When you finish the script with "Ctrl + C" (KeyboardInterrupt) it does not close Selenium or Firefox

I'm using selenium to handle a page, while running the script it opens firefox, but what I wanted to do is the following, if any problem occurs in the script or if the user terminates, I want the firefox to close as well.

I tried several things like:

Use exit:

def __exit__(self):
    self.fechaAba()

Ou or the:

def __del__(self):
    self.fechaAba()

The function I am using is this, it is working, I use it in exceptions to close firefox when the error occurs.

def fechaAba(self):
    try:
        self.__driver.driver.close()
    except:
        setLog("Firefox ja finalizado")

But for example if I press Ctrl + C to finish the script it does not close firefox, the closest I got was using atexit:

import atexit

    def __init__(self):
        atexit.register(self.exit_handler)

    def exit_handler(self):
        self.fechaAba()

It displays the message "Firefox is already finished", but firefox is still open:

KeyboardInterrupt

[2017-09-28 15:16:41]: Firefox ja finalizado

[2017-09-28 15:16:42]: Firefox ja finalizado

When I use the driver.close () it enters the exception and displays the message "Firefox is already finalized", ie it could not execute the command, and when I use quit the effect is similar, it normally executes quit (It does not go into the exception), but firefox remains open.

I gave a small example:

from selenium import webdriver
import time
import atexit

class WhatsappAPI(object):

    driver = None

    def __init__(self):
        print "__init__"
        atexit.register(self.exit_handler)
        self.driver = webdriver.Firefox()
        self.driver.get("http://web.whatsapp.com")

    def comeca_acao(self):
        while True:
            time.sleep(10)
            print "ok"

    def exit_handler(self):
        print "exit_handler"
        self.driver.quit()

    def __exit__(self):
        print "__exit__"
        self.driver.quit()

    def __del__(self):
        print "__del__"
        self.driver.quit()


w = WhatsappAPI()
w.comeca_acao()

Result:

teste.py
__init__
Traceback (most recent call last):
  File "C:\Users\Futurotec\Documents\futurofone_chat\branch\v3.12\_externo\WhatsappBot - Instalador\Final\WhatsappWebAPI\teste.py", line 34, in <module>
    w.comeca_acao()
  File "C:\Users\Futurotec\Documents\futurofone_chat\branch\v3.12\_externo\WhatsappBot - Instalador\Final\WhatsappWebAPI\teste.py", line 17, in comeca_acao
    time.sleep(10)
KeyboardInterrupt
exit_handler
__del__

When it appears in terminal " __init__ " it opens firefox, when I press ctrl c and firefox is still open, what I want is for firefox to close ctrl c or when it enters any exception. In the exceptions already works, but when I press ctrl c no.