from servo import Servo
import time

motor=Servo(pin=15) 
motor.move(0) # servo  0°
time.sleep(0.5)
motor.move(90) # servo  90°
time.sleep(0.5)
motor.move(180) # servo  180°
time.sleep(0.5)
motor.move(90) # servo  90°
time.sleep(0.5)
motor.move(0) # servo 0°
time.sleep(0.5)