from gpiozero import Button
from time import sleep

aBtn = Button(6)
bBtn = Button(13, pull_up=False)

def buTest(but):
    sleep(0.5) #adjust to your liking
    act = but.is_active
    if act:
        # long press action here
        print('Button {} long press'.format(str(but.pin)))
    else:
        #short press action here
        print('Button {} short press'.format(str(but.pin)))

aBtn.when_pressed = buTest
bBtn.when_pressed = buTest