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xml.etree.ElementTree.Element's append method doesn't support iterator/sequence parameters as it's supposed to, for the version 1.3.0.
Python 2.7.3 (default, Sep 14 2012, 09:52:31) 
[GCC 4.2.1 Compatible Apple Clang 4.0 ((tags/Apple/clang-421.0.60))] on darwin
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>>> import xml.etree.ElementTree as et
>>> et.VERSION
'1.3.0'
>>> root = et.Element('root')
>>> sublist = [et.Element('sub'), et.Element('sub')]
>>> root.append(sublist)
>>> et.tostring(root)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1127, in tostring
 ElementTree(element).write(file, encoding, method=method)
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 818, in write
 self._root, encoding, default_namespace
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 878, in _namespaces
 for elem in iterate():
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 477, in iter
 for e in e.iter(tag):
AttributeError: 'list' object has no attribute 'iter'
>>> root = et.Element('root')
>>> root.append(iter(sublist))
>>> et.tostring(root)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 1127, in tostring
 ElementTree(element).write(file, encoding, method=method)
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 818, in write
 self._root, encoding, default_namespace
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 878, in _namespaces
 for elem in iterate():
 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/xml/etree/ElementTree.py", line 477, in iter
 for e in e.iter(tag):
AttributeError: 'listiterator' object has no attribute 'iter'