python可以通过ChromeOptions设置chrome参数，如下载路径等，代码如下(python 3.6.7)：
#-*-coding=utf-8-*-
from selenium import webdriver
import time
def set_chrome_pref():
chromeOptions = webdriver.ChromeOptions()
prefs = {"download.default_directory":"D:\\"}
chromeOptions.add_experimental_option("prefs", prefs)
driver = webdriver.Chrome(chrome_options=chromeOptions)
time.sleep(10)