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I'm now testing to change getfullargspect to signature. It came out that signature can't accept bound method with only _VAR_KEYWORD. This test case will gave a ValueError:
 >>> class C:
 def m2(**kw):
 pass
 >>> c = C()
 >>> ip.signature(c.m2)
 Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/lib/python3.6/inspect.py", line 3002, in signature
 return Signature.from_callable(obj, follow_wrapped=follow_wrapped)
 File "/usr/lib/python3.6/inspect.py", line 2752, in from_callable
 follow_wrapper_chains=follow_wrapped)
 File "/usr/lib/python3.6/inspect.py", line 2169, in _signature_from_callable
 return _signature_bound_method(sig)
 File "/usr/lib/python3.6/inspect.py", line 1759, in _signature_bound_method
 raise ValueError('invalid method signature')
ValueError: invalid method signature