1.安装selenium 

pip install -U selenium

2.安装并安装geckodriver

https://github.com/mozilla/geckodriver/releases/tag/v0.26.0

解压到环境变量能找得到的地方 

# coding = utf-8 
from selenium import webdriver 
from selenium.webdriver.firefox.firefox_binary import FirefoxBinary

#browser = webdriver.Firefox() 
binary =FirefoxBinary('C:\\Program Files\\Mozilla Firefox\\firefox.exe')

browser =webdriver.Firefox(firefox_binary=binary)
 
browser.get("http://www.baidu.com")
 
browser.find_element_by_id("kw").send_keys("selenium") 
browser.find_element_by_id("su").click() 

browser.quit()