Issue #1727780: Support loading pickles of random.Random objects created

on 32-bit systems on 64-bit systems, and vice versa. As a consequence
of the change, Random pickles created by Python 2.6 cannot be loaded
in Python 2.5.
This commit is contained in:
Martin v. Löwis 2007-12-03 19:20:02 +00:00
parent 2ec7415db5
commit 6b449f4f2b
10 changed files with 1944 additions and 10 deletions

View File

@ -80,6 +80,9 @@ Bookkeeping functions:
.. versionadded:: 2.1 .. versionadded:: 2.1
.. versionchanged:: 2.6
State values produced in Python 2.6 cannot be loaded into earlier versions.
.. function:: setstate(state) .. function:: setstate(state)

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@ -83,7 +83,7 @@ class Random(_random.Random):
""" """
VERSION = 2 # used by getstate/setstate VERSION = 3 # used by getstate/setstate
def __init__(self, x=None): def __init__(self, x=None):
"""Initialize an instance. """Initialize an instance.
@ -120,9 +120,20 @@ class Random(_random.Random):
def setstate(self, state): def setstate(self, state):
"""Restore internal state from object returned by getstate().""" """Restore internal state from object returned by getstate()."""
version = state[0] version = state[0]
if version == 2: if version == 3:
version, internalstate, self.gauss_next = state version, internalstate, self.gauss_next = state
super(Random, self).setstate(internalstate) super(Random, self).setstate(internalstate)
elif version == 2:
version, internalstate, self.gauss_next = state
# In version 2, the state was saved as signed ints, which causes
# inconsistencies between 32/64-bit systems. The state is
# really unsigned 32-bit ints, so we convert negative ints from
# version 2 to positive longs for version 3.
try:
internalstate = tuple( long(x) % (2**32) for x in internalstate )
except ValueError, e:
raise TypeError, e
super(Random, self).setstate(internalstate)
else: else:
raise ValueError("state with version %s passed to " raise ValueError("state with version %s passed to "
"Random.setstate() of version %s" % "Random.setstate() of version %s" %

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crandom
Random
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tp2
Ntp3
b.

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crandom
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I624
tp2
Ntp3
b.

633
Lib/test/randv3.pck Normal file
View File

@ -0,0 +1,633 @@
crandom
Random
p0
(tRp1
(I3
(L2147483648L
L994081831L
L2806287265L
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L3476194446L
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L4252889045L
L1921944555L
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L210143935L
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L325158375L
L3450846447L
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L1417044075L
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L2193440343L
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L216416432L
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L624L
tp2
Ntp3
b.

View File

@ -140,6 +140,19 @@ class TestBasicOps(unittest.TestCase):
restoredseq = [newgen.random() for i in xrange(10)] restoredseq = [newgen.random() for i in xrange(10)]
self.assertEqual(origseq, restoredseq) self.assertEqual(origseq, restoredseq)
def test_bug_1727780(self):
# verify that version-2-pickles can be loaded
# fine, whether they are created on 32-bit or 64-bit
# platforms, and that version-3-pickles load fine.
files = [("randv2_32.pck", 780),
("randv2_64.pck", 866),
("randv3.pck", 343)]
for file, value in files:
f = open(test_support.findfile(file),"rb")
r = pickle.load(f)
f.close()
self.assertEqual(r.randrange(1000), value)
class WichmannHill_TestBasicOps(TestBasicOps): class WichmannHill_TestBasicOps(TestBasicOps):
gen = random.WichmannHill() gen = random.WichmannHill()

View File

@ -395,6 +395,7 @@ Marc-Andre Lemburg
Mark Levinson Mark Levinson
William Lewis William Lewis
Robert van Liere Robert van Liere
Shawn Ligocki
Martin Ligr Martin Ligr
Christopher Lindblad Christopher Lindblad
Eric Lindvall Eric Lindvall

View File

@ -308,6 +308,11 @@ Core and builtins
Library Library
------- -------
- Issue #1727780: Support loading pickles of random.Random objects created
on 32-bit systems on 64-bit systems, and vice versa. As a consequence
of the change, Random pickles created by Python 2.6 cannot be loaded
in Python 2.5.
- Issue #1455: The distutils package now supports VS 2005 and VS 2008 for - Issue #1455: The distutils package now supports VS 2005 and VS 2008 for
both the msvccompiler and cygwincompiler. both the msvccompiler and cygwincompiler.

View File

@ -319,12 +319,12 @@ random_getstate(RandomObject *self)
if (state == NULL) if (state == NULL)
return NULL; return NULL;
for (i=0; i<N ; i++) { for (i=0; i<N ; i++) {
element = PyInt_FromLong((long)(self->state[i])); element = PyLong_FromUnsignedLong(self->state[i]);
if (element == NULL) if (element == NULL)
goto Fail; goto Fail;
PyTuple_SET_ITEM(state, i, element); PyTuple_SET_ITEM(state, i, element);
} }
element = PyInt_FromLong((long)(self->index)); element = PyLong_FromLong((long)(self->index));
if (element == NULL) if (element == NULL)
goto Fail; goto Fail;
PyTuple_SET_ITEM(state, i, element); PyTuple_SET_ITEM(state, i, element);
@ -339,7 +339,8 @@ static PyObject *
random_setstate(RandomObject *self, PyObject *state) random_setstate(RandomObject *self, PyObject *state)
{ {
int i; int i;
long element; unsigned long element;
long index;
if (!PyTuple_Check(state)) { if (!PyTuple_Check(state)) {
PyErr_SetString(PyExc_TypeError, PyErr_SetString(PyExc_TypeError,
@ -353,16 +354,16 @@ random_setstate(RandomObject *self, PyObject *state)
} }
for (i=0; i<N ; i++) { for (i=0; i<N ; i++) {
element = PyInt_AsLong(PyTuple_GET_ITEM(state, i)); element = PyLong_AsUnsignedLong(PyTuple_GET_ITEM(state, i));
if (element == -1 && PyErr_Occurred()) if (element == -1 && PyErr_Occurred())
return NULL; return NULL;
self->state[i] = (unsigned long)element; self->state[i] = element & 0xffffffffUL; /* Make sure we get sane state */
} }
element = PyInt_AsLong(PyTuple_GET_ITEM(state, i)); index = PyLong_AsLong(PyTuple_GET_ITEM(state, i));
if (element == -1 && PyErr_Occurred()) if (index == -1 && PyErr_Occurred())
return NULL; return NULL;
self->index = (int)element; self->index = (int)index;
Py_INCREF(Py_None); Py_INCREF(Py_None);
return Py_None; return Py_None;

View File

@ -933,6 +933,7 @@ def add_files(db):
lib.add_file("empty.vbs") lib.add_file("empty.vbs")
lib.glob("*.uue") lib.glob("*.uue")
lib.glob("*.pem") lib.glob("*.pem")
lib.glob("*.pck")
lib.add_file("readme.txt", src="README") lib.add_file("readme.txt", src="README")
if dir=='decimaltestdata': if dir=='decimaltestdata':
lib.glob("*.decTest") lib.glob("*.decTest")