cython_pyro4_test.pyx

import Pyro4
import inspect

@Pyro4.expose
class C:
    def m(self):
        return 0

print(Pyro4.util.get_exposed_members(C()))
# => {'methods': set(), 'oneway': set(), 'attrs': set()}

print(C.m)
# => <cyfunction C.m at 0x10f954d38>

print(type(C.m))
# => <class 'cython_function_or_method'>

print(inspect.isfunction(C.m))
# => False

print(inspect.ismethod(C.m))
# => False

print(inspect.ismethoddescriptor(C.m))
# => True

run.py

import cython_pyro4_test

setup.py

from distutils.core import setup
from distutils.extension import Extension
from Cython.Build import cythonize

ext_modules = cythonize([
    Extension("cython_pyro4_test", ["cython_pyro4_test.pyx"]),
], language_level=3)

setup(
    name='cython_pyro4_test',
    ext_modules=ext_modules,
    zip_safe=False,
    requires=["Pyro4", "Cython"],
    setup_requires=["Cython"],
)