improper use of __setitem__ in ElementTree for Python 3.1

@aroberge

BPO	6565
Nosy	@aroberge, @florentx
Superseder	bpo-6472: Update ElementTree with upstream changes
Files	test.py: Test file showing the behaviour described.

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2010-03-11.14:57:27.228>
created_at = <Date 2009-07-24.19:46:51.533>
labels = ['expert-XML', 'type-bug']
title = 'improper use of __setitem__ in ElementTree for Python 3.1'
updated_at = <Date 2010-03-11.14:57:27.226>
user = 'https://github.com/aroberge'

bugs.python.org fields:

activity = <Date 2010-03-11.14:57:27.226>
actor = 'flox'
assignee = 'effbot'
closed = True
closed_date = <Date 2010-03-11.14:57:27.228>
closer = 'flox'
components = ['XML']
creation = <Date 2009-07-24.19:46:51.533>
creator = 'aroberge'
dependencies = []
files = ['14560']
hgrepos = []
issue_num = 6565
keywords = []
message_count = 3.0
messages = ['90891', '99398', '100863']
nosy_count = 3.0
nosy_names = ['effbot', 'aroberge', 'flox']
pr_nums = []
priority = 'high'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = '6472'
type = 'behavior'
url = 'https://bugs.python.org/issue6565'
versions = ['Python 3.1', 'Python 3.2']

I have a function to replace the content of an ElementTree Element by
that of another one which works using Python 2 but not with Python 3.
I get an assertion error.

It was suggested on the Python list that the problem is that in Python 3
slice assignments are done with __setitem__ rather than __setslice__ but
ElementTree has not been adapted to that -- hence the title given to
this bug.

The function that I use to demonstrate this (with a workaround solution)
is as follows:

def replace_element(elem, replacement):
    '''replace the content of an ElementTree Element by that of
another
       one.
    '''
    elem.clear()
    elem.text = replacement.text
    elem.tail = replacement.tail
    elem.tag = replacement.tag
    elem.attrib = replacement.attrib
    try:
        elem[:] = replacement[:]  # works with Python 2.5 but not 3.1
    except AssertionError:
        del elem[:]
        for child in replacement:
            elem.append(child)

I have included a small test file which demonstrate the behaviour.

Should be fixed with the upstream version, proposed on bpo-6472.

Fixed in 2.7 with bpo-6472. It should be ported to 3.x later.

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improper use of setitem in ElementTree for Python 3.1 #50814

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improper use of __setitem__ in ElementTree for Python 3.1 #50814

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aroberge commented on Jul 24, 2009

florentx commented on Feb 16, 2010

florentx commented on Mar 11, 2010

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improper use of setitem in ElementTree for Python 3.1 #50814