Windows XP , python 2.7
https://pypi.python.org/pypi
https://pypi.python.org/pypi/selenium/2.53.6
selenium-2.53.6-py2.py3-none-any.whl

cd D:\Python27\Scripts
pip install \selenium\selenium-2.53.6-py2.py3-none-any.whl

http://chromedriver.storage.googleapis.com/index.html
版本匹配问题: https://blog.csdn.net/huilan_same/article/details/51896672
selenium 2.53 -> chromedriver 2.20 <- Chrome v43-48

ie_test1.py

# -*- coding: utf-8 -*-
import os, time
from selenium import webdriver

ie_driver = os.path.abspath(r"D:\selenium\IEDriverServer.exe")
os.environ["webdriver.ie.IEDriverServer"]=ie_driver
driver = webdriver.Ie(ie_driver)

driver.get("https://www.sogou.com")
driver.find_element_by_id("query").send_keys("webdriver python")
driver.find_element_by_id("stb").click()

time.sleep(10)
driver.quit()

chm_test1.py

# -*- coding: utf-8 -*-
import os, time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

ch_driver=os.path.abspath(r"D:\selenium\chromedriver.exe")
os.environ["webdriver.chrome.driver"]=ch_driver
driver = webdriver.Chrome()

driver.get('https://www.sogou.com')
assert  u'搜狗' in driver.title

elem = driver.find_element_by_id("query")
elem.send_keys('selenium python' + Keys.RETURN)

time.sleep(10)
driver.quit()

fox_test1.py

# -*- coding: utf-8 -*-
import os, time
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

fx_driver=os.path.abspath(r"D:\selenium\geckodriver.exe")
os.environ["webdriver.gecko.driver"]=fx_driver
driver = webdriver.Firefox()

driver.get('https://www.sogou.com')
assert  u'搜狗' in driver.title

elem = driver.find_element_by_id("query")
elem.send_keys('selenium python' + Keys.RETURN)

time.sleep(10)
driver.quit()