from bs4 import BeautifulSoup
from urllib.request import urlopen

html = BeautifulSoup(urlopen('https://telegra.ph/pythonchatru-07-07'), 'lxml')


def get_rule(li):
    li = int(li)
    lis = html.find_all('li')
    if li <= len(lis):
        return lis[li - 1].text
    else:
        return f'Пока не придумали.'