Python-сообщество

# -*- coding: utf-8 -*-

class SomeClass(object):

    def some_func(self):
        pass

    #Здесь все работает
    some_func.description = 'This is some_func description'

    def get_value(self):
        return 1

    def set_value(self, val):
        pass

    something = property(get_value, set_value)
    #А здесь не работает
    #something.description = 'This is something property description'

sc = SomeClass()
print sc.some_func
print sc.some_func.description
print sc.something
#Соответственно здесь тоже ошибка
#print sc.something.description

class Foo(object):
    def do_foo(self):
        'Does foo'
        pass

    def get_bar(self):
        pass

    bar = property(get_bar, doc='get/set bar')

print Foo.do_foo.__doc__
print Foo.bar.__doc__

# -*- coding: utf-8 -*-

def register_attribute(klass, attrib, attrib_type):
    klass.attribute_types[attrib] = attrib_type

class BaseObjectMetaclass(type):

    def __new__(self, name, bases, attrs):
        attribute_types = {}
        for base in bases:
            if isinstance(base, BaseObjectMetaclass):
                attribute_types.update(base.attribute_types)
        attrs['attribute_types'] = attribute_types
        return super(BaseObjectMetaclass, self).__new__(self, name, bases, attrs)


class BaseObject(object):
    __metaclass__ = BaseObjectMetaclass
    SHORT,LONG = range(2) #attribute type

    @classmethod
    def get_registered_attributes(klass):
        return klass.attribute_types

    @classmethod
    def get_attribute_type(klass, attrib):
        return klass.attribute_types[attrib]


class A(BaseObject):

    @property
    def attr1(self):
        pass

    @property
    def attr2(self):
        pass

register_attribute(A, 'attr1', BaseObject.SHORT)
register_attribute(A, 'attr2', BaseObject.LONG)


class B(A):

    @property
    def attr3(self):
        pass

register_attribute(B, 'attr3', BaseObject.SHORT)

a = A()
print a.get_registered_attributes()
print a.get_attribute_type('attr1')
b = B()
print b.get_registered_attributes()
print b.get_attribute_type('attr2')
print b.get_attribute_type('attr3')

# -*- coding: utf-8 -*-

class MyProperty(object):

    SHORT,LONG = range(2)

    def __init__(self, attrib_type, fget=None, fset=None):
        self.fget = fget
        self.fset = fset
        self.type = attrib_type

    def __get__(self, obj, objtype=None):
        if obj is None:
            return self
        return self.fget(obj)

    def __set__(self, obj, value):
        self.fset(obj, value)


class A(object):

    def __init__(self):
        self._attr1 = None

    def get_attr1(self):
        return self._attr1

    def set_attr1(self, value):
        self._attr1 = value

    attr1 = MyProperty(MyProperty.SHORT, get_attr1, set_attr1)

class B(A):

    def __init__(self):
        self._attr2 = None

    def get_attr2(self):
        return self._attr2

    def set_attr2(self, value):
        self._attr2 = value

    attr2 = MyProperty(MyProperty.LONG, get_attr2, set_attr2)


a = A()
b = B()
a.attr1 = 5
b.attr1 = 6
b.attr2 = 7
print a.attr1, b.attr1, b.attr2
b_type = type(b)
a_type = type(a)
print a_type.attr1.type, b_type.attr1.type, b_type.attr2.type