Is it possible to set a default value for a variable argument list in Python 3?

Something like:

def do_it(*args=(2, 5, 21)):pass

I wonder that a variable argument list is of type tuple but no tuple is accepted here.

If not syntactically, then depending on what behavior you want:

def do_it(*args):if not args: args = (2, 5, 21)

or

def do_it(a=2, b=5, c=21, *args):args = (a,b,c)+args

should do it.