python+selenium基础篇，By定位元素

from selenium import webdriver
from time import sleep
from selenium.webdriver.common.by import By #导入By定位包

dr=webdriver.Firefox()
dr.get("https://www.baidu.com")
dr.find_element(By.ID,"kw").send_keys("python")#百度搜索框中1输入“python”
sleep(2)
dr.find_element_by_id("su").click()#点击搜索
sleep(2)
dr.find_element(By.CSS_SELECTOR,"#kw").clear()#清空搜索框
sleep(2)
dr.quit()