phantomsjsをちゃんと葬る

from selenium.webdriver.phantomjs.webdriver import RemoteWebDriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities


class WebDriver(RemoteWebDriver):
    def __init__(self, executable_path="phantomjs",
                 port=0, desired_capabilities=DesiredCapabilities.PHANTOMJS,
                 service_args=None, service_log_path=None):

        super(WebDriver, self).__init__(
            command_executor='http://127.0.0.1:8910/wd/hub',
            desired_capabilities=DesiredCapabilities.PHANTOMJS,
        )

    def quit(self):
        self.command_executor._request(
            'GET', '{}/shutdown'.format(self.command_executor._url), 'shutdown')

driver = WebDriver()
driver.quit()