need help with ultrasonic sensor code

[mpmm366]

Hello guys. On my raspberry pi I have a hc-sr04 ultrasonic sensor, now I want to run a sh script, when the sensor measurement is below 10cm. Here is my Code, but it doesnt work. It only executes the code when I press ctrl c. PS Iam new to python

#!/usr/bin/env python

import time
import RPi.GPIO as GPIO
import os

GPIOTrigger = 23
GPIOEcho    = 24



def MesseDistanz():
    
    GPIO.output(GPIOTrigger, True)

    
    time.sleep(0.00001)

    
    GPIO.output(GPIOTrigger, False)

    
    StartZeit = time.time()
    StopZeit = StartZeit

    
    while GPIO.input(GPIOEcho) == 0:
        StartZeit = time.time()

   
    while GPIO.input(GPIOEcho) == 1:
        StopZeit = time.time()

    
    SignalLaufzeit = StopZeit - StartZeit
    Distanz = (SignalLaufzeit/2) * 34350

    return [Distanz, (SignalLaufzeit*1000/2)]



def main():


    try:
        while True:
            Ergebnis = MesseDistanz()
            print("Gemessene Entfernung: %.1f cm (Signallaufzeit: %.4fms)" % (Ergebnis[0], Ergebnis[1]))
            time.sleep(1)

   
    except KeyboardInterrupt:
        print("Messung abgebrochen")
        GPIO.cleanup()

if __name__ == '__main__':
    
    GPIO.setmode(GPIO.BCM)

    
    GPIO.setup(GPIOTrigger, GPIO.OUT)
    GPIO.setup(GPIOEcho, GPIO.IN)

    
    GPIO.output(GPIOTrigger, False)

   
    main()


if 0 < 10:
	os.system('. /home/pi/test.sh')