<input type="text" name="user-name" id="passwd-id" />

# 获取id标签值
element = driver.find_element_by_id("passwd-id")
# 获取name标签值
element = driver.find_element_by_name("user-name")
# 获取标签名值
element = driver.find_elements_by_tag_name("input")
# 也可以通过XPath来匹配    推荐使用
element = driver.find_element_by_xpath("//input[@id='passwd-id']")

from selenium import webdriver
from lxml import etree
from selenium.common.exceptions import TimeoutException

# 设置chromedriver的路径
driver_path = r"你的chromedriver.exe位置"

# 启用chromedriver(声明浏览器对象)
driver = webdriver.Chrome(executable_path=driver_path)

#简单的先进入百度首页
driver.get('https://www.baidu.com/')
#设置打开浏览器的宽高
driver.set_window_size(1500, 1000)

# 页面缓冲时间（隐式等待）怕网不好的时候加载慢，导致后续抓取网页代码不全-->属于笨方法，不智能
driver.implicitly_wait(3)

# 页面缓冲时间(显示等待-->智能)，先try以下，不行就等等再try
try:
    element = WebDriverWait(driver, 5).until(
        EC.presence_of_element_located((By.ID, 'kwssss'))
    )
    print(element)
except TimeoutException as ex:
    print(ex)
#抓取网页源码
html = etree.HTML(driver.page_source)
# 百度测试   抓取输入框，send_keys是在input里输入内容然后等待三秒钟再清空
# inputTag = driver.find_element_by_id('kw')
# inputTag = driver.find_element_by_name('wd')
# inputTag = driver.find_element_by_class_name('s_ipt')
inputTag = driver.find_element(By.ID, 'kw')
inputTag.send_keys('python')
time.sleep(3)
inputTag.clear()
#也可以不清空，抓取搜索按钮，点击搜索实践
# submitBtn = driver.find_element(By.ID, 'su')
# submitBtn =driver.find_element_by_xpath("//*[@id='su']")
# submitBtn.click()

# selenium行为链测试
inputTag = driver.find_element_by_id('kw')   #根据ID抓取元素
submitBtn = driver.find_element(By.ID, 'su')
actions = ActionChains(driver)   #调用行为连
actions.move_to_element(inputTag)   #将鼠标移动过去
actions.send_keys_to_element(inputTag, 'Python')   #向里面填数据
actions.move_to_element(submitBtn)    #鼠标移动到搜索按钮上
actions.click(submitBtn)   #点击
actions.perform()   #行为链启动，否则上边不执行

#根据Xpath语法
html.xpath("Xpath路径/text()")