https://en.wikipedia.org/wiki/Raspberry_Pi

3V3 3.3 volts Anything connected to these pins will always get 3.3V of power5V 5 volts Anything connected to these pins will always get 5V of powerGND ground Zero volts, used to complete a circuitGP2 GPIO pin 2 These pins are for general-purpose use and can be configured as input or output pinsID_SC/ID_SD/DNC Special purpose pins

https://www.raspberrypi.org/learning/physical-computing-with-python/requirements/

from gpiozero import LEDfrom time import sleep

led = LED(17)

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