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# mode: run
# tag: pickle
import cython
import sys
if sys.version_info[0] < 3:
__doc__ = """
>>> import cPickle
>>> a = A(5); a
A(5)
>>> cPickle.loads(cPickle.dumps(a))
A(5)
>>> b = B(0, 1); b
B(x=0, y=1)
>>> cPickle.loads(cPickle.dumps(b))
B(x=0, y=1)
"""
cdef class A:
"""
>>> a = A(3); a
A(3)
>>> import pickle
>>> pickle.loads(pickle.dumps(a))
A(3)
"""
cdef int value
def __init__(self, value):
self.value = value
def __repr__(self):
return "A(%s)" % self.value
def __reduce__(self):
return A, (self.value,)
cdef class B:
"""
>>> b = B(x=37, y=389); b
B(x=37, y=389)
>>> import pickle
>>> pickle.loads(pickle.dumps(b))
B(x=37, y=389)
"""
cdef int x, y
def __cinit__(self):
self.x = self.y = -1
def __init__(self, x=0, y=0):
self.x = x
self.y = y
def __repr__(self):
return "%s(x=%s, y=%s)" % (self.__class__.__name__, self.x, self.y)
def __reduce__(self):
return makeObj, (type(self), {'x': self.x, 'y': self.y})
def makeObj(obj_type, kwds):
return obj_type(**kwds)
cdef class C(B):
"""
>>> import pickle
>>> pickle.loads(pickle.dumps(C(x=37, y=389)))
C(x=37, y=389)
"""
pass
@cython.auto_pickle(True) # Not needed, just to test the directive.
cdef class DefaultReduce(object):
"""
>>> a = DefaultReduce(11, 'abc'); a
DefaultReduce(i=11, s='abc')
>>> import pickle
>>> pickle.loads(pickle.dumps(a))
DefaultReduce(i=11, s='abc')
>>> pickle.loads(pickle.dumps(DefaultReduce(i=11, s=None)))
DefaultReduce(i=11, s=None)
"""
cdef readonly int i
cdef readonly str s
def __init__(self, i=0, s=None):
self.i = i
self.s = s
def __repr__(self):
return "DefaultReduce(i=%s, s=%r)" % (self.i, self.s)
cdef class DefaultReduceSubclass(DefaultReduce):
"""
>>> a = DefaultReduceSubclass(i=11, s='abc', x=1.5); a
DefaultReduceSubclass(i=11, s='abc', x=1.5)
>>> import pickle
>>> pickle.loads(pickle.dumps(a))
DefaultReduceSubclass(i=11, s='abc', x=1.5)
"""
cdef double x
def __init__(self, **kwargs):
self.x = kwargs.pop('x', 0)
super(DefaultReduceSubclass, self).__init__(**kwargs)
def __repr__(self):
return "DefaultReduceSubclass(i=%s, s=%r, x=%s)" % (self.i, self.s, self.x)
cdef class result(DefaultReduceSubclass):
"""
>>> a = result(i=11, s='abc', x=1.5); a
result(i=11, s='abc', x=1.5)
>>> import pickle
>>> pickle.loads(pickle.dumps(a))
result(i=11, s='abc', x=1.5)
"""
def __repr__(self):
return "result(i=%s, s=%r, x=%s)" % (self.i, self.s, self.x)
class DefaultReducePySubclass(DefaultReduce):
"""
>>> a = DefaultReducePySubclass(i=11, s='abc', x=1.5); a
DefaultReducePySubclass(i=11, s='abc', x=1.5)
>>> import pickle
>>> pickle.loads(pickle.dumps(a))
DefaultReducePySubclass(i=11, s='abc', x=1.5)
>>> a.self_reference = a
>>> a2 = pickle.loads(pickle.dumps(a))
>>> a2.self_reference is a2
True
"""
def __init__(self, **kwargs):
self.x = kwargs.pop('x', 0)
super(DefaultReducePySubclass, self).__init__(**kwargs)
def __repr__(self):
return "DefaultReducePySubclass(i=%s, s=%r, x=%s)" % (self.i, self.s, self.x)
cdef class NoReduceDueToIntPtr(object):
"""
>>> import pickle
>>> pickle.dumps(NoReduceDueToIntPtr())
Traceback (most recent call last):
...
TypeError: self.int_ptr cannot be converted to a Python object for pickling
"""
cdef int* int_ptr
cdef class NoReduceDueToNontrivialCInit(object):
"""
>>> import pickle
>>> pickle.dumps(NoReduceDueToNontrivialCInit(None))
Traceback (most recent call last):
...
TypeError: no default __reduce__ due to non-trivial __cinit__
"""
def __cinit__(self, arg):
pass
cdef class NoMembers(object):
"""
>>> import pickle
>>> pickle.loads(pickle.dumps(NoMembers()))
NoMembers()
"""
def __repr__(self):
return "NoMembers()"
cdef class NoPyMembers(object):
"""
>>> import pickle
>>> pickle.loads(pickle.dumps(NoPyMembers(2, 1.75)))
NoPyMembers(ii=[2, 4, 8], x=1.75)
"""
cdef int[3] ii
cdef double x
def __init__(self, i, x):
self.ii[0] = i
self.ii[1] = i * i
self.ii[2] = i * i * i
self.x = x
def __repr__(self):
return "%s(ii=%s, x=%s)" % (type(self).__name__, self.ii, self.x)
def __eq__(self, other):
return (
isinstance(other, NoPyMembers) and
(<NoPyMembers> other).ii[0] == self.ii[0] and
(<NoPyMembers> other).ii[1] == self.ii[1] and
(<NoPyMembers> other).ii[2] == self.ii[2] and
(<NoPyMembers> other).x == self.x
)
class NoPyMembersPySubclass(NoPyMembers):
"""
>>> import pickle
>>> pickle.loads(pickle.dumps(NoPyMembersPySubclass(2, 1.75, 'xyz')))
NoPyMembersPySubclass(ii=[2, 4, 8], x=1.75, s='xyz')
"""
def __init__(self, i, x, s):
super(NoPyMembersPySubclass, self).__init__(i, x)
self.s = s
def __repr__(self):
return (super(NoPyMembersPySubclass, self).__repr__()
[:-1] + ', s=%r)' % self.s)
cdef struct MyStruct:
int i
double x
cdef class StructMemberDefault(object):
"""
>>> import pickle
>>> s = StructMemberDefault(1, 1.5); s
StructMemberDefault(i=1, x=1.5)
>>> pickle.dumps(s) # doctest: +ELLIPSIS
Traceback (most recent call last):
TypeError: ...my_struct...
"""
cdef MyStruct my_struct
def __init__(self, i, x):
self.my_struct.i = i
self.my_struct.x = x
def __repr__(self):
return "%s(i=%s, x=%s)" % (
type(self).__name__, self.my_struct.i, self.my_struct.x)
@cython.auto_pickle(True) # Forced due to the (inherited) struct attribute.
cdef class StructMemberForcedPickle(StructMemberDefault):
"""
>>> import pickle
>>> s = StructMemberForcedPickle(1, 1.5); s
StructMemberForcedPickle(i=1, x=1.5)
>>> pickle.loads(pickle.dumps(s))
StructMemberForcedPickle(i=1, x=1.5)
"""
cdef _unset = object()
# Test cyclic references.
cdef class Wrapper(object):
"""
>>> import pickle
>>> w = Wrapper(); w
Wrapper(...)
>>> w2 = pickle.loads(pickle.dumps(w)); w2
Wrapper(...)
>>> w2.ref is w2
True
>>> pickle.loads(pickle.dumps(Wrapper(DefaultReduce(1, 'xyz'))))
Wrapper(DefaultReduce(i=1, s='xyz'))
>>> L = [None]
>>> L[0] = L
>>> w = Wrapper(L)
>>> pickle.loads(pickle.dumps(Wrapper(L)))
Wrapper([[...]])
>>> L[0] = w # Don't print this one out...
>>> w2 = pickle.loads(pickle.dumps(w))
>>> w2.ref[0] is w2
True
"""
cdef public object ref
def __init__(self, ref=_unset):
if ref is _unset:
self.ref = self
else:
self.ref = ref
def __repr__(self):
if self.ref is self:
return "Wrapper(...)"
else:
return "Wrapper(%r)" % self.ref
# Non-regression test for pickling bound and unbound methods of non-extension
# classes
if sys.version_info[:2] >= (3, 5):
# builtin methods not picklable for python <= 3.4
class MyClass(object):
"""
>>> import pickle
>>> pickle.loads(pickle.dumps(MyClass.my_method)) is MyClass.my_method
True
>>> bound_method = pickle.loads(pickle.dumps(MyClass().my_method))
>>> bound_method(1)
1
"""
def my_method(self, x):
return x
# Pickled with Cython 0.29.28 (using MD5 for the checksum).
OLD_MD5_PICKLE = b'''\
creduce_pickle\n__pyx_unpickle_NoPyMembers\nq\x00\
(creduce_pickle\nNoPyMembers\nq\x01J\xf2K_\n(]q\x02\
(K\x0bKyM3\x05eG?\xf8\x00\x00\x00\x00\x00\x00tq\x03tq\x04Rq\x05.\
'''
try:
from hashlib import md5
except ImportError:
pass
else:
def unpickle_old_0_29_28():
"""
>>> import pickle
>>> b = pickle.loads(OLD_MD5_PICKLE)
>>> b == NoPyMembers(i=11, x=1.5) or b
True
"""
|
