Python 动态获取页面元素

from selenium.webdriver.common.by import By 
from selenium.webdriver.support.ui import WebDriverWait 
from selenium.webdriver.support import expected_conditions as EC

next_page=WebDriverWait(driver, 10).until(EC.element_to_be_clickable((By.CSS_SELECTOR, "#b_results > li.b_pag > nav > ul > li:last-child")))
next_page.click()