How to generate filename appropiate to the list assigned "years"

How to generate filename appropiate to the list assigned "years"

How to generate filename appropiate to the list assigned "years". I need
to know how to generate the "calendar" name appropiate to the year_list. I
want to add 2000 to 2013 year_list at once, because right now I have to
edit and change every year number once I run the script to output
different year.
year_list = [2000]
FILENAME = "calendar_2000.txt"
What I need is year_list to be 2000, 2001, 2002.. up to 2013 and the
output file to be generated accordingly to the year_list numbers.