键盘事件：

from selenium import webdriver
import time
from selenium.webdriver.common.keys import Keys
driver = webdriver.Firefox()
driver.get("https://www.sina.com.cn/")
#找到搜索框：
s = driver.find_element_by_class_name("inp-txt")
time.sleep(1)
s.clear()
s.send_keys("python")
s.clear()
s.send_keys("python1")
#退格：
s.send_keys(Keys.BACKSPACE)
#全选：
s.send_keys(Keys.CONTROL,"a")
#剪切：
s.send_keys(Keys.CONTROL,"x")
#粘贴：
s.send_keys(Keys.CONTROL,"v")