Both 2.7 and 3.x use sorted() to force an attribute ordering. It does not solve round trip parsing and writing. This is a partial solution, for the case where xml is being emitted and a predictable order is desired.
Nah, probably that's even worse and I should go to bed before I come up with anything more horrible than that. Unless you did something nasty like subclass OrderedDict and hack items to return a special subclass of list that ignores calls to sort(). Subclassing or monkey-patching that is going to be annoying as it's right in the middle of a big method. This looks like the line to blame, in ElementTree._write: items.sort() # lexical order > s = StringIO.StringIO()īah, the serialiser outputs them in canonical order. > root = tree.parse(xmlf, OrderedXMLTreeBuilder()) from xml.etree import ElementTreeĬlass OrderedXMLTreeBuilder(ElementTree.XMLTreeBuilder): Here's a stab at it that replaces the dictionary when parsing with an ordered one ( collections.OrderedDict()). (There are some DOMs that do offer it as a feature, but it's not standard.)Ĭan it be fixed? Maybe. ElementTree uses a dictionary to store attribute values, so it's inherently unordered.Įven DOM doesn't guarantee you attribute ordering, and DOM exposes a lot more detail of the XML infoset than ElementTree does. Then in your code: tree = ET.parse(pathToFile, OrderedXMLTreeBuilder()) Write(ET._escape_cdata(elem.tail, encoding))Ĭlass OrderedXMLTreeBuilder(ET.XMLTreeBuilder):Īttrib)] = self._fixtext(attrib_in)
_serialize_xml(write, e, encoding, qnames, None) I managed to get this monkey patched it's dirty and I'd suggest using another module that better handles this scenario but when that isn't a possibility: # =ĭef _serialize_xml(write, elem, encoding, qnames, namespaces): With help from answer and these two ( setting attribute order, overriding module methods)
How can I get the order of an element attribute list using Python xml.sax?.
#MACVECTOR REORDER ACCORDING TO TREE CODE#
This is my first time taking ElementTree for a spin (and only my fifth or sixth python project) so maybe I'm just doing it wrong.Ībstracted for simplicity the code looks like this: tree = (inputfile) But even thought the data fields are static the xml isn't, so I've written a script for fixing the paths, but with the attribute rearrangement diffs between the local and master versions are harder to read than necessary. This isn't a disaster because the combined source- and build-control tool we're using allows us to shadow certain files with local copies. These paths are hardcoded into the existing xml and there are no facilities for setting or varying them based on environment variables, and in our local installation they are necessarily in a different place. Among the many things setup that way are the paths to various static data files. I'm working with and on a particle physics tool that has a complex, but oddly limited configuration system based on xml files. And it works, more or less.īut it reorders the attributes of various tags, and I'd like it to not do that.ĭoes anyone know a switch I can throw to make it keep them in specified order? Context for this I've written a fairly simple filter in python using ElementTree to munge the contexts of some xml files.
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