Martin Panter added the comment:
As far as I can tell this was already working, even in 3.4.0a1 (the first
pre-release of 3.4):
>>> tree.write('/dev/stdout', xml_declaration=True)
<?xml version='1.0' encoding='us-ascii'?>
<rss version="2.0" />
But it is not working in Python 2:
>>> tree.write('/dev/stdout', xml_declaration=True)
<rss version="2.0" />
Looking at the history, I am confused because a 3.2.3 revision (df8609f1854d)
comes up in the history of 2.7’s /Doc/library/xml.etree.elementtree.rst.
Perhaps it is just that the documentation has inherited some wording from
Python 3. Possibly also relevant: revision 57e631f
<https://bitbucket.org/mirror/cpython/commits/57e631f> and Issue 8047.
----------
nosy: +martin.panter
stage: -> needs patch
versions: +Python 2.7 -Python 3.4
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