abstractattribute.py
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abstractattribute.py
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	# Copyright (C) 2017 the Software Heritage developers
	# License: GNU General Public License version 3, or any later version
	# See top-level LICENSE file for more information


	class AbstractAttribute:
	"""AbstractAttributes in a base class must be overridden by the subclass.

	It's like the :func:`abc.abstractmethod` decorator, but for things that
	are explicitly attributes/properties, not methods, without the need for
	empty method def boilerplate. Like abc.abstractmethod, the class containing
	AbstractAttributes must inherit from :class:`abc.ABC` or use the
	:class:`abc.ABCMeta` metaclass.

	Usage example::

	import abc
	class ClassContainingAnAbstractAttribute(abc.ABC):
	foo = AbstractAttribute('descriptive docstring for foo')

	"""
	__isabstractmethod__ = True

	def __init__(self, docstring=None):
	if docstring is not None:
	self.__doc__ = 'AbstractAttribute: ' + docstring