Programming the onboard LEDs (activity and power lights) with GPIO Zero

onboard_leds.py

from gpiozero import LED
from time import sleep
from signal import pause

red = LED(35)
green = LED(47)

def blink(n):
    red.blink(n, n)
    sleep(n)
    green.blink(n)

blink()

pause()

onboard_leds_pwm.py

from gpiozero import PWMLED
from time import sleep

red = PWMLED(35)
green = PWMLED(47)

def opp():
    while True:
        yield 1 - red.value

green.source = opp()

while True:
    for i in range(11):
        red.value = i / 10
        sleep(0.05)
    for i in reversed(range(11)):
        red.value = i / 10
        sleep(0.05)