It seems as if that when I have an abstract base class that inherits from gevent.Greenlet (which inherits from the C extension module greenlet: https://github.com/python-greenlet/greenlet) then classes that implement it do not raise any of the abc errors about unimplemented methods.
class ActorBase(gevent.Greenlet):
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def foo(self):
print "foo"
class ActorBaseTest(ActorBase):
def bar(self):
print "bar"
abt = ActorBaseTest() # no errors!
If I inherit from object it fails as expected:
class ActorBase(object):
__metaclass__ = abc.ABCMeta
@abc.abstractmethod
def foo(self):
print "foo"
class ActorBaseTest(ActorBase):
def bar(self):
print "bar"
>>> abt = ActorBaseTest()
Traceback (most recent call last):
File "/home/dw/.virtualenvs/prj/local/lib/python2.7/site-packages/IPython/core/interactiveshell.py", line 2827, in run_code
exec code_obj in self.user_global_ns, self.user_ns
File "<ipython-input-6-d67a142e7297>", line 1, in <module>
abt = ActorBaseTest()
TypeError: Can't instantiate abstract class ActorBaseTest with abstract methods foo
What is the right way to implement this functionality?