Variable length variable / Keyword variable length variable

asta.py

def func(a,b=10,*c,**d):
    print(a,b,c,d)

func(1,20,30,40)
func([1,20,30,40])
func({'a':1,'b':20,'c':30,'d':40})
func(*[1,20,30,40])
func(**{'a':1,'b':20,'c':30,'d':40})

a = {1:10,2:20}
b = {3:30,4:40}

print({**a,**b})

$ python --version
Python 3.5.0
$ python asta.py 
1 20 (30, 40) {}
[1, 20, 30, 40] 10 () {}
{'c': 30, 'b': 20, 'd': 40, 'a': 1} 10 () {}
1 20 (30, 40) {}
1 20 () {'c': 30, 'd': 40}
{1: 10, 2: 20, 3: 30, 4: 40}