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""" Checks assigning attributes not found in class slots
will trigger assigning-non-slot warning.
"""
# pylint: disable=too-few-public-methods, no-init, missing-docstring, no-absolute-import, import-error
from collections import deque
from missing import Unknown
class Empty(object):
""" empty """
class Bad(object):
""" missing not in slots. """
__slots__ = ['member']
def __init__(self):
self.missing = 42 # [assigning-non-slot]
class Bad2(object):
""" missing not in slots """
__slots__ = [deque.__name__, 'member']
def __init__(self):
self.deque = 42
self.missing = 42 # [assigning-non-slot]
class Bad3(Bad):
""" missing not found in slots """
__slots__ = ['component']
def __init__(self):
self.component = 42
self.member = 24
self.missing = 42 # [assigning-non-slot]
super(Bad3, self).__init__()
class Good(Empty):
""" missing not in slots, but Empty doesn't
specify __slots__.
"""
__slots__ = ['a']
def __init__(self):
self.missing = 42
class Good2(object):
""" Using __dict__ in slots will be safe. """
__slots__ = ['__dict__', 'comp']
def __init__(self):
self.comp = 4
self.missing = 5
class PropertyGood(object):
""" Using properties is safe. """
__slots__ = ['tmp', '_value']
@property
def test(self):
return self._value
@test.setter
def test(self, value):
# pylint: disable=attribute-defined-outside-init
self._value = value
def __init__(self):
self.test = 42
class PropertyGood2(object):
""" Using properties in the body of the class is safe. """
__slots__ = ['_value']
def _getter(self):
return self._value
def _setter(self, value):
# pylint: disable=attribute-defined-outside-init
self._value = value
test = property(_getter, _setter)
def __init__(self):
self.test = 24
class UnicodeSlots(object):
"""Using unicode objects in __slots__ is okay.
On Python 3.3 onward, u'' is equivalent to '',
so this test should be safe for both versions.
"""
__slots__ = (u'first', u'second')
def __init__(self):
self.first = 42
self.second = 24
class DataDescriptor(object):
def __init__(self, name, default=''):
self.__name = name
self.__default = default
def __get__(self, inst, cls):
return getattr(inst, self.__name, self.__default)
def __set__(self, inst, value):
setattr(inst, self.__name, value)
class NonDataDescriptor(object):
def __get__(self, inst, cls):
return 42
class SlotsWithDescriptor(object):
__slots__ = ['_err']
data_descriptor = DataDescriptor('_err')
non_data_descriptor = NonDataDescriptor()
missing_descriptor = Unknown()
def dont_emit_for_descriptors():
inst = SlotsWithDescriptor()
# This should not emit, because attr is
# a data descriptor
inst.data_descriptor = 'foo'
inst.non_data_descriptor = 'lala' # [assigning-non-slot]
return
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