RPi_SSH_Toggle.py

import os
import time
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)

OldPinStatus = None
while True:
    PinStatus = GPIO.input(18)
    if OldPinStatus != PinStatus:
        if PinStatus:
            os.system("sudo service ssh start")
        else:
            os.system("sudo service ssh stop")
        OldPinStatus = PinStatus
    time.sleep(0.1)