what is this (x,*a) and (x,**a)?

Question

if i make def like this

def name (x,*a)
or
def name (x,**a)

what this "stars" do ?

Answer 1

It's a notation for packing/unpacking arguments:

single '*' pack arguments in a list, while double '**' pack named arguments in a dict...

http://hangar.runway7.net/JUMP_LINK__&&__python__&&__JUMP_LINK/packing-unpacking-arguments

Answer 2

thank you