<a class="paging">上一页</div>
<a class="paging">1</div>
<a class="paging">2</div>
<a class="paging">下一页</div>

page_next = driver.find_element(By.XPATH, '//a[text()="下一页")]')

page_next = driver.find_element(By.XPATH, '//a[contains(text(), "下一页")]')

page_next = driver.find_element(By.XPATH, '//a[contains(string(), "下一页")]')

#coding:utf-8
from selenium import webdriver
import time
url ='http://www.baidu.com'
driver = webdriver.Chrome()
driver.get(url)
time.sleep(1)
e=driver.find_element_by_xpath('//*[@id="lg"]/img')
print e
print e.text
print e.id
print e.tag_name
print type(e)
time.sleep(1)
driver.quit()