parsed correctly:
In [3]: root.getroottree().docinfo.doctype
Out[3]: u'<!DOCTYPE html PUBLIC "-//IETF//DTD HTML//EN">'
But when serializing it, I am losing it:
In [4]: etree.tostring(root.getroottree(), method='html')
Out[4]: '<html></html>'
What should I do to get that doctype serialized?
Debian GNU/Linux, Sid. Python 2.6.6. lxml 2.2.8-2.
969
The only way I've been able to get it to work so far is by using the default XML parser and adding a non-empty system URL to the document:
>>> html = etree.parse(StringIO('''<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML></HTML>'''))
>>> etree.tostring(html, method="xml")
'<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML/>'
>>> etree.tostring(html, method="html")
'<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML></HTML>'
The same thing using the HTMLParser results in the same docinfo, but not the desired output:
>>> html = etree.parse(StringIO('''<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN" " ">\n<HTML></HTML>'''), etree.HTMLParser())
>>> etree.tostring(html, method="html")
'<html></html>'
Bug, as mentioned in a comment to another answer: missing doctype when serialized. Fix in February 2015 to be released in version 3.5 of lxml.
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