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In the example there are two namespaces in one document, but it is impossible to search all elements only in one namespace:
>>> import xml.etree.ElementTree as etree
>>>
>>> s = '<feed xmlns="http://def" xmlns:x="http://x"><a/><x:b/></feed>'
>>>
>>> root = etree.fromstring(s)
>>>
>>> root.findall('*')
[<Element '{http://def}a' at 0xb73961bc>, <Element '{http://x}b' at 0xb7396c34>]
>>>
>>> root.findall('{http://def}*')
[]
>>>
And same try with site package lxml works fine:
>>> import lxml.etree as etree
>>>
>>> s = '<feed xmlns="http://def" xmlns:x="http://x"><a/><x:b/></feed>'
>>>
>>> root = etree.fromstring(s)
>>>
>>> root.findall('*')
[<Element {http://def}a at 0xb70ab11c>, <Element {http://x}b at 0xb70ab144>]
>>>
>>> root.findall('{http://def}*')
[<Element {http://def}a at 0xb70ab11c>]
>>>