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.signature also handles wrapped functions better.
>>> def deco(f):
 import functools
 @functools.wraps(f)
 def ret(*args, **kw):
 return f(*args, **kw)
 return ret
>>> @deco
def f(n, k):
 return n + k*2
>>> import inspect as ip
>>> isf=ip.signature(f)
>>> print(isf)
(n, k)
>>> ip.formatargspec(*ip.getfullargspec(f))
'(*args, **kw)'