File: button_camera_2.py

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gpiozero 2.0.1-0.1
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from gpiozero import Button
from picamera import PiCamera
from datetime import datetime
from signal import pause

left_button = Button(2)
right_button = Button(3)
camera = PiCamera()

def capture():
    camera.capture(f'/home/pi/{datetime.now():%Y-%m-%d-%H-%M-%S}.jpg')

left_button.when_pressed = camera.start_preview
left_button.when_released = camera.stop_preview
right_button.when_pressed = capture

pause()