classmethod is unable to decorate a callable that is function (and not method) #3072
Description
I am new to cython and I would be grateful if someone could help me with the following issue.
I have started with the code snippet itself. I request patience on part of the reader, i have explained everything at the bottom:
util.py:
import inspect
class Singleton(type):
_instances=[]
def __call__(cls, *args, **kwargs):
if cls not in cls._instances:
cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs)
class MetaResult(Singleton):
def __getattribute__(cls, name):
return super().__getattribute__(name)
class Result(metaclass=MetaResult):
@staticmethod
def res_decorator(func):
def funcwrap(*args, **kwargs):
sig = inspect.signature(func)
bound_sig = sig.bind(*args, **kwargs)
bound_sig.apply_defaults()
#additional code to extract function arguments
return funcwrap check_params.py
from util import Result as _Result
from abc import ABCMeta as _ABCMeta
class paramparse(metaclass=_ABCMeta)
@classmethod
@_Result.res_decorator
def parse_flash_params(cls, flash_config_path):
#some codeNow, I cythonize the file check_params.py with following setup :
cythonize.py
import os as _os
from pathlib import Path as _Path
from distutils.core import setup as _setup
from Cython.Distutils import build_ext as _build_ext
files_to_compile = []
def cython_build(source_path):
for dirpath, _, fnames in os.walk(source_path):
for fname in [x for x in fnames if f.endswith('.py'):
fname = _Path(fname)
files_to_compile.append(fname)
for e in files_to_compile:
e.cython_directives = {'binding':True, 'language_level':3}
_setup(name="Proj1",cmdclass={'build_ext':_build_ext}, ext_modules=files_to_compile)cythonized as: python cythonize.py --path C:\directory_where_check_params_exist
generates a pyd file on which the following unit tests were attempted to run:
Now, coming to the usage, in the unit tests:
unit_test_check_params.py
from check_params import * #getting error here , details outside the code
# unit tests written herecheck_params.pyx:112: in init check_params ??? E
TypeError: Class-level classmethod() can only be called on a method_descriptor or instance method.
So when i debug this, the error appears as being caused because of the classmethod descriptor over decorator which basically returns a function and not a method (see static method attribute applied in util.pu) (def parse_flash_params) in check_params.py
Please let me know if you need more information.