1_led.py

from gpiozero import LED
from time import sleep

led = LED(17)

while True:
    led.on()
    sleep(1)
    led.off()
    sleep(1)

2_blink.py

from gpiozero import LED

led = LED(17)

led.blink()

3_camera.py

from picamera import PiCamera
from time import sleep

camera = PiCamera()

camera.start_preview()
sleep(10)
camera.capture('/home/pi/image.jpg')
camera.stop_preview()

4_sense.py

from sense_hat import SenseHat

sense = SenseHat()

while True:
    r = 255 * sense.humidity / 100
    sense.clear(r, 0, 0)

5_led_button_1.py

from gpiozero import LED, Button

led = LED(17)
button = Button(2)

while True:
    if button.is_pressed:
        led.on()
    else:
        led.off()

6_led_button_2.py

from gpiozero import LED, Button

led = LED(17)
button = Button(2)

button.when_pressed = led.on
button.when_released = led.off

7_led_button_3.py

from gpiozero import LED, Button

led = LED(17)
button = Button(2)

led.source = button.values