Python 2.7 + Selenium 3.8 + Firefox 57 + MacOS Sierra：设置＆＃34; browser.helperApps.neverAsk.openFile＆＃34;

Question

我在使用Selenium 3.8，Firefox 57和Python 2.7从网页下载PDF文件时遇到了困难。如果我没有从＆＃34;手动更改Firefox配置文件下载设置，请始终询问您保存文件的位置＆＃34;到特定位置，仍会出现下载弹出框，文件不会自动下载到指定文件夹。

我已经查看了this StackO帖子，我不确定我错过了什么。我是否需要安装和设置木偶？我确实已经设置了geckodriver可执行文件。

这是我的代码：

profile = webdriver.FirefoxProfile("/Users/USERNAME/Library/Application Support/Firefox/Profiles/NAME")
profile.set_preference('browser.download.folderList', 2) # custom location
profile.set_preference('browser.download.manager.showWhenStarting', False)
profile.set_preference("browser.helperApps.neverAsk.openFile", 'application/pdf')
profile.set_preference('browser.helperApps.neverAsk.saveToDisk', 'application/pdf')
profile.set_preference('browser.download.dir', download_to_location)
browser = webdriver.Firefox(profile)
download_to_location = "PATH_TO_FOLDER_WITHIN_DIRECTORY"

for race in races:
        browser.get(race)
        try:
            [browser.find_element_by_xpath(lxp).click() for lxp in download_from_xpaths]
        except: 
            pass

截图：

Answer 1

要自动将PDF文件下载到指定的文件夹，您可以使用以下代码块：

newpath = "PATH_TO_FOLDER_WITHIN_DIRECTORY"
if not os.path.exists(newpath):
    os.makedirs(newpath) 
profile = webdriver.FirefoxProfile("/Users/USERNAME/Library/Application Support/Firefox/Profiles/NAME")
profile.set_preference("browser.download.dir",newpath);
profile.set_preference("browser.download.folderList",2);
profile.set_preference("browser.helperApps.neverAsk.saveToDisk", "text/plain,application/octet-stream,application/pdf,application/x-pdf,application/vnd.pdf");
profile.set_preference("browser.download.manager.showWhenStarting",False);
profile.set_preference("browser.helperApps.neverAsk.openFile","text/plain,application/octet-stream,application/pdf,application/x-pdf,application/vnd.pdf");
profile.set_preference("browser.helperApps.alwaysAsk.force", False);
profile.set_preference("browser.download.manager.useWindow", False);
profile.set_preference("browser.download.manager.focusWhenStarting", False);
profile.set_preference("browser.helperApps.neverAsk.openFile", "");
profile.set_preference("browser.download.manager.alertOnEXEOpen", False);
profile.set_preference("browser.download.manager.showAlertOnComplete", False);
profile.set_preference("browser.download.manager.closeWhenDone", True);
profile.set_preference("pdfjs.disabled", True);
browser = webdriver.Firefox(profile)
browser.get('Provide_URL_here')