Python. Parsing problem. What is the problem?

Question

Python

Strange situation with BeautifulSoup
I'm trying to find tags using the finaAll() method, but I'm getting the following situations:

• I get a list with names, while lists with prices and dates are empty
  

• I get a list with prices and date, while the names are empty
  

• I get empty lists
  

One excludes the other, and no matter how many times I run the program, the result is different. At the same time, I tried to output html code to the console, searched for all the tags, and they are in place, and the lists can be whatever they want.
What kind of nonsense, smart people?)

import requests
from bs4 import BeautifulSoup

class Parse:
    def __init__(self, url):

        self.link = url
        self.html = Parse.__get_html(self.link) # получаем html-страницу

    def __get_html(link):
        headers = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36'
                }
        req = requests.get(link, headers = headers)
        return req.text

    # Следующие методы ищут в собранной html-странице теги, содержащие называния, цены и даты, а затем собирают 
    # их в список и возвращают этот список
    def get_title(self):
        html = self.html
        soup = BeautifulSoup(html, 'html.parser')

        titles_tags = soup.findAll('div', class_ = 'snippet-title-row')
        titles = []
        for i in titles_tags:
            text = str(i)
            get_title = text.split('>')[4].split('<')[0].split('\n')[1]
            titles.append(get_title)
        return titles

    def get_price(self):
        html = self.html
        soup = BeautifulSoup(html, 'html.parser')

        price_tags = soup.findAll('span', class_ = 'price-text-1HrJ_ text-text-1PdBw text-size-s-1PUdo')
        prices = []
        for i in price_tags:
            text = str(i)
            get_price = text.split('>')[1].split('<')[0]
            prices.append(get_price)
        return prices

    def get_data(self):
        html = self.html
        soup = BeautifulSoup(html, 'html.parser')

        data_tags = soup.findAll('div', class_ = 'date-text-2jSvU text-text-1PdBw text-size-s-1PUdo text-color-noaccent-bzEdI')
        datas = []
        for i in data_tags:
            text = str(i)
            get_data = text.split('>')[1].split('<')[0]
            datas.append(get_data)
        return datas

# Здесь мы реализовываем методы
class Interface(Parse):
    def __init__(self, url):

        parse = Parse(url)                    # Создаем экземпляр класса, даем ссылку на страницу и получаем html-страницу
        self.title = parse.get_title()      # Получаем список, содержащий название
        self.prices = parse.get_price()  # Получаем список, содержащий цены
        self.data = parse.get_data()     # Получаем список, содержащий даты
        print(self.title)       
        print(self.prices)    
        print(self.data)      


Interface('https://www.avito.ru/pskov/tovary_dlya_kompyutera?q=i+7+7700')

Here I just rerun the code 3 times, didn't change anything

Answer 1

Random class endings hint at the fact that they are dynamically generated and do not always exist in the code. Use regular expressions if you want to search by class anyway
But I would do this

import requests
from bs4 import BeautifulSoup


url = 'https://www.avito.ru/pskov/tovary_dlya_kompyutera?q=i+7+7700'
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36'}

r = requests.get(url, headers=headers)

soup = BeautifulSoup(r.text, 'html.parser')
items = soup.find_all('div', {'class': 'item_table-wrapper'})

parsed_items = []
for item in items:
    parsed_items.append({'name': item.find('span', {'itemprop': 'name'}).get_text().strip(),
                         'price': item.find('meta', {'itemprop': 'price'})['content'],
                         'date': item.find('div', {'class': 'snippet-date-info'})['data-tooltip']
                         })

print(parsed_items)