python selenium right click on an href and choose Save link as... on Chrome.

From:https://stackoverflow.com/questions/42781483/right-click-on-an-href-and-choose-save-link-as-in-python-selenium/42783015
原生代码：
from selenium import webdriver
from selenium.webdriver import ActionChains
import pyautogui
driver = webdriver.Chrome()
driver.get(link)
elem = driver.find_element_by_css_selector('a[target="_blank"]')
actionChain = ActionChains(driver)
actionChain.context_click(elem).perform()
pyautogui.typewrite(['down','down','down','down','enter'])

我的代码：

def test_bzw_install(self):
    __download_arrow = (By.CLASS_NAME, 'glyphicon-arrow-right')
    __bluezone_web_build_logo = (By.CLASS_NAME, 'no-text-decoration')
    """1.Download latest build from bzw Build web site(http://10.17.10.130/bzw) to local"""
    """1.1.Open Build web site(http://10.17.10.130/bzw)"""
    self.driver = BaseWebDriver().getDriver(Global().browser)
    self.build_page = BzwInstall(self.driver)
    self.build_page.go_to()
    # """1.2(PlanA).Click Master Download Arrow to download-Pass"""
    self.ele_visible_short(self.__bluezone_web_build_logo)
    elem_download_arrow = self.get_elements(*self.__download_arrow)[0]
    actionChain = ActionChains(self.driver)
    actionChain.context_click(elem_download_arrow).perform()
    pyautogui.typewrite(['down', 'down', 'down', 'down', 'enter'])