Python with Webdriver - launch Firefox and Chrome browser

def setUp_and_login(browser):
        '''
        Supported browsers are: firefox; chrome
        '''
        #
        if browser == 'firefox':
            driver = webdriver.Firefox()
        elif browser == 'chrome':
            driver = webdriver.Chrome('Location of Chromedriver utility')
        else:
            print('')
            print('Browser not recognized, exiting...')
            print('')
            exit()