TypeError: can't pickle StringElement objects

[scoder]

Environment info:
{{{
Ubuntu 9.10
lxml.etree: (2, 2, 4, 0)
libxml used: (2, 7, 5)
libxml compiled: (2, 7, 5)
libxslt used: (1, 1, 24)
libxslt compiled: (1, 1, 24)
}}}

How to reproduce:
{{{
import pickle
from lxml import objectify
pickle.dumps(objectify.fromstring('<a><b><c/></b></a>').b) # Works.
pickle.dumps(objectify.fromstring('<a><b>1234</b></a>').b) # Fails.
pickle.dumps(objectify.fromstring('<a><b>abcd</b></a>').b) # Fails.
pickle.dumps(objectify.fromstring('<a><b/></a>').b) # Fails.
}}}

Example traceback:
{{{
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.6/pickle.py", line 1366, in dumps
    Pickler(file, protocol).dump(obj)
  File "/usr/lib/python2.6/pickle.py", line 224, in dump
    self.save(obj)
  File "/usr/lib/python2.6/pickle.py", line 306, in save
    rv = reduce(self.proto)
  File "/usr/lib/python2.6/copy_reg.py", line 70, in _reduce_ex
    raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle StringElement objects
}}}

[Holger Joukl (jholg)]

Fixed on the trunk:

Committed revision 71085.

Changes:

$ svn diff -rCOMMITTED
Index: src/lxml/tests/test_objectify.py
===================================================================
--- src/lxml/tests/test_objectify.py (revision 71046)
+++ src/lxml/tests/test_objectify.py (working copy)
@@ -2328,6 +2328,43 @@
             etree.tostring(new_tree),
             etree.tostring(tree))

+ def test_pickle_intelement(self):
+ self._test_pickle('<x>42</x>')
+ self._test_pickle(objectify.DataElement(42))
+
+ def test_pickle_floattelement(self):
+ self._test_pickle('<x>42.0</x>')
+ self._test_pickle(objectify.DataElement(42.0))
+
+ def test_pickle_strelement(self):
+ self._test_pickle('<x>Pickle me!</x>')
+ self._test_pickle(objectify.DataElement('Pickle me!'))
+
+ def test_pickle_boolelement(self):
+ self._test_pickle('<x>true</x>')
+ self._test_pickle('<x>false</x>')
+ self._test_pickle(objectify.DataElement(True))
+ self._test_pickle(objectify.DataElement(False))
+
+ def test_pickle_noneelement(self):
+ self._test_pickle('''
+<x xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:nil="true"/>''')
+ self._test_pickle(objectify.DataElement(None))
+
+ def _test_pickle(self, stringOrElt):
+ import pickle
+ if isinstance(stringOrElt, (etree._Element, etree._ElementTree)):
+ elt = stringOrElt
+ else:
+ elt = self.XML(stringOrElt)
+ out = BytesIO()
+ pickle.dump(elt, out)
+
+ new_elt = pickle.loads(out.getvalue())
+ self.assertEquals(
+ etree.tostring(new_elt),
+ etree.tostring(elt)) ...

[scoder (scoder)]

Fixed in lxml 2.3alpha1.