New submission from Dmitry Chichkov <dchich...@gmail.com>: The namespace_separator parameter is hard coded in the cElementTree.XMLParser class disallowing the option of ignoring XML Namespaces with cElementTree library.
Here's the code example: from xml.etree.cElementTree import iterparse from StringIO import StringIO xml = """<root xmlns="http://www.very_long_url.com";><child/></root>""" for event, elem in iterparse(StringIO(xml)): print event, elem It produces: end <Element '{http://www.very_long_url.com}child' at 0xb7ddfa58> end <Element '{http://www.very_long_url.com}root' at 0xb7ddfa40> In the current implementation local tags get forcibly concatenated with URIs often resulting in the ugly code on the user's side and performance degradation (at least due to extra concatenations and extra lengthy compare operations in the elements matching code). Internally cElementTree uses EXPAT parser, which is doing namespace processing only optionally, enabled by providing a value for namespace_separator argument. This argument is hard-coded in the cElementTree: self->parser = EXPAT(ParserCreate_MM)(encoding, &memory_handler, "}"); Well, attached is a patch exposing this parameter in the cElementTree.XMLParser() arguments. This parameter is optional and the default behavior should be unchanged. Here's the test code: import cElementTree x = """<root xmlns="http://www.very_long_url.com";><child>text</child></root>""" parser = cElementTree.XMLParser() parser.feed(x) elem = parser.close() print elem parser = cElementTree.XMLParser(namespace_separator="}") parser.feed(x) elem = parser.close() print elem parser = cElementTree.XMLParser(namespace_separator=None) parser.feed(x) elem = parser.close() print elem The resulting output: <Element '{http://www.very_long_url.com}root' at 0xb7e885f0> <Element '{http://www.very_long_url.com}root' at 0xb7e88608> <Element 'root' at 0xb7e88458> ---------- components: Library (Lib) messages: 104671 nosy: dmtr priority: normal severity: normal status: open title: Hardcoded namespace_separator in the cElementTree.XMLParser type: performance versions: Python 2.5, Python 2.6, Python 2.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue8583> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
