[issue25869] Faster ElementTree deepcopying

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Updated patch correctly handles rare cases when different elements share the same attrib dict and when the same Element is occurred on different places in ElementTree (that is no longer a tree, but a directed graph).

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Added file: http://bugs.python.org/file41317/etree_deepcopy2.patch

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<http://bugs.python.org/issue25869>
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