サイトの更新情報をLINEに通知したい

import csv
import os
import sys
import urllib.request

import time
import pandas as pd 
from selenium import webdriver
from selenium.webdriver import Chrome, ChromeOptions,Remote


LINE_TOKEN = "LINE_TOKEN"
LINE_NOTIFY_URL = 'LINE_NOTIFY_URL'


def main():

    save_file_path = 'save.csv'
    if not has_csv(save_file_path):
        create_csv(save_file_path)
    create_csv(save_file_path)
    past_content = read_csv(save_file_path)

    options = ChromeOptions()
    webdriver = Chrome(options=options)

    logging(webdriver)

    time.sleep(5)

    contents = scrape_contents_list(webdriver)


    update_contents = contents_diff(past_content, contents)
    output_csv(update_contents, save_file_path)

    if update_contents:
        send_to_line(update_contents)


def has_csv(file_path):
    return os.path.exists(file_path) and os.path.getsize(file_path) != 0


def create_csv(file_path):
    with open(file_path, 'w', newline='', encoding='utf-8-sig') as file:
        file.write('タイトル,更新日')


def read_csv(file_path):
    csv_list = pd.read_csv(file_path, header=None).values.tolist()
    return csv_list


def logging(webdriver):
    webdriver.get('サイトURL')


    webdriver.find_element_by_xpath('//*[@id="userId"]').send_keys("")
    webdriver.find_element_by_xpath('//*[@id="password"]').send_keys("")

    time.sleep(3)

    webdriver.find_element_by_xpath('//*[@id="loginButton"]').click()


def scrape_contents_list(webdriver):

    contents=[]
    for details in webdriver.find_elements_by_css_selector('selector'):
        date1 = details.find_element_by_css_selector('selector').text
        title1 = details.find_element_by_css_selector('selector').text
    for details in webdriver.find_elements_by_css_selector('selector'):
        date2 = details.find_element_by_css_selector('selector').text
        title2 = details.find_element_by_css_selector('selector').text

    contents.append([date1,title1,date2,title2])

    return contents   




def contents_diff(past_content, contents):
    return_contents = []
    for content in contents:
        if content not in past_content:
            return_contents.append(content)
    return return_contents


def output_csv(update_contents, file_path):
    with open(file_path, 'w', newline='', encoding='utf_8-sig') as file:
        writer = csv.writer(file)
        for row in update_contents:
            writer.writerow(row) 


def send_to_line(update_contents):
    method = "POST"
    headers = {"Authorization": "Bearer %s" % LINE_TOKEN}
    payload = {"message": update_contents}
    try:
        payload = urllib.parse.urlencode(payload).encode("utf-8")
        req = urllib.request.Request(
            url=LINE_NOTIFY_URL, data=payload, method=method, headers=headers)
        urllib.request.urlopen(req)
    except Exception as e:
        print ("Exception Error: ", e)
        sys.exit(1)




if __name__ == '__main__':
    main()    

def contents_diff(past_content, contents):
    return_contents = []
    for content in contents:
        if content not in past_content:
            return_contents.append(content)
    return return_contents