led_annotated.py

#import the LED object from the gpiozero module
from gpiozero import LED
#import the 'sleep' function from the time module
from time import sleep

#Create a new instance of the LED class, with the parameter '20'
redLed = LED(20)

#Call the 'on' method of the redLed instance, which is given no arguments
redLed.on()

#call the 'sleep' function that we imported from the time module.
#Notice the lack of a a period or dot - this is just a regular old
#Function that we're calling, not the method of an object
sleep(1)

#call the off  method of the redLed object, again with no arguments
redLed.off()

sleep(1)

#call the 'blink' method of the redLed object, this time with two arguments
#These are both keyword arguments
redLed.blink(on_time=.2,off_time=.8)

sleep(5)

redLed.off()