How to create abstract properties in python abstract classes

Question

In the following code, I create a base abstract class Base. I want all the classes that inherit from Base to provide the name property

Answer 1

Since Python 3.3 a bug was fixed meaning the property() decorator is now correctly identified as abstract when applied to an abstract method.

Note: Order matters, you have to use @property before @abstractmethod

Python 3.3+: (python docs):

class C(ABC):
    @property
    @abstractmethod
    def my_abstract_property(self):
        ...

Python 2: (python docs)

class C(ABC):
    @abstractproperty
    def my_abstract_property(self):
        ...

Answer 2

Based on James answer above

def compatibleabstractproperty(func):

    if sys.version_info > (3, 3):             
        return property(abstractmethod(func))
    else:
        return abstractproperty(func)

and use it as a decorator

@compatibleabstractproperty
def env(self):
    raise NotImplementedError()

Answer 3

Until Python 3.3, you cannot nest @abstractmethod and @property.

Use @abstractproperty to create abstract properties (docs).

from abc import ABCMeta, abstractmethod, abstractproperty

class Base(object):
    # ...
    @abstractproperty
    def name(self):
        pass

The code now raises the 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 with abstract methods name