Andrey Skvortsov schrieb am 08.08.2018 um 17:49:

copy/deepcopy copies all xml content, but information about added methods is lost.

Here is small example: [------------ subclass.py-----------------] from __future__ import print_function from lxml import etree import copy

class DefaultElementClass(etree.ElementBase): def getLocalTag(self): return etree.QName(self.tag).localname

def printInformation(x): print(x, x.__class__, "getLocalTag" in dir(x))

a = DefaultElementClass() printInformation(a)

# printInformation(copy.copy(a)) printInformation(copy.deepcopy(a)) [-----------------------------------------]

Output: <Element DefaultElementClass at 0x7f13d15416d8> <class '__main__.DefaultElementClass'> True <Element DefaultElementClass at 0x7f13d1652d88> <type 'lxml.etree._Element'> False <Element DefaultElementClass at 0x7f13d1652d88> <type 'lxml.etree._Element'> False

Expected output: <Element DefaultElementClass at 0x7f13d15416d8> <class '__main__.DefaultElementClass'> True <Element DefaultElementClass at 0x7f13d15416d8> <class '__main__.DefaultElementClass'> True <Element DefaultElementClass at 0x7f13d15416d8> <class '__main__.DefaultElementClass'> True

How create copy of the element and keep all methods from subclass?

You need to register the classes for the specific elements. https://lxml.de/element_classes.html Stefan