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"""Check that instantiating a class with
`abc.ABCMeta` as metaclass fails if it defines
abstract methods.
"""
# pylint: disable=too-few-public-methods, missing-docstring
# pylint: disable=abstract-class-not-used, abstract-class-little-used
# pylint: disable=abstract-method
__revision__ = 0
import abc
import weakref
class GoodClass(object, metaclass=abc.ABCMeta):
pass
class SecondGoodClass(object, metaclass=abc.ABCMeta):
def test(self):
""" do nothing. """
class ThirdGoodClass(object, metaclass=abc.ABCMeta):
""" This should not raise the warning. """
def test(self):
raise NotImplementedError()
class BadClass(object, metaclass=abc.ABCMeta):
@abc.abstractmethod
def test(self):
""" do nothing. """
class SecondBadClass(object, metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def test(self):
""" do nothing. """
class ThirdBadClass(SecondBadClass):
pass
class Structure(object, metaclass=abc.ABCMeta):
@abc.abstractmethod
def __iter__(self):
pass
@abc.abstractmethod
def __len__(self):
pass
@abc.abstractmethod
def __contains__(self):
pass
@abc.abstractmethod
def __hash__(self):
pass
class Container(Structure):
def __contains__(self):
pass
class Sizable(Structure):
def __len__(self):
pass
class Hashable(Structure):
__hash__ = 42
class Iterator(Structure):
def keys(self): # pylint: disable=no-self-use
return iter([1, 2, 3])
__iter__ = keys
class AbstractSizable(Structure):
@abc.abstractmethod
def length(self):
pass
__len__ = length
class NoMroAbstractMethods(Container, Iterator, Sizable, Hashable):
pass
class BadMroAbstractMethods(Container, Iterator, AbstractSizable):
pass
def main():
""" do nothing """
GoodClass()
SecondGoodClass()
ThirdGoodClass()
weakref.WeakKeyDictionary()
weakref.WeakValueDictionary()
NoMroAbstractMethods()
BadMroAbstractMethods() # [abstract-class-instantiated]
BadClass() # [abstract-class-instantiated]
SecondBadClass() # [abstract-class-instantiated]
ThirdBadClass() # [abstract-class-instantiated]
|
