selenium web端滑动页面查找元素

滑动页面查找元素 每次加 300 进度条，总共2次机会

# -*- coding:utf-8 -*-
from selenium import webdriver
from time import sleep
from selenium.common.exceptions import NoSuchElementException

driver = webdriver.Chrome(executable_path="chromedriver.exe")
driver.maximize_window()
driver.get("http://news.baidu.com/")


def scroll_find_element(css_element):
    """滑动查找元素 找到就退出,
    没找到就再从头开始找一次"""
    scroll = 0
    loop = 0
    while loop <=1:
        try:
            driver.find_element_by_css_selector(css_element)
        except NoSuchElementException:
            sleep(0.5)
            js = "document.documentElement.scrollTop={0}".format(scroll)
            driver.execute_script(js)
            scroll += 300
        else:
            print("找到元素")
            break
        if scroll > 6000:
            loop += 1
            scroll = 0
            print("没找到元素 第%s次" %loop)

if __name__ == '__main__':
    scroll_find_element("#star-aside > div.hd > h3")
    # scroll_find_element("#star-aside > div.hd > h3 lll")