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from selenium import webdriver
from time import sleep
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.support.select import Select#Select 模块(index)
driver=webdriver.Firefox()
driver.get('http://www.baidu.com')
#鼠标移动到'设置'按钮
mouse=driver.find_element_by_class_name('pf')
print(mouse)
ActionChains(driver).move_to_element(mouse).perform()
sleep(2)
driver.find_element_by_class_name('setpref').click()
#分两步：先定位下拉框，再点击选项
# s=driver.find_element_by_id('nr')
# s.find_element_by_xpath("//option[@value='50']").click()
#Select 模块(index),直接定位下拉框
s=driver.find_element_by_id('nr')
Select(s).select_by_index(2)

# coding:utf-8
from selenium import webdriver
from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.support.select import Select
driver = webdriver.Firefox()
url = "https://www.baidu.com"
driver.get(url)
driver.implicitly_wait(20)
# 鼠标移动到“设置”按钮
mouse = driver.find_element_by_link_text("设置")
ActionChains(driver).move_to_element(mouse).perform()
driver.find_element_by_link_text("搜索设置").click()
# 通过 text:select_by_visible_text()
s = driver.find_element_by_id("nr")
Select(s).select_by_visible_text("每页显示 50 条")
# # 分两步：先定位下拉框，再点击选项
# s = driver.find_element_by_id("nr")
# s.find_element_by_xpath("//option[@value='50']").click()
# # 另外一种写法
#
driver.find_element_by_id("nr").find_element_by_xpath("//option[@valu
e='50']").click()
# # 直接通过 xpath 定位
# driver.find_element_by_xpath(".//*[@id='nr']/option[2]").click()
# # 通过索引：select_by_index()
# s = driver.find_element_by_id("nr")
# Select(s).select_by_index(2)
# # 通过 value：select_by_value()
# s = driver.find_element_by_id("nr")
# Select(s).select_by_value("20")
Selenium100 例（上海-悠