def distance:
    from __future__ import print_function
    import time
    import RPi.GPIO as GPIO
    def measure():
      GPIO.output(GPIO_TRIGGER, True)
      time.sleep(0.00001)
      GPIO.output(GPIO_TRIGGER, False)
      start = time.time()
      while GPIO.input(GPIO_ECHO)==0:
        start = time.time()
      while GPIO.input(GPIO_ECHO)==1:
        stop = time.time()
      elapsed = stop-start
      distance = (elapsed * speedSound)/2
      return distance
    def measure_average():
      distance1=measure()
      time.sleep(0.1)
      distance2=measure()
      time.sleep(0.1)
      distance3=measure()
      distance = (distance1 + distance2 + distance3)/3
      return distance
      GPIO.setmode(GPIO.BCM)
    GPIO_TRIGGER = 23
    GPIO_ECHO    = 24
    temperature = 20
    speedSound = 33100 + (0.6*temperature)
    print("Ultrasonic Measurement")
    print("Speed of sound is",speedSound/100,"m/s at ",temperature,"deg")
    GPIO.setup(GPIO_TRIGGER,GPIO.OUT)  # Trigger
    GPIO.setup(GPIO_ECHO,GPIO.IN)      # Echo
    GPIO.output(GPIO_TRIGGER, False)
    time.sleep(0.5)
    try:
      while True:
        distance = measure_average()
        print("Distance : {0:5.1f}".format(distance))
        time.sleep(1)
    except KeyboardInterrupt:
      GPIO.cleanup()

https://www.domo-blog.fr/capteur-de-distance-sur-raspberry/

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