Hi Schimon, You've been using Python's built-in ElementTree implementation (xml.etree.ElementTree).
This mailing list, and Xavier's guidance, is for the "lxml" package <https://lxml.de/>. So, ensure you've got lxml available within your project (e.g. "pip install lxml") and then import with: import lxml.etree as ET This allows your code below to run. ...although lxml's tutorial <https://lxml.de/tutorial.html> includes the package in the following manner: from lxml import etree If you import in this manner you'd need to update your code, changing the "ET" references to "etree", so something like: from lxml import tree e_feed = etree.Element("feed") e_feed.set("xmlns", "http://www.w3.org/2005/Atom";) xslt_reference = etree.ProcessingInstruction( "xml-stylesheet", "type=\"text/xml\" href=\"stylesheet.xsl\"") e_feed.insert(0, xslt_reference) etree.tostring(etree.ElementTree(e_feed)) Cheers aid > On 18 Jun 2025, at 20:10, Schimon Jehudah via lxml - The Python XML Toolkit > <lxml@python.org> wrote: > > Xavier. Good evening. > > I beg your pardon, > > Please kindly tell me from where did you import ET, as I receive this > error after ecevuting ET.tostring(ET.ElementTree(e_feed)). > > AttributeError: 'ElementTree' object has no attribute 'tag' > > Regards, > Schimon > > On Mon, 16 Jun 2025 08:04:01 +0200 > Xavier Morel <x...@odoo.com> wrote: > >> On 14/06/25 20:33, Schimon Jehudah via lxml - The Python XML Toolkit >> wrote:> Would it be sensible to allow a negative value: >>> >>> e_feed.insert(-1, xslt_reference) >> >> If you test this, you will find out that inserting at negative >> indexes is already a valid operation: `insert(-x, el)` inserts at >> index `x` *from the end*. >> >> This is the normal behaviour of indexing in Python. >> >> And if you were using lxml, which you are not (lxml and xml.etree are >> different packages), what you request would already work if you used >> the `addprevious` method: >> >>>>> e_feed = ET.Element("feed") >>>>> e_feed.set("xmlns", "http://www.w3.org/2005/Atom";) >>>>> xslt_reference = ET.ProcessingInstruction( >> ... "xml-stylesheet", >> ... "type=\"text/xml\" href=\"stylesheet.xsl\"") >>>>> >>>>> ET.tostring(ET.ElementTree(e_feed)) >> b'<feed xmlns="http://www.w3.org/2005/Atom"/>' >>>>> e_feed.addprevious(xslt_reference) >>>>> ET.tostring(ET.ElementTree(e_feed)) >> b'<?xml-stylesheet type="text/xml" href="stylesheet.xsl"?><feed >> xmlns="http://www.w3.org/2005/Atom"/>' >> >> The way you namespace the element is also very much a serialization >> hack, you should create the element using a QName tag or Clark's >> Notation. You can use `register_namespace` to force the namespace >> prefix if you care: >> >>>>> doc1 = ET.Element('{foo}bar') >>>>> doc2 = ET.Element(ET.QName('foo', 'bar')) >>>>> ET.tostring(doc1), ET.tostring(doc2) >> (b'<ns0:bar xmlns:ns0="foo" />', b'<ns0:bar xmlns:ns0="foo" />') >>>>> ET.register_namespace('', 'foo') >>>>> ET.tostring(doc1), ET.tostring(doc2) >> (b'<bar xmlns="foo" />', b'<bar xmlns="foo" />') >> >> in lxml you can also use the nsmap feature: >> >>>>> etree.tostring(etree.Element('{foo}bar', nsmap={None: 'foo'})) >> b'<bar xmlns="foo"/>' > _______________________________________________ > lxml - The Python XML Toolkit mailing list -- lxml@python.org > To unsubscribe send an email to lxml-le...@python.org > https://mail.python.org/mailman3//lists/lxml.python.org > Member address: a...@logic.org.uk
_______________________________________________ lxml - The Python XML Toolkit mailing list -- lxml@python.org To unsubscribe send an email to lxml-le...@python.org https://mail.python.org/mailman3//lists/lxml.python.org Member address: arch...@mail-archive.com
