Eli Bendersky added the comment:
Eric, yes the key code in test_xml_etree that handles this is:
def pickleRoundTrip(self, obj, name, dumper, loader):
save_m = sys.modules[name]
try:
sys.modules[name] = dumper
temp = pickle.dumps(obj)
sys.modules[name] = loader
result = pickle.loads(temp)
except pickle.PicklingError as pe:
# pyET must be second, because pyET may be (equal to) ET.
human = dict([(ET, "cET"), (pyET, "pyET")])
raise support.TestFailed("Failed to round-trip %r from %r to %r"
% (obj,
human.get(dumper, dumper),
human.get(loader, loader))) from pe
finally:
sys.modules[name] = save_m
return result
Because pickle does its own import of ElementTree.
The test___all__ problem should be solved by a patch to issue #1674555, but
having a separate mechanism in test.support was discussed. I'll take a look at
your decorator.
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<http://bugs.python.org/issue16817>
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