How to create abstract properties in python abstract classes -

in following code, create base abstract class base. want classes inherit base provide name property, made property @abstractmethod.

then created subclass of base, called base_1, meant supply functionality, still remain abstract. there no name property in base_1, nevertheless python instatinates object of class without error. how 1 create abstract properties?

from abc import abcmeta, abstractmethod class base(object):     __metaclass__ = abcmeta     def __init__(self, strdirconfig):         self.strdirconfig = strdirconfig      @abstractmethod     def _dostuff(self, signals):         pass      @property         @abstractmethod     def name(self):         #this property supplied inheriting classes         #individually         pass   class base_1(base):     __metaclass__ = abcmeta     # class not provide name property, should raise error     def __init__(self, strdirconfig):         super(base_1, self).__init__(strdirconfig)      def _dostuff(self, signals):         print 'base_1 stuff'   class c(base_1):     @property     def name(self):         return 'class c'   if __name__ == '__main__':     b1 = base_1('abc')   

until python 3.3, cannot nest @abstractmethod , @property.

use @abstractproperty create abstract properties (docs).

from abc import abcmeta, abstractmethod, abstractproperty  class base(object):     # ...     @abstractproperty     def name(self):         pass 

the code raises correct exception:

 traceback (most recent call last):   file "foo.py", line 36, in      b1 = base_1('abc')   typeerror: can't instantiate abstract class base_1 abstract methods name