xpath()

>>> root = SAMPLE_XML
>>> e = etree.XPathEvaluator(root, None, [extension])
>>> e.evaluate("stringTest('you')")
'Hello you'

>>> e.evaluate(u"stringTest('élan')")
u'Hello \xe9lan'

>>> e.evaluate("stringTest('you','there')")
Traceback (most recent call last):

...

TypeError: stringTest() takes exactly 2 arguments (3 given)

>>> e.evaluate("floatTest(2)")
6.0

>>> e.evaluate("booleanTest(true())")
False

>>> map(tag, e.evaluate("setTest(/body/tag)"))
['tag']

>>> map(tag, e.evaluate("setTest2(/body/*)"))
['tag', 'section']

>>> e.evaluate("argsTest1('a',1.5,true(),/body/tag)")
"a, 1.5, True, ['tag', 'tag', 'tag']"

>>> map(tag, e.evaluate("argsTest2(/body/tag, /body/section)"))
['tag', 'section', 'tag', 'tag']

>>> e.evaluate("resultTypesTest()")
Traceback (most recent call last):

...

XPathResultError: This is not a node: x

>>> try:
...     e.evaluate("resultTypesTest2()")
... except etree.XPathResultError:
...     print "Got error"
Got error