cPickle.c, load_build(): Taught cPickle how to pick apart
the optional proto 2 slot state.
pickle.py, load_build(): CAUTION: Noted that cPickle's
load_build and pickle's load_build really don't do the same
things with the state, and didn't before this patch either.
cPickle never tries to do .update(), and has no backoff if
instance.__dict__ can't be retrieved. There are no tests
that can tell the difference, and part of what cPickle's
load_build() did looked accidental to me, so I don't know
what the true intent is here.
pickletester.py, test_pickle.py: Got rid of the hack for
exempting cPickle from running some of the proto 2 tests.
dictobject.c, PyDict_Next(): documented intended use.
diff --git a/Lib/pickle.py b/Lib/pickle.py
index 74748f8..c62bddc 100644
--- a/Lib/pickle.py
+++ b/Lib/pickle.py
@@ -1249,6 +1249,10 @@
# the instance variables. This is a semantic
# difference when unpickling in restricted
# vs. unrestricted modes.
+ # Note, however, that cPickle has never tried to do the
+ # .update() business, and always uses
+ # PyObject_SetItem(inst.__dict__, key, value) in a
+ # loop over state.items().
for k, v in state.items():
setattr(inst, k, v)
if slotstate: