No. (assuming you are asking about the keyword argument digits that is used in the round function). I have edited the comments above to make it clearer.
No. (assuming you are asking about the assignment to fractional_digits). 
No. (assuming you are asking about the keyword argument digits that is used in the round function). I have edited the comments above to make it clearer.
No. (assuming you are asking about the assignment to fractional_digits).