python selenium 点击表格中的一系列按钮并输出弹窗内容到csv

一个python selenium的实用实例，比demo重，但也不算太复杂。
trick总结如下：

最新chromedriver的地址，https://googlechromelabs.github.io/chrome-for-testing，这很重要，不然就要处理chrome自动更新之类的烦人问题。很多下载来源都有点过时。
用options配置webdriver的地址，以及socks5代理。
driver.page_source可以打印当前html，可以辅助判断执行进度。
XPath (XML Path Language) 是一门在 XML 文档中通过元素和属性进行导航的语言，属于w3c标准。HTML是标准的XML，所以HTML也可以使用XPath。XPATH选择器的发挥比较稳定。
python有个traceback模块，print(traceback.format_exc())可以原样raise exception的同时，忽略exception。

爬虫项目，遇到了element not interactable，可能是尝试点击的时候元素还未可见。
解决办法就是在 until.elementLocated 之后再添加一个 until.elementIsVisible 的判断。
我这的原因是，网页没有做页面适配，如果窗口太小，按钮是看不见的。所以治本的解决方案是把窗口最大化，上面的判断只能起到问题诊断的作用而非治疗作用。
把sleep都换成until，优雅一点。

# 如果前端页面改了的话，需要修改相应xpath，页面改动大的话需要修改代码

import selenium.common.exceptions
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.support.wait import WebDriverWait
# 根据网页标题、网址以及元素是否存在/可见/可点击等条件来决定我们是否需要继续等待
from selenium.webdriver.support import expected_conditions as EC
import configparser
import csv


class Spider:
    def __init__(self):
        self.config = configparser.ConfigParser()
        self.config.read('config.ini')

        options = Options()
        options.binary_location = self.config['envs']['chrome_driver_location']
        options.add_argument('--proxy-server=' + self.config['envs']['proxy'])
        options.add_argument('--start-maximized')
        self.driver = webdriver.Chrome(options)

    def request(self, url):
        self.driver.get(url)

    def test_page(self):
        print(self.driver.page_source)

    def login(self):
        wait = WebDriverWait(self.driver, 10)

        username = self.config['envs']['username']
        password = self.config['envs']['password']
        xpath_username = self.config['xpath']['username_input']
        xpath_password = self.config['xpath']['password_input']
        xpath_login = self.config['xpath']['login_button']

        username_input = wait.until(EC.presence_of_element_located((By.XPATH, xpath_username)))
        password_input = wait.until(EC.presence_of_element_located((By.XPATH, xpath_password)))
        username_input.send_keys(username)
        password_input.send_keys(password)
        signin_button = self.driver.find_element(By.XPATH, xpath_login)
        signin_button.click()

    def close(self):
        self.driver.quit()

    def export_running_job(self):
        login = False
        wait = WebDriverWait(self.driver, 10)
        xpath_table = self.config['xpath']['table_body']
        xpath_template = self.config['xpath']['detail_button']
        xpath_groupid = self.config['xpath']['groupid_input']
        xpath_topiclist = self.config['xpath']['topiclist_pre']
        xpath_next = self.config['frontend']['next_button']
        xpath_close = self.config['xpath']['close_button']
        for key in self.config['urls']:
            url_login = self.config['login'][key]
            url_flink = self.config['urls'][key]
            if not login:
                self.request(url_login)
                self.login()
                login = True
            self.request(url_flink)
            self.driver.maximize_window()
            # print(xpath_template)

            rows = wait.until(EC.presence_of_all_elements_located((By.XPATH, xpath_table)))
            groupid_ls, topic_ls = [], []
            while True:
                segments = xpath_template.split('/')
                for i in range(1, len(rows) + 1):
                    segments[-3] = 'tr[' + str(i) + ']'
                    xpath_item = '/'.join(segments)
                    # print(xpath_item)
                    detail_button = wait.until(EC.visibility_of_element_located((By.XPATH, xpath_item)))
                    detail_button.click()
                    groupid = wait.until(EC.presence_of_element_located((By.XPATH, xpath_groupid)))
                    self.driver.execute_script("arguments[0].removeAttribute('disabled')", groupid)
                    groupid_ls.append(groupid.get_attribute("value"))
                    topiclist = wait.until(EC.presence_of_element_located((By.XPATH, xpath_topiclist)))
                    topic_ls.append(topiclist.get_attribute("innerHTML"))
                    close_button = wait.until(EC.visibility_of_element_located((By.XPATH, xpath_close)))
                    close_button.click()
                if len(rows) == int(self.config['frontend']['table_maxsize']):
                    next_button = self.driver.find_element(By.XPATH, xpath_next)
                    next_button.click()
                else:
                    break
            with open(key+'.csv', 'wt') as f:
                cw = csv.writer(f, lineterminator='\n')
                for i in range(len(groupid_ls)):
                    cw.writerow([groupid_ls[i], topic_ls[i]])

        self.close()


if __name__ == '__main__':
    spider = Spider()
    spider.export_running_job()