_has_namespace_at() - Code Metrics - Inspection of "Eliminate top-level function." - mwchase/class-namespaces - Measure and Improve Code Quality continuously with Scrutinizer

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by Max

created 2016-11-21 05:45 UTC

_has_namespace_at() A

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Tests	2
CRAP Score	1

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Changes	4
Bugs	0	Features	0

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cc	1
c	4
b	0
f	0
dl	0
loc	3
ccs	2
cts	2
cp	1
crap	1
rs	10

"""Class Namespaces (internal module).

All of the guts of the class namespace implementation.

"""


# See https://blog.ionelmc.ro/2015/02/09/understanding-python-metaclasses/

import collections.abc
import functools
import itertools
import weakref

from .descriptor_inspector import _DescriptorInspector
from .flags import ENABLE_SET_NAME


_PROXY_INFOS = weakref.WeakKeyDictionary()


def _is_namespaceable(cls):
    """Partial function for filter."""
    return isinstance(cls, Namespaceable)


def _mro_to_chained(mro, dct):
    """Return a chained map of lookups for the given namespace and mro."""
    return collections.ChainMap(*[
        Namespace.get_namespace(cls, dct.path) for cls in
        filter(
            functools.partial(Namespace.namespace_exists, dct.path),
            itertools.takewhile(
                functools.partial(Namespace.no_blocker, dct),
                filter(_is_namespaceable, mro)))])


def _instance_map(ns_proxy):
    """Return a map, possibly chained, of lookups for the given instance."""
    dct, instance, _ = _PROXY_INFOS[ns_proxy]
    if instance is not None:
        if isinstance(instance, Namespaceable):
            return _mro_to_chained(instance.__mro__, dct)
        else:
            return Namespace.get_namespace(instance, dct.path)
    else:
        return {}


def _mro_map(ns_proxy):
    """Return a chained map of lookups for the given owner class."""
    dct, _, owner = _PROXY_INFOS[ns_proxy]
    mro = owner.__mro__
    mro = mro[mro.index(dct.parent_object):]
    return _mro_to_chained(mro, dct)


def _retarget(ns_proxy):
    """Convert a class lookup to an instance lookup, if needed."""
    dct, instance, owner = _PROXY_INFOS[ns_proxy]
    if instance is None and isinstance(type(owner), Namespaceable):
        instance, owner = owner, type(owner)
        dct = Namespace.get_namespace(owner, dct.path)
        ns_proxy = _NamespaceProxy(dct, instance, owner)
    return ns_proxy


def _get(a_map, name):
    """Return a _DescriptorInspector around the attribute, or None."""
    try:
        value = a_map[name]
    except KeyError:
        return None
    else:
        return _DescriptorInspector(value)


def _delete(dct, name):
    """Attempt to delete `name` from `dct`. Raise AttributeError if missing."""
    try:
        del dct[name]
    except KeyError:
        raise AttributeError(name)


def _has_get(value):
    """Return whether the value is a wrapped getter descriptor."""
    return value is not None and value.has_get


def _is_data(value):
    """Return whether the value is a wrapped data descriptor."""
    return value is not None and value.is_data


def _get_data(dct, name):
    """Return the data descriptor associated with `name` in `dct`, if any."""
    value = _get(dct, name)
    if _is_data(value):
        return value


class _NamespaceProxy:

    """Proxy object for manipulating and querying namespaces."""

    __slots__ = '__weakref__',

    def __init__(self, dct, instance, owner):
        _PROXY_INFOS[self] = dct, instance, owner

    def __dir__(self):
        return collections.ChainMap(_instance_map(self), _mro_map(self))

    def __getattribute__(self, name):
        self = _retarget(self)
        dct, instance, owner = _PROXY_INFOS[self]
        if owner is None:
            return dct[name]
        instance_map = _instance_map(self)
        mro_map = _mro_map(self)
        instance_value = _get(instance_map, name)
        mro_value = _get(mro_map, name)
        if _is_data(mro_value):
            return mro_value.get(instance, owner)
        elif issubclass(owner, type) and _has_get(instance_value):
            return instance_value.get(None, instance)
        elif instance_value is not None:
            return instance_value.object
        elif _has_get(mro_value):
            return mro_value.get(instance, owner)
        elif mro_value is not None:
            return mro_value.object
        else:
            raise AttributeError(name)

    def __setattr__(self, name, value):
        self = _retarget(self)
        dct, instance, owner = _PROXY_INFOS[self]
        if owner is None:
            dct[name] = value
            return
        if instance is None:
            real_map = Namespace.get_namespace(owner, dct.path)
            real_map[name] = value
            return
        mro_map = _mro_map(self)
        target_value = _get_data(mro_map, name)
        if target_value is not None:
            target_value.set(instance, value)
            return
        instance_map = Namespace.get_namespace(instance, dct.path)
        instance_map[name] = value

    def __delattr__(self, name):
        self = _retarget(self)
        dct, instance, owner = _PROXY_INFOS[self]
        if owner is None:
            _delete(dct, name)
            return
        real_map = Namespace.get_namespace(owner, dct.path)
        if instance is None:
            _delete(real_map, name)
            return
        value = _get_data(real_map, name)
        if value is not None:
            value.delete(instance)
            return
        instance_map = Namespace.get_namespace(instance, dct.path)
        _delete(instance_map, name)

    def __enter__(self):
        dct, _, _ = _PROXY_INFOS[self]
        return dct.__enter__()

    def __exit__(self, exc_type, exc_value, traceback):
        dct, _, _ = _PROXY_INFOS[self]
        return dct.__exit__(exc_type, exc_value, traceback)


class Namespace(dict):

    """Namespace."""

    __slots__ = 'name', 'scope', 'parent', 'active', 'parent_object'

    __namespaces = {}

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        bad_values = tuple(
            value for value in self.values() if
            isinstance(value, (Namespace, _NamespaceProxy)))
        if bad_values:
            raise ValueError('Bad values: {}'.format(bad_values))
        self.name = None
        self.scope = None
        self.parent = None
        self.active = False
        self.parent_object = None

    @classmethod
    def premake(cls, name, parent):
        """Return an empty namespace with the given name and parent."""
        self = cls()
        self.name = name
        self.parent = parent
        return self

    def __setitem__(self, key, value):
        if (
                self.parent_object is not None and
                isinstance(value, Namespace) and value.name != key):
            value.push(key, self.scope)
            value.add(self.parent_object)
        super().__setitem__(key, value)

    def __enter__(self):
        self.activate()
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        if self.name is None:
            raise RuntimeError('Namespace must be named.')
        self.deactivate()

    @property
    def path(self):
        """Return the full path of the namespace."""
        if self.name is None or self.parent is None:
            raise ValueError
        if isinstance(self.parent, Namespace):
            parent_path = self.parent.path
        else:
            parent_path = ()
        return parent_path + (self.name,)

    @classmethod
    def __get_helper(cls, target, path):
        """Return the namespace for `target` at `path`, create if needed."""
        if isinstance(target, Namespaceable):
            path_ = target, path
            namespaces = cls.__namespaces
        else:
            path_ = path
            try:
                namespaces = target.__namespaces
            except AttributeError:
                namespaces = {}
                target.__namespaces = namespaces
        return path_, namespaces

    @classmethod
    def namespace_exists(cls, path, target):
        """Return whether the given namespace exists."""
        path_, namespaces = cls.__get_helper(target, path)
        return path_ in namespaces

    @classmethod
    def get_namespace(cls, target, path):
        """Return a namespace with given target and path, create if needed."""
        path_, namespaces = cls.__get_helper(target, path)
        try:
            return namespaces[path_]
        except KeyError:
            if len(path) == 1:
                parent = {}
            else:
                parent = cls.get_namespace(target, path[:-1])
            return namespaces.setdefault(path_, cls.premake(path[-1], parent))

    @classmethod
    def no_blocker(cls, dct, cls_):
        """Return False if there's a non-Namespace object in the path."""
        try:
            namespace = vars(cls_)
            for name in dct.path:
                namespace = namespace[name]
                if not isinstance(namespace, cls):
                    return False
        except KeyError:
try:
    raises_exception()
except:  # Could be removed
    pass
            pass
        return True

    def add(self, target):
        """Add self as a namespace under target."""
        path, namespaces = self.__get_helper(target, self.path)
        res = namespaces.setdefault(path, self)
        if res is self:
            self.parent_object = target

    def set_if_none(self, name, value):
        """Set the attribute `name` to `value`, if it's initially None."""
        if getattr(self, name) is None:
            setattr(self, name, value)

    def push(self, name, scope):
        """Bind self to the given name and scope, and activate."""
        self.set_if_none('name', name)
        self.set_if_none('scope', scope)
        self.set_if_none('parent', scope.dicts[0])
        if name != self.name:
            raise ValueError('Cannot rename namespace')
        if scope is not self.scope:
            raise ValueError('Cannot reuse namespace')
        if scope.dicts[0] is not self.parent:
            raise ValueError('Cannot reparent namespace')
        self.scope.namespaces.append(self)
        self.activate()

    def activate(self):
        """Take over as the scope for the target."""
        if self.scope is not None and not self.active:
            if self.scope.dicts[0] is not self.parent:
                raise ValueError('Cannot reparent namespace')
            self.active = True
            self.scope.dicts.insert(0, self)

    def deactivate(self):
        """Stop being the scope for the target."""
        if self.scope is not None and self.active:
            self.active = False
            self.scope.dicts.pop(0)

    def __get__(self, instance, owner):
        return _NamespaceProxy(self, instance, owner)


class _NamespaceScope(collections.abc.MutableMapping):

    """The class creation namespace for Namespaceables."""

    __slots__ = 'dicts', 'namespaces'

    def __init__(self, dct):
        self.dicts = [dct]
        self.namespaces = []

    def __getitem__(self, key):
        value = collections.ChainMap(*self.dicts)[key]
        if isinstance(value, Namespace):
            value = _NamespaceProxy(value, None, None)
        return value

    def __setitem__(self, key, value):
        dct = self.dicts[0]
        if isinstance(value, _NamespaceProxy):
            value, _, _ = _PROXY_INFOS[value]
        if isinstance(value, Namespace) and value.name != key:
            value.push(key, self)
        dct[key] = value

    def __delitem__(self, key):
        del self.dicts[0][key]

    def __iter__(self):
        return iter(collections.ChainMap(*self.dicts))

    def __len__(self):
        return len(collections.ChainMap(*self.dicts))


_NAMESPACE_SCOPES = weakref.WeakKeyDictionary()


class Namespaceable(type):

    """Metaclass for classes that can contain namespaces."""

    @classmethod
    def __prepare__(mcs, name, bases, **kwargs):
        return _NamespaceScope(super().__prepare__(name, bases, **kwargs))

    def __new__(mcs, name, bases, dct, **kwargs):
        cls = super().__new__(mcs, name, bases, dct.dicts[0], **kwargs)
        _NAMESPACE_SCOPES[cls] = dct
        for namespace in dct.namespaces:
            namespace.add(cls)
            if ENABLE_SET_NAME:
                for name, value in namespace.items():
                    wrapped = _DescriptorInspector(value)
                    if wrapped.has_set_name:
                        wrapped.set_name(cls, name)
        return cls

    def __setattr__(cls, name, value):
        if isinstance(value, Namespace) and value.name != name:
            value.push(name, _NAMESPACE_SCOPES[cls])
            value.add(cls)
        if issubclass(cls, Namespaceable):
            super().__setattr__(cls, name, value)
        else:
            super().__setattr__(name, value)


1		"""Class Namespaces (internal module).
2
3		All of the guts of the class namespace implementation.
4
5		"""
6
7
8		# See https://blog.ionelmc.ro/2015/02/09/understanding-python-metaclasses/
9
10	6	import collections.abc
11	6	import functools
12	6	import itertools
13	6	import weakref
14
15	6	from .descriptor_inspector import _DescriptorInspector
16	6	from .flags import ENABLE_SET_NAME
17
18
19	6	_PROXY_INFOS = weakref.WeakKeyDictionary()
20
21
22	6	def _is_namespaceable(cls):
23		"""Partial function for filter."""
24	6	return isinstance(cls, Namespaceable)
25
26
27	6	def _mro_to_chained(mro, dct):
28		"""Return a chained map of lookups for the given namespace and mro."""
29	6	return collections.ChainMap(*[
30		Namespace.get_namespace(cls, dct.path) for cls in
31		filter(
32		functools.partial(Namespace.namespace_exists, dct.path),
33		itertools.takewhile(
34		functools.partial(Namespace.no_blocker, dct),
35		filter(_is_namespaceable, mro)))])
36
37
38	6	def _instance_map(ns_proxy):
39		"""Return a map, possibly chained, of lookups for the given instance."""
40	6	dct, instance, _ = _PROXY_INFOS[ns_proxy]
41	6	if instance is not None:
42	6	if isinstance(instance, Namespaceable):
43	6	return _mro_to_chained(instance.__mro__, dct)
44		else:
45	6	return Namespace.get_namespace(instance, dct.path)
46		else:
47	6	return {}
48
49
50	6	def _mro_map(ns_proxy):
51		"""Return a chained map of lookups for the given owner class."""
52	6	dct, _, owner = _PROXY_INFOS[ns_proxy]
53	6	mro = owner.__mro__
54	6	mro = mro[mro.index(dct.parent_object):]
55	6	return _mro_to_chained(mro, dct)
56
57
58	6	def _retarget(ns_proxy):
59		"""Convert a class lookup to an instance lookup, if needed."""
60	6	dct, instance, owner = _PROXY_INFOS[ns_proxy]
61	6	if instance is None and isinstance(type(owner), Namespaceable):
62	6	instance, owner = owner, type(owner)
63	6	dct = Namespace.get_namespace(owner, dct.path)
64	6	ns_proxy = _NamespaceProxy(dct, instance, owner)
65	6	return ns_proxy
66
67
68	6	def _get(a_map, name):
69		"""Return a _DescriptorInspector around the attribute, or None."""
70	6	try:
71	6	value = a_map[name]
72	6	except KeyError:
73	6	return None
74		else:
75	6	return _DescriptorInspector(value)
76
77
78	6	def _delete(dct, name):
79		"""Attempt to delete `name` from `dct`. Raise AttributeError if missing."""
80	6	try:
81	6	del dct[name]
82	6	except KeyError:
83	6	raise AttributeError(name)
84
85
86	6	def _has_get(value):
87		"""Return whether the value is a wrapped getter descriptor."""
88	6	return value is not None and value.has_get
89
90
91	6	def _is_data(value):
92		"""Return whether the value is a wrapped data descriptor."""
93	6	return value is not None and value.is_data
94
95
96	6	def _get_data(dct, name):
97		"""Return the data descriptor associated with `name` in `dct`, if any."""
98	6	value = _get(dct, name)
99	6	if _is_data(value):
100		return value
101
102
103	6	class _NamespaceProxy:
104
105		"""Proxy object for manipulating and querying namespaces."""
106
107	6	__slots__ = '__weakref__',
108
109	6	def __init__(self, dct, instance, owner):
110	6	_PROXY_INFOS[self] = dct, instance, owner
111
112	6	def __dir__(self):
113	6	return collections.ChainMap(_instance_map(self), _mro_map(self))
114
115	6	def __getattribute__(self, name):
116	6	self = _retarget(self)
117	6	dct, instance, owner = _PROXY_INFOS[self]
118	6	if owner is None:
119	6	return dct[name]
120	6	instance_map = _instance_map(self)
121	6	mro_map = _mro_map(self)
122	6	instance_value = _get(instance_map, name)
123	6	mro_value = _get(mro_map, name)
124	6	if _is_data(mro_value):
125	6	return mro_value.get(instance, owner)
126	6	elif issubclass(owner, type) and _has_get(instance_value):
127	6	return instance_value.get(None, instance)
128	6	elif instance_value is not None:
129	6	return instance_value.object
130	6	elif _has_get(mro_value):
131	6	return mro_value.get(instance, owner)
132	6	elif mro_value is not None:
133	6	return mro_value.object
134		else:
135	6	raise AttributeError(name)
136
137	6	def __setattr__(self, name, value):
138	6	self = _retarget(self)
139	6	dct, instance, owner = _PROXY_INFOS[self]
140	6	if owner is None:
141	6	dct[name] = value
142	6	return
143	6	if instance is None:
144	6	real_map = Namespace.get_namespace(owner, dct.path)
145	6	real_map[name] = value
146	6	return
147	6	mro_map = _mro_map(self)
148	6	target_value = _get_data(mro_map, name)
149	6	if target_value is not None:
150		target_value.set(instance, value)
151		return
152	6	instance_map = Namespace.get_namespace(instance, dct.path)
153	6	instance_map[name] = value
154
155	6	def __delattr__(self, name):
156	6	self = _retarget(self)
157	6	dct, instance, owner = _PROXY_INFOS[self]
158	6	if owner is None:
159	6	_delete(dct, name)
160	6	return
161	6	real_map = Namespace.get_namespace(owner, dct.path)
162	6	if instance is None:
163	6	_delete(real_map, name)
164	6	return
165	6	value = _get_data(real_map, name)
166	6	if value is not None:
167		value.delete(instance)
168		return
169	6	instance_map = Namespace.get_namespace(instance, dct.path)
170	6	_delete(instance_map, name)
171
172	6	def __enter__(self):
173	6	dct, _, _ = _PROXY_INFOS[self]
174	6	return dct.__enter__()
175
176	6	def __exit__(self, exc_type, exc_value, traceback):
177	6	dct, _, _ = _PROXY_INFOS[self]
178	6	return dct.__exit__(exc_type, exc_value, traceback)
179
180
181	6	class Namespace(dict):
182
183		"""Namespace."""
184
185	6	__slots__ = 'name', 'scope', 'parent', 'active', 'parent_object'
186
187	6	__namespaces = {}
188
189	6	def __init__(self, args, *kwargs):
190	6	super().__init__(args, *kwargs)
191	6	bad_values = tuple(
192		value for value in self.values() if
193		isinstance(value, (Namespace, _NamespaceProxy)))
194	6	if bad_values:
195	6	raise ValueError('Bad values: {}'.format(bad_values))
196	6	self.name = None
197	6	self.scope = None
198	6	self.parent = None
199	6	self.active = False
200	6	self.parent_object = None
201
202	6	@classmethod
203		def premake(cls, name, parent):
204		"""Return an empty namespace with the given name and parent."""
205	6	self = cls()
206	6	self.name = name
207	6	self.parent = parent
208	6	return self
209
210	6	def __setitem__(self, key, value):
211	6	if (
212		self.parent_object is not None and
213		isinstance(value, Namespace) and value.name != key):
214	6	value.push(key, self.scope)
215	6	value.add(self.parent_object)
216	6	super().__setitem__(key, value)
217
218	6	def __enter__(self):
219	6	self.activate()
220	6	return self
221
222	6	def __exit__(self, exc_type, exc_value, traceback):
223	6	if self.name is None:
224	6	raise RuntimeError('Namespace must be named.')
225	6	self.deactivate()
226
227	6	@property
228		def path(self):
229		"""Return the full path of the namespace."""
230	6	if self.name is None or self.parent is None:
231		raise ValueError
232	6	if isinstance(self.parent, Namespace):
233	6	parent_path = self.parent.path
234		else:
235	6	parent_path = ()
236	6	return parent_path + (self.name,)
237
238	6	@classmethod
239		def __get_helper(cls, target, path):
240		"""Return the namespace for `target` at `path`, create if needed."""
241	6	if isinstance(target, Namespaceable):
242	6	path_ = target, path
243	6	namespaces = cls.__namespaces
244		else:
245	6	path_ = path
246	6	try:
247	6	namespaces = target.__namespaces
248	6	except AttributeError:
249	6	namespaces = {}
250	6	target.__namespaces = namespaces
251	6	return path_, namespaces
252
253	6	@classmethod
254		def namespace_exists(cls, path, target):
255		"""Return whether the given namespace exists."""
256	6	path_, namespaces = cls.__get_helper(target, path)
257	6	return path_ in namespaces
258
259	6	@classmethod
260		def get_namespace(cls, target, path):
261		"""Return a namespace with given target and path, create if needed."""
262	6	path_, namespaces = cls.__get_helper(target, path)
263	6	try:
264	6	return namespaces[path_]
265	6	except KeyError:
266	6	if len(path) == 1:
267	6	parent = {}
268		else:
269	6	parent = cls.get_namespace(target, path[:-1])
270	6	return namespaces.setdefault(path_, cls.premake(path[-1], parent))
271
272	6	@classmethod
273		def no_blocker(cls, dct, cls_):
274		"""Return False if there's a non-Namespace object in the path."""
275	6	try:
276	6	namespace = vars(cls_)
277	6	for name in dct.path:
278	6	namespace = namespace[name]
279	6	if not isinstance(namespace, cls):
280	6	return False
281	6	except KeyError:
		1 ignored issue – show Unused Code introduced 2016-11-20 03:53 UTC by Report Bug Copy Issue Report This except handler seems to be unused and could be removed. Except handlers which only contain `pass` and do not have an `else` clause can usually simply be removed: try: raises_exception() except: # Could be removed pass Loading history...
282	6	pass
283	6	return True
284
285	6	def add(self, target):
286		"""Add self as a namespace under target."""
287	6	path, namespaces = self.__get_helper(target, self.path)
288	6	res = namespaces.setdefault(path, self)
289	6	if res is self:
290	6	self.parent_object = target
291
292	6	def set_if_none(self, name, value):
293		"""Set the attribute `name` to `value`, if it's initially None."""
294	6	if getattr(self, name) is None:
295	6	setattr(self, name, value)
296
297	6	def push(self, name, scope):
298		"""Bind self to the given name and scope, and activate."""
299	6	self.set_if_none('name', name)
300	6	self.set_if_none('scope', scope)
301	6	self.set_if_none('parent', scope.dicts[0])
302	6	if name != self.name:
303	6	raise ValueError('Cannot rename namespace')
304	6	if scope is not self.scope:
305		raise ValueError('Cannot reuse namespace')
306	6	if scope.dicts[0] is not self.parent:
307		raise ValueError('Cannot reparent namespace')
308	6	self.scope.namespaces.append(self)
309	6	self.activate()
310
311	6	def activate(self):
312		"""Take over as the scope for the target."""
313	6	if self.scope is not None and not self.active:
314	6	if self.scope.dicts[0] is not self.parent:
315		raise ValueError('Cannot reparent namespace')
316	6	self.active = True
317	6	self.scope.dicts.insert(0, self)
318
319	6	def deactivate(self):
320		"""Stop being the scope for the target."""
321	6	if self.scope is not None and self.active:
322	6	self.active = False
323	6	self.scope.dicts.pop(0)
324
325	6	def __get__(self, instance, owner):
326	6	return _NamespaceProxy(self, instance, owner)
327
328
329	6	class _NamespaceScope(collections.abc.MutableMapping):
330
331		"""The class creation namespace for Namespaceables."""
332
333	6	__slots__ = 'dicts', 'namespaces'
334
335	6	def __init__(self, dct):
336	6	self.dicts = [dct]
337	6	self.namespaces = []
338
339	6	def __getitem__(self, key):
340	6	value = collections.ChainMap(*self.dicts)[key]
341	6	if isinstance(value, Namespace):
342	6	value = _NamespaceProxy(value, None, None)
343	6	return value
344
345	6	def __setitem__(self, key, value):
346	6	dct = self.dicts[0]
347	6	if isinstance(value, _NamespaceProxy):
348	6	value, _, _ = _PROXY_INFOS[value]
349	6	if isinstance(value, Namespace) and value.name != key:
350	6	value.push(key, self)
351	6	dct[key] = value
352
353	6	def __delitem__(self, key):
354	6	del self.dicts[0][key]
355
356	6	def __iter__(self):
357		return iter(collections.ChainMap(*self.dicts))
358
359	6	def __len__(self):
360		return len(collections.ChainMap(*self.dicts))
361
362
363	6	_NAMESPACE_SCOPES = weakref.WeakKeyDictionary()
364
365
366	6	class Namespaceable(type):
367
368		"""Metaclass for classes that can contain namespaces."""
369
370	6	@classmethod
371		def __prepare__(mcs, name, bases, **kwargs):
372	6	return _NamespaceScope(super().__prepare__(name, bases, **kwargs))
373
374	6	def __new__(mcs, name, bases, dct, **kwargs):
375	6	cls = super().__new__(mcs, name, bases, dct.dicts[0], **kwargs)
376	6	_NAMESPACE_SCOPES[cls] = dct
377	6	for namespace in dct.namespaces:
378	6	namespace.add(cls)
379	6	if ENABLE_SET_NAME:
380	2	for name, value in namespace.items():
381	2	wrapped = _DescriptorInspector(value)
382	2	if wrapped.has_set_name:
383	2	wrapped.set_name(cls, name)
384	6	return cls
385
386	6	def __setattr__(cls, name, value):
387	6	if isinstance(value, Namespace) and value.name != name:
388	6	value.push(name, _NAMESPACE_SCOPES[cls])
389	6	value.add(cls)
390	6	if issubclass(cls, Namespaceable):
391	6	super().__setattr__(cls, name, value)
392		else:
393		super().__setattr__(name, value)
394

mwchase / class-namespaces

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