Python's inspect
module doesn't seem to be able to inspect the signatures of "built-in" functions, which include functions defined in C extension modules, like those defined by Cython. Is there any way to get the signature of a Python function you have defined in such a module, and specifically in Cython? I am looking to be able to find the available keyword arguments.
MWE:
# mwe.pyx
def example(a, b=None):
pass
and
import pyximport; pyximport.install()
import mwe
import inspect
inspect.signature(mwe.example)
yields:
Traceback (most recent call last):
File "mwe_py.py", line 5, in <module>
inspect.signature(mwe.example)
File "/nix/store/134l79vxb91w8mhxxkj6kb5llf7dmwpm-python3-3.4.5/lib/python3.4/inspect.py", line 2063, in signature
return _signature_internal(obj)
File "/nix/store/134l79vxb91w8mhxxkj6kb5llf7dmwpm-python3-3.4.5/lib/python3.4/inspect.py", line 1965, in _signature_internal
skip_bound_arg=skip_bound_arg)
File "/nix/store/134l79vxb91w8mhxxkj6kb5llf7dmwpm-python3-3.4.5/lib/python3.4/inspect.py", line 1890, in _signature_from_builtin
raise ValueError("no signature found for builtin {!r}".format(func))
ValueError: no signature found for builtin <built-in function example>
In Python 3.4.5 and Cython 0.24.1
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