下载文件.py

from selenium import webdriver
import os
fp = webdriver.FirefoxProfile()
#保存到指定目录：
fp.set_preference("browser.download.folderList",2)

#是否显示开始、True为显示、false为不显示、
fp.set_preference("browser.download.manager.showWhenStarting",False)

#指定下载的目录、os.getcwd()返回当期目录、
fp.set_preference("browser.download.dir",os.getcwd())

#application/octet-stream为文件类型
fp.set_preference("browser.helperApps.neverAsk.saveToDisk","application/octet-stream")
driver = webdriver.Firefox(firefox_profile=fp)
driver.get("http://pypi.Python.org/pypi/selenium")
driver.find_element_by_partial_link_text("selenium-2").click()