How to use a variable as part of a filename

[handyguy]

I would like to simplify the following code, replacing the multiple if/elif's with a single line, but I have not been able to successfully figure it out.

def print_time():
    now = datetime.datetime.now()
    hour = now.hour
    minute = now.minute
    second = now.second
    if hour == 1:
        command = 'echo 0 | fbink -i 1.png -g x=100 -c'
    elif hour == 2:
        command = 'echo 0 | fbink -i 2.png -g x=100 -c'
    elif hour == 3:
        command = 'echo 0 | fbink -i 3.png -g x=100 -c'
    elif hour == 4:
        command = 'echo 0 | fbink -i 4.png -g x=100 -c'
    elif hour == 5:
        command = 'echo 0 | fbink -i 5.png -g x=100 -c'
    elif hour ==6:
        command = 'echo 0 | fbink -i 6.png -g x=100 -c'
#   etc...        
    os.system(command)

Any help is much appreciated!