bpo-41900: C14N 2.0 serialisation failed for unprefixed attributes when a default namespace was defined. by scoder · Pull Request #22474 · python/cpython · GitHub
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8 changes: 8 additions & 0 deletions Lib/test/test_xml_etree.py
5 changes: 5 additions & 0 deletions Lib/xml/etree/ElementTree.py
Original file line number Diff line number Diff line change
Expand Up @@ -1876,6 +1876,11 @@ def _qname(self, qname, uri=None):
self._declared_ns_stack[-1].append((uri, prefix))
return f'{prefix}:{tag}' if prefix else tag, tag, uri

if not uri:
# As soon as a default namespace is defined,
# anything that has no namespace (and thus, no prefix) goes there.
return tag, tag, uri

raise ValueError(f'Namespace "{uri}" is not declared in scope')

def data(self, data):
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