Не записываются файлы python3

Есть код, мне нужно сделать запись файла в документ, но она не проходит(Ниже конкретный код записи в файл)

from selenium import webdriver
from selenium.webdriver.common.keys import Keys
from us_data import  username, password
import time
import random

class InstagramBot():
    def __init__(self, USERNAME, PASSWORD):
        self.username = USERNAME
        self.password = PASSWORD
        self.browser = webdriver.Chrome(executable_path="chromedriver/chromedriver.exe")

    def close_browser(self):
        self.browser.close()
        self.browser.quit()

    def login(self):
        browser = self.browser
        browser.get('https://www.instagram.com')
        time.sleep(random.randrange(3, 5))

        username_input = browser.find_element_by_name('username')
        username_input.clear()
        username_input.send_keys(username)

        time.sleep(2)

        password_input = browser.find_element_by_name('password')
        password_input.clear()
        password_input.send_keys(password)

        password_input.send_keys(Keys.ENTER)

        time.sleep(10)

    def like_photo_by_hashtag(self, hashtag):
        browser = self.browser
        browser.get(f'https://www.instagram.com/explore/tags/{hashtag}/')
        time.sleep(5)

        for i in range(1, 4):
            browser.execute_script('window.scrollTo(0, document.body.scrollHeight);')
            time.sleep((random.randrange(3, 5)))

        hrefs = browser.find_elements_by_tag_name('a')

        posts_urls = []

        for item in hrefs:
            href = item.get_attribute('href')

            if '/p/' in href:
                posts_urls.append(href)
                print(posts_urls)

        for url in posts_urls[0:1]:
            try:
                browser.get(url)

                like_button = browser.find_element_by_class_name('fr66n').click()
                time.sleep(10)

                browser.close()
                browser.quit()

            except Exception as ex:
                print(ex)
                self.close_browser()

    def xpath_exist(self, url):

        browser = self.browser
        try:
            browser.find_element_by_xpath(url)
            exist = True
        except Exception:
            exist = False
        return exist

    def put_exactly_like(self, userpost):
        browser = self.browser

        browser.get(userpost)
        time.sleep(4)

        wrong_userpage = '/html/body/div[1]/section/main/div/h2'

        if self.xpath_exist(wrong_userpage):
            print('Вы ошиблись, такого поста не существует')
            self.close_browser()
        else:
            print('Пост найден - лайк')
            time.sleep(2)
            like_button = 'fr66n'
            browser.find_element_by_class_name(like_button).click()

    def put_many_likes(self, userpage):
        browser = self.browser
        browser.get(userpage)
        time.sleep(2)

        wrong_userpage = '/html/body/div[1]/section/main/div/h2'

        if self.xpath_exist(wrong_userpage):
            print('Вы ошиблись, такого поользователя не существует')
            self.close_browser()
        else:
            print('Пользователь найден - лайк')
            time.sleep(2)
            posts_count = int(browser.find_element_by_xpath('/html/body/div[1]/section/main/div/header/section/ul/li[1]/span/span').text)
            loops_count = int(posts_count / 12)
            print(loops_count)

            post_url = []
            for i in range(0, loops_count):
                hrefs = browser.find_elements_by_tag_name('a')
                hrefs = [item.get_attribute('href') for item in hrefs if "/p/" in item.get_attribute('href')]

                for href in hrefs:
                    post_url.append(href)

                browser.execute_script("window.scrollTo(0, document.body.scrollHeight);")
                time.sleep(random.randrange(2, 4))
                print(f"Итерация #{i}")

                file_name = userpage.split("/")[-2]

                with open(f'{file_name}.txt', 'a') as file:
                    for posts_urls in post_url:
                        file.write(posts_urls + "\n")
                        file.close()

            self.close_browser()



bot = InstagramBot(username,password)
bot.login()
bot.put_many_likes('https://www.instagram.com/elric180/')

КОд записи в файл:

file_name = userpage.split("/")[-2]

                with open(f'{file_name}.txt', 'a') as file:
                    for posts_urls in post_url:
                        file.write(posts_urls + "\n")
                        file.close()