Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 68 insertions, 0 deletions

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+===============================================
+PEP487: Simpler customisation of class creation
+===============================================
+
+This is a backport of PEP487's simpler customisation of class
+creation by Martin Teichmann <https://www.python.org/dev/peps/pep-0487/>
+for Python versions before 3.6.
+
+PEP487 is free software: you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published
+by the Free Software Foundation, either version 3 of the License,
+or (at your option) any later version.
+
+
+Subclass init
+=============
+
+>>> from pep487 import PEP487Object
+>>> class FooBase(PEP487Object):
+...     foos = set()
+...
+...     def __init_subclass__(cls, **kwargs):
+...         cls.foos.add(cls.__name__)
+
+Using `PEP487Object` as base class all subclasses of FooBase
+will add their name to the common class variable 'foos'.
+
+>>> class Foo1(FooBase):
+...     pass
+>>> class Foo2(FooBase):
+...     pass
+
+Hence:
+
+>>> FooBase.foos
+{'Foo1', 'Foo2'}
+
+
+
+Property names and owner
+========================
+
+If a class object has a method `__set_name__` upon declaration
+of an PEP487Object class, it will be called:
+
+>>> class NamedProperty:
+...     def __set_name__(self, owner, name):
+...         self.context = owner
+...         self.name = name
+
+>>> class Bar(PEP487Object):
+...     foo = NamedProperty()
+...     bar = NamedProperty()
+
+Consequently:
+
+>>> Bar.foo.name is 'foo' and Bar.foo.context is Bar
+True
+>>> Bar.bar.name is 'bar' and Bar.bar.context is Bar
+True
+
+
+Abstract base classes
+=====================
+
+Since `PEP487Object` has a custom metaclass, it is incompatible
+to `abc.ABC`. Therefore `pep487` contains patched versions of `ABC`
+and `ABCMeta`.