Output question f = ((0,))

Question

Hello, completely lost on this one too:(.
"f = ((0,))
f = f + 2 * (2,)
print f
Solution: (0,2,2)"
The way I see it, f=0, so 0+2*(2,). But it's not asking for a solution? But even then, shouldn't it be f= 0, 2, 4 (2*2=4)?
Thanks for any help.

Answer 1

Here f= (0,), it igones extra parentheses if it's empty.
Now, + operator between 2 tuples concatenates them and * operator when applied on a tuple, fills the tuple with what it already has, multiple times.
ex: a=(1, 2)
then, 2*a= (1,2,1,2)
In this case, f= f+ 2*(2,)
f= (0,) + (2,2)
f= (0,2,2)