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Hm... now I see that link is very misleading... it opens a blog post, and then only a few seconds later jumps to the comment. So now I'll paste the comment here, to avoid misunderstandings:
Python3.6.0 (now in 2017). I start IDLE, and write
>>> 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
>>> f(
And get a tooltip (*args, **kw) instead of (n, k). I guess this is a bug.