def delslice(self, w_obj, w_start, w_stop):
w_descr = self.lookup(w_obj, '__delslice__')
if w_descr is not None:
w_start, w_stop = old_slice_range(self, w_obj, w_start, w_stop)
self.get_and_call_function(w_descr, w_obj, w_start, w_stop)
else:
ObjSpace.delslice(self, w_obj, w_start, w_stop)
def __init__(self, config=None):
self._seen_extras = []
ObjSpace.__init__(self, config=config)
self.setup()
# Be sure to annotate W_SliceObject constructor.
# In Python2, this is triggered by W_InstanceObject.__getslice__.
def build_slice():
self.newslice(self.w_None, self.w_None, self.w_None)
def attach_list_strategy():
# this is needed for modules which interacts directly with
# std.listobject.W_ListObject, e.g. after an isinstance check. For
# example, _hpy_universal. We need to attach a couple of attributes
# so that the annotator annotates them with the correct types
from pypy.objspace.std.listobject import W_ListObject, ObjectListStrategy
space = self
w_obj = w_some_obj()
if isinstance(w_obj, W_ListObject):
w_obj.space = space
w_obj.strategy = ObjectListStrategy(space)
list_w = [w_some_obj(), w_some_obj()]
w_obj.lstorage = w_obj.strategy.erase(list_w)
self._seen_extras.append(build_slice)
self._seen_extras.append(attach_list_strategy)
def __init__(self, config=None):
self._seen_extras = []
ObjSpace.__init__(self, config=config)
self.setup()
# Be sure to annotate W_SliceObject constructor.
# In Python2, this is triggered by W_InstanceObject.__getslice__.
def build_slice():
self.newslice(self.w_None, self.w_None, self.w_None)
self._seen_extras.append(build_slice)
def exception_match(self, w_exc_type, w_check_class):
try:
check_class = self.unwrap(w_check_class)
except UnwrapException:
raise Exception, "non-constant except guard"
if not isinstance(check_class, tuple):
# the simple case
return ObjSpace.exception_match(self, w_exc_type, w_check_class)
# checking a tuple of classes
for w_klass in self.unpacktuple(w_check_class):
if ObjSpace.exception_match(self, w_exc_type, w_klass):
return True
return False
def exception_match(self, w_exc_type, w_check_class):
try:
check_class = self.unwrap(w_check_class)
except UnwrapException:
raise Exception, "non-constant except guard"
if not isinstance(check_class, tuple):
# the simple case
return ObjSpace.exception_match(self, w_exc_type, w_check_class)
# checking a tuple of classes
for w_klass in self.viewiterable(w_check_class):
if ObjSpace.exception_match(self, w_exc_type, w_klass):
return True
return False
def createexecutioncontext(self):
# add space specific fields to execution context
# note that this method must not call space methods that might need an
# execution context themselves (e.g. nearly all space methods)
ec = ObjSpace.createexecutioncontext(self)
ec._py_repr = None
return ec
def call_method(self, w_obj, methname, *arg_w):
if self.config.objspace.opcodes.CALL_METHOD:
from pypy.objspace.std.callmethod import call_method_opt
return call_method_opt(self, w_obj, methname, *arg_w)
else:
return ObjSpace.call_method(self, w_obj, methname, *arg_w)
def createexecutioncontext(self):
# add space specific fields to execution context
# note that this method must not call space methods that might need an
# execution context themselves (e.g. nearly all space methods)
ec = ObjSpace.createexecutioncontext(self)
ec._py_repr = None
return ec
def listview(self, w_obj, expected_length=-1):
t = self.listview_no_unpack(w_obj)
if t is None:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return t
def listview(self, w_obj, expected_length=-1):
t = self.listview_no_unpack(w_obj)
if t is None:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return t
def exception_issubclass_w(space, w_cls1, w_cls2):
if isinstance(w_cls1, W_ClassObject):
if isinstance(w_cls2, W_ClassObject):
return w_cls1.is_subclass_of(w_cls2)
return False
if isinstance(w_cls2, W_ClassObject):
return False
return BaseObjSpace.exception_issubclass_w(space, w_cls1, w_cls2)
def fixedview(self, w_obj, expected_length=-1, unroll=False):
""" Fast paths
"""
if isinstance(w_obj, W_TupleObject):
t = w_obj.wrappeditems
elif isinstance(w_obj, W_ListObject):
t = w_obj.wrappeditems[:]
else:
if unroll:
return make_sure_not_resized(ObjSpace.unpackiterable_unroll(
self, w_obj, expected_length)[:])
else:
return make_sure_not_resized(ObjSpace.unpackiterable(
self, w_obj, expected_length)[:])
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return make_sure_not_resized(t)
def exception_issubclass_w(space, w_cls1, w_cls2):
if isinstance(w_cls1, W_ClassObject):
if isinstance(w_cls2, W_ClassObject):
return w_cls1.is_subclass_of(w_cls2)
return False
if isinstance(w_cls2, W_ClassObject):
return False
return BaseObjSpace.exception_issubclass_w(space, w_cls1, w_cls2)
def fixedview(self, w_obj, expected_length=-1, unroll=False):
""" Fast paths
"""
if isinstance(w_obj, W_AbstractTupleObject) and self._uses_tuple_iter(w_obj):
t = w_obj.tolist()
elif type(w_obj) is W_ListObject:
if unroll:
t = w_obj.getitems_unroll()
else:
t = w_obj.getitems_fixedsize()
else:
if unroll:
return make_sure_not_resized(ObjSpace.unpackiterable_unroll(self, w_obj, expected_length))
else:
return make_sure_not_resized(ObjSpace.unpackiterable(self, w_obj, expected_length)[:])
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return make_sure_not_resized(t)
def finditem(self, w_obj, w_key):
""" Perform a getitem on w_obj with w_key (any object). Returns found
element or None on element not found.
performance shortcut to avoid creating the OperationError(KeyError).
"""
if isinstance(w_obj, W_DictMultiObject) and not w_obj.user_overridden_class:
return w_obj.getitem(w_key)
return ObjSpace.finditem(self, w_obj, w_key)
def unpackiterable(self, w_obj, expected_length=-1):
if isinstance(w_obj, W_AbstractTupleObject) and self._uses_tuple_iter(w_obj):
t = w_obj.getitems_copy()
elif type(w_obj) is W_ListObject:
t = w_obj.getitems_copy()
else:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return t
def finditem_str(self, w_obj, key):
""" Perform a getitem on w_obj with key (string). Returns found
element or None on element not found.
performance shortcut to avoid creating the OperationError(KeyError)
and allocating W_BytesObject
"""
if isinstance(w_obj, W_DictMultiObject) and not w_obj.user_overridden_class:
return w_obj.getitem_str(key)
return ObjSpace.finditem_str(self, w_obj, key)
def unpackiterable(self, w_obj, expected_length=-1):
if isinstance(w_obj, W_TupleObject):
t = w_obj.wrappeditems[:]
elif isinstance(w_obj, W_ListObject):
t = w_obj.wrappeditems[:]
else:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise UnpackValueError("Expected length %d, got %d" % (expected_length, len(t)))
return t
def exception_issubclass_w(space, w_cls1, w_cls2):
cls1 = space.interpclass_w(w_cls1)
cls2 = space.interpclass_w(w_cls2)
if isinstance(cls1, W_ClassObject):
if isinstance(cls2, W_ClassObject):
return cls1.is_subclass_of(cls2)
return False
if isinstance(cls2, W_ClassObject):
return False
return BaseObjSpace.exception_issubclass_w(space, w_cls1, w_cls2)
def unpackiterable(self, w_obj, expected_length=-1):
if isinstance(w_obj, W_AbstractTupleObject) and self._uses_tuple_iter(w_obj):
t = w_obj.getitems_copy()
elif type(w_obj) is W_ListObject:
t = w_obj.getitems_copy()
else:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return t
def finditem(self, w_obj, w_key):
""" Perform a getitem on w_obj with w_key (any object). Returns found
element or None on element not found.
performance shortcut to avoid creating the OperationError(KeyError).
"""
if (isinstance(w_obj, W_DictMultiObject)
and not w_obj.user_overridden_class):
return w_obj.getitem(w_key)
return ObjSpace.finditem(self, w_obj, w_key)
def listview(self, w_obj, expected_length=-1):
if isinstance(w_obj, W_ListObject):
t = w_obj.wrappeditems
elif isinstance(w_obj, W_TupleObject):
t = w_obj.wrappeditems[:]
else:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return t
def exception_match(self, w_exc_type, w_check_class):
try:
check_class = self.unwrap(w_check_class)
except UnwrapException:
raise Exception, "non-constant except guard"
if check_class in (NotImplementedError, AssertionError):
raise error.FlowingError("Catching %s is not valid in RPython" % check_class.__name__)
if not isinstance(check_class, tuple):
# the simple case
return ObjSpace.exception_match(self, w_exc_type, w_check_class)
# special case for StackOverflow (see rlib/rstackovf.py)
if check_class == rstackovf.StackOverflow:
w_real_class = self.wrap(rstackovf._StackOverflow)
return ObjSpace.exception_match(self, w_exc_type, w_real_class)
# checking a tuple of classes
for w_klass in self.fixedview(w_check_class):
if self.exception_match(w_exc_type, w_klass):
return True
return False
def exception_issubclass_w(space, w_cls1, w_cls2):
cls1 = space.interpclass_w(w_cls1)
cls2 = space.interpclass_w(w_cls2)
if isinstance(cls1, W_ClassObject):
if isinstance(cls2, W_ClassObject):
return cls1.is_subclass_of(cls2)
return False
if isinstance(cls2, W_ClassObject):
return False
return BaseObjSpace.exception_issubclass_w(space, w_cls1, w_cls2)
def unpackiterable(self, w_obj, expected_length=-1):
if isinstance(w_obj, W_TupleObject):
t = w_obj.wrappeditems[:]
elif isinstance(w_obj, W_ListObject):
t = w_obj.wrappeditems[:]
else:
return ObjSpace.unpackiterable(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise UnpackValueError("Expected length %d, got %d" %
(expected_length, len(t)))
return t
def exception_match(self, w_exc_type, w_check_class):
try:
check_class = self.unwrap(w_check_class)
except UnwrapException:
raise Exception, "non-constant except guard"
if check_class in (NotImplementedError, AssertionError):
raise error.FlowingError("Catching %s is not valid in RPython" %
check_class.__name__)
if not isinstance(check_class, tuple):
# the simple case
return ObjSpace.exception_match(self, w_exc_type, w_check_class)
# special case for StackOverflow (see rlib/rstackovf.py)
if check_class == rstackovf.StackOverflow:
w_real_class = self.wrap(rstackovf._StackOverflow)
return ObjSpace.exception_match(self, w_exc_type, w_real_class)
# checking a tuple of classes
for w_klass in self.fixedview(w_check_class):
if self.exception_match(w_exc_type, w_klass):
return True
return False
def fixedview(self, w_obj, expected_length=-1, unroll=False):
""" Fast paths
"""
if isinstance(w_obj, W_AbstractTupleObject) and self._uses_tuple_iter(w_obj):
t = w_obj.tolist()
elif type(w_obj) is W_ListObject:
if unroll:
t = w_obj.getitems_unroll()
else:
t = w_obj.getitems_fixedsize()
else:
if unroll:
return make_sure_not_resized(ObjSpace.unpackiterable_unroll(
self, w_obj, expected_length))
else:
return make_sure_not_resized(ObjSpace.unpackiterable(
self, w_obj, expected_length)[:])
if expected_length != -1 and len(t) != expected_length:
raise self._wrap_expected_length(expected_length, len(t))
return make_sure_not_resized(t)
def finditem_str(self, w_obj, key):
""" Perform a getitem on w_obj with key (string). Returns found
element or None on element not found.
performance shortcut to avoid creating the OperationError(KeyError)
and allocating W_BytesObject
"""
if (isinstance(w_obj, W_DictMultiObject)
and not w_obj.user_overridden_class):
return w_obj.getitem_str(key)
return ObjSpace.finditem_str(self, w_obj, key)
def getindex_w(self, w_obj, w_exception, objdescr=None):
# Performance shortcut for the common case of w_obj being an int.
# If withsmallint is disabled, we check for W_IntObject.
# If withsmallint is enabled, we only check for W_SmallIntObject - it's
# probably not useful to have a shortcut for W_IntObject at all then.
if self.config.objspace.std.withsmallint:
if type(w_obj) is W_SmallIntObject:
return w_obj.intval
else:
if type(w_obj) is W_IntObject:
return w_obj.intval
return ObjSpace.getindex_w(self, w_obj, w_exception, objdescr)
def fixedview(self, w_obj, expected_length=-1):
""" Fast paths
"""
if isinstance(w_obj, W_TupleObject):
t = w_obj.wrappeditems
elif isinstance(w_obj, W_ListObject):
t = w_obj.wrappeditems[:]
else:
return ObjSpace.fixedview(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise UnpackValueError("Expected length %d, got %d" % (expected_length, len(t)))
return t
def fixedview(self, w_obj, expected_length=-1):
""" Fast paths
"""
if isinstance(w_obj, W_TupleObject):
t = w_obj.wrappeditems
elif isinstance(w_obj, W_ListObject):
t = w_obj.wrappeditems[:]
else:
return ObjSpace.fixedview(self, w_obj, expected_length)
if expected_length != -1 and len(t) != expected_length:
raise UnpackValueError("Expected length %d, got %d" %
(expected_length, len(t)))
return t
def createexecutioncontext(self):
# add space specific fields to execution context
ec = ObjSpace.createexecutioncontext(self)
ec._py_repr = self.newdict()
if self.config.objspace.std.withmethodcache:
SIZE = 1 << self.config.objspace.std.methodcachesizeexp
ec.method_cache_versions = [None] * SIZE
ec.method_cache_names = [None] * SIZE
ec.method_cache_lookup_where = [(None, None)] * SIZE
if self.config.objspace.std.withmethodcachecounter:
ec.method_cache_hits = {}
ec.method_cache_misses = {}
return ec
def createexecutioncontext(self):
# add space specific fields to execution context
# note that this method must not call space methods that might need an
# execution context themselves (e.g. nearly all space methods)
ec = ObjSpace.createexecutioncontext(self)
ec._py_repr = None
if self.config.objspace.std.withmethodcache:
SIZE = 1 << self.config.objspace.std.methodcachesizeexp
ec.method_cache_versions = [None] * SIZE
ec.method_cache_names = [None] * SIZE
ec.method_cache_lookup_where = [(None, None)] * SIZE
if self.config.objspace.std.withmethodcachecounter:
ec.method_cache_hits = {}
ec.method_cache_misses = {}
return ec
def unpackiterable(self, w_iterable, expected_length=None):
if not isinstance(w_iterable, Variable):
l = list(self.unwrap(w_iterable))
if expected_length is not None and len(l) != expected_length:
raise ValueError
return [self.wrap(x) for x in l]
if isinstance(w_iterable, Variable) and expected_length is None:
raise UnwrapException, ("cannot unpack a Variable iterable" "without knowing its length")
elif expected_length is not None:
w_len = self.len(w_iterable)
w_correct = self.eq(w_len, self.wrap(expected_length))
if not self.is_true(w_correct):
e = OperationError(self.w_ValueError, self.w_None)
e.normalize_exception(self)
raise e
return [self.do_operation("getitem", w_iterable, self.wrap(i)) for i in range(expected_length)]
return ObjSpace.unpackiterable(self, w_iterable, expected_length)
def unpackiterable(self, w_iterable, expected_length=None):
if not isinstance(w_iterable, Variable):
l = list(self.unwrap(w_iterable))
if expected_length is not None and len(l) != expected_length:
raise ValueError
return [self.wrap(x) for x in l]
if isinstance(w_iterable, Variable) and expected_length is None:
raise UnwrapException, ("cannot unpack a Variable iterable"
"without knowing its length")
elif expected_length is not None:
w_len = self.len(w_iterable)
w_correct = self.eq(w_len, self.wrap(expected_length))
if not self.is_true(w_correct):
e = OperationError(self.w_ValueError, self.w_None)
e.normalize_exception(self)
raise e
return [self.do_operation('getitem', w_iterable, self.wrap(i))
for i in range(expected_length)]
return ObjSpace.unpackiterable(self, w_iterable, expected_length)
def exception_issubclass_w(space, w_cls1, w_cls2):
if (space.type(w_cls1) is space.w_type
and space.type(w_cls2) is space.w_type):
return BaseObjSpace.exception_issubclass_w(space, w_cls1, w_cls2)
#
if (not exception_is_valid_class_w(space, w_cls2)
or not exception_is_valid_class_w(space, w_cls1)):
return False
#
# The rest is the rare slow case. Use the general logic of issubclass()
# (issue #3149). CPython 3.x doesn't do that (but there is a
# many-years issue report: https://bugs.python.org/issue12029), and
# there are probably tests, so we won't call abstract_issubclass_w()
# either in PyPy3.
try:
return abstract_issubclass_w(space, w_cls1, w_cls2, True)
except OperationError as e:
if e. async (space):
raise
return False
def unpackiterable(self, w_iterable, expected_length=None):
if not isinstance(w_iterable, Variable):
l = list(self.unwrap(w_iterable))
if expected_length is not None and len(l) != expected_length:
raise ValueError
return [self.wrap(x) for x in l]
if isinstance(w_iterable, Variable) and expected_length is None:
raise UnwrapException, ("cannot unpack a Variable iterable"
"without knowing its length")
## # XXX TEMPORARY HACK XXX TEMPORARY HACK XXX TEMPORARY HACK
## print ("*** cannot unpack a Variable iterable "
## "without knowing its length,")
## print " assuming a list or tuple with up to 7 items"
## items = []
## w_len = self.len(w_iterable)
## i = 0
## while True:
## w_i = self.wrap(i)
## w_cond = self.eq(w_len, w_i)
## if self.is_true(w_cond):
## break # done
## if i == 7:
## # too many values
## raise OperationError(self.w_AssertionError, self.w_None)
## w_item = self.do_operation('getitem', w_iterable, w_i)
## items.append(w_item)
## i += 1
## return items
## # XXX TEMPORARY HACK XXX TEMPORARY HACK XXX TEMPORARY HACK
elif expected_length is not None:
w_len = self.len(w_iterable)
w_correct = self.eq(w_len, self.wrap(expected_length))
if not self.is_true(w_correct):
e = OperationError(self.w_ValueError, self.w_None)
e.normalize_exception(self)
raise e
return [
self.do_operation('getitem', w_iterable, self.wrap(i))
for i in range(expected_length)
]
return ObjSpace.unpackiterable(self, w_iterable, expected_length)
def unpackiterable(self, w_iterable, expected_length=None):
if not isinstance(w_iterable, Variable):
l = list(self.unwrap(w_iterable))
if expected_length is not None and len(l) != expected_length:
raise ValueError
return [self.wrap(x) for x in l]
if isinstance(w_iterable, Variable) and expected_length is None:
raise UnwrapException, ("cannot unpack a Variable iterable"
"without knowing its length")
## # XXX TEMPORARY HACK XXX TEMPORARY HACK XXX TEMPORARY HACK
## print ("*** cannot unpack a Variable iterable "
## "without knowing its length,")
## print " assuming a list or tuple with up to 7 items"
## items = []
## w_len = self.len(w_iterable)
## i = 0
## while True:
## w_i = self.wrap(i)
## w_cond = self.eq(w_len, w_i)
## if self.is_true(w_cond):
## break # done
## if i == 7:
## # too many values
## raise OperationError(self.w_AssertionError, self.w_None)
## w_item = self.do_operation('getitem', w_iterable, w_i)
## items.append(w_item)
## i += 1
## return items
## # XXX TEMPORARY HACK XXX TEMPORARY HACK XXX TEMPORARY HACK
elif expected_length is not None:
w_len = self.len(w_iterable)
w_correct = self.eq(w_len, self.wrap(expected_length))
if not self.is_true(w_correct):
e = OperationError(self.w_ValueError, self.w_None)
e.normalize_exception(self)
raise e
return [self.do_operation('getitem', w_iterable, self.wrap(i))
for i in range(expected_length)]
return ObjSpace.unpackiterable(self, w_iterable, expected_length)
def getindex_w(self, w_obj, w_exception, objdescr=None, errmsg=None):
if type(w_obj) is W_IntObject:
return w_obj.intval
return ObjSpace.getindex_w(self, w_obj, w_exception, objdescr, errmsg)
def exception_is_valid_obj_as_class_w(space, w_obj):
obj = space.interpclass_w(w_obj)
if isinstance(obj, W_ClassObject):
return True
return BaseObjSpace.exception_is_valid_obj_as_class_w(space, w_obj)
def exception_is_valid_class_w(space, w_cls):
cls = space.interpclass_w(w_cls)
if isinstance(cls, W_ClassObject):
return True
return BaseObjSpace.exception_is_valid_class_w(space, w_cls)
def exception_getclass(space, w_obj):
obj = space.interpclass_w(w_obj)
if isinstance(obj, W_InstanceObject):
return obj.w_class
return BaseObjSpace.exception_getclass(space, w_obj)
def __init__(self, config=None):
self._seen_extras = []
ObjSpace.__init__(self, config=config)
self.setup()
def createexecutioncontext(self):
ec = ObjSpace.createexecutioncontext(self)
ec._py_repr = None
return ec
def __init__(self, config=None):
self._seen_extras = []
ObjSpace.__init__(self, config=config)
def createframe(self, code, w_globals, outer_func=None):
from pypy.objspace.std.fake import CPythonFakeCode, CPythonFakeFrame
if not we_are_translated() and isinstance(code, CPythonFakeCode):
return CPythonFakeFrame(self, code, w_globals)
else:
return ObjSpace.createframe(self, code, w_globals, outer_func)
def exception_is_valid_obj_as_class_w(space, w_obj):
obj = space.interpclass_w(w_obj)
if isinstance(obj, W_ClassObject):
return True
return BaseObjSpace.exception_is_valid_obj_as_class_w(space, w_obj)
def newlist_utf8(self, list_u, is_ascii):
if is_ascii:
return W_ListObject.newlist_utf8(self, list_u)
return ObjSpace.newlist_utf8(self, list_u, False)
def exception_is_valid_class_w(space, w_cls):
cls = space.interpclass_w(w_cls)
if isinstance(cls, W_ClassObject):
return True
return BaseObjSpace.exception_is_valid_class_w(space, w_cls)
def call_method(self, w_obj, methname, *arg_w):
if self.config.objspace.opcodes.CALL_METHOD:
from pypy.objspace.std.callmethod import call_method_opt
return call_method_opt(self, w_obj, methname, *arg_w)
else:
return ObjSpace.call_method(self, w_obj, methname, *arg_w)
def createframe(self, code, w_globals, outer_func=None):
from pypy.objspace.std.fake import CPythonFakeCode, CPythonFakeFrame
if not we_are_translated() and isinstance(code, CPythonFakeCode):
return CPythonFakeFrame(self, code, w_globals)
else:
return ObjSpace.createframe(self, code, w_globals, outer_func)
def getindex_w(self, w_obj, w_exception, objdescr=None):
if type(w_obj) is W_IntObject:
return w_obj.intval
return ObjSpace.getindex_w(self, w_obj, w_exception, objdescr)
def exception_getclass(space, w_obj):
obj = space.interpclass_w(w_obj)
if isinstance(obj, W_InstanceObject):
return obj.w_class
return BaseObjSpace.exception_getclass(space, w_obj)
def createexecutioncontext(self):
ec = ObjSpace.createexecutioncontext(self)
ec._py_repr = None
return ec
def finditem(self, w_obj, w_key):
# performance shortcut to avoid creating the OperationError(KeyError)
if type(w_obj) is self.DictObjectCls:
return w_obj.get(w_key, None)
return ObjSpace.finditem(self, w_obj, w_key)