Eli Bendersky added the comment:
P = import_fresh_module('xml.etree.ElementTree', blocked=['_elementtree'])
tb = P.TreeBuilder(element_factory=lambda a, b: [a, b])
print(pickle.dumps(tb))
Gives: _pickle.PicklingError: Can't pickle <class 'function'>: attribute lookup
builtins.function failed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16076>
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