Setup inputs

inputs

GPIO.setup(r13,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(r39,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(r67,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(r72,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)

GPIO.setup(s38,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(s47,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(s68,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(s99,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)

GPIO.setup(button,GPIO.IN, pull_up_down = GPIO.PUD_DOWN)

inputs.py

for pin in [r13, r39, r67, r72, s38, s47, s68, s99, button]:
    GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

inputs.py uses a list of inputs to handle the repetition.