selenium模块及类组织关系

问题：webdriver子模块中为什么可以直接使用类Chrome、ChromeOptions、Firefox、FirefoxProfile...

在webdriver的__init__.py文件中已经从.firefox.webdriver 导入了 WebDriver并重新命名为Chrome、Firefox、Ie...

所以可以直接使用

# webdriver子模块的__init__.py文件
from .firefox.webdriver import WebDriver as Firefox  # noqa
from .firefox.firefox_profile import FirefoxProfile  # noqa
from .firefox.options import Options as FirefoxOptions  # noqa
from .chrome.webdriver import WebDriver as Chrome  # noqa
from .chrome.options import Options as ChromeOptions  # noqa
from .ie.webdriver import WebDriver as Ie  # noqa
from .ie.options import Options as IeOptions  # noqa
from .edge.webdriver import WebDriver as Edge  # noqa
from .opera.webdriver import WebDriver as Opera  # noqa
from .safari.webdriver import WebDriver as Safari  # noqa
from .blackberry.webdriver import WebDriver as BlackBerry  # noqa
from .phantomjs.webdriver import WebDriver as PhantomJS  # noqa
from .android.webdriver import WebDriver as Android  # noqa
from .webkitgtk.webdriver import WebDriver as WebKitGTK # noqa
from .webkitgtk.options import Options as WebKitGTKOptions # noqa
from .remote.webdriver import WebDriver as Remote  # noqa
from .common.desired_capabilities import DesiredCapabilities  # noqa
from .common.action_chains import ActionChains  # noqa
from .common.touch_actions import TouchActions  # noqa
from .common.proxy import Proxy  # noqa