How to fix an error in the code when running on Ubuntu?

Question

linux

Good day.
The question will seem strange, but the code below runs perfectly and parses the title and text of the news from rss on a Windows system.

rssurl = 'https://news.yandex.ru/security.rss'
feed = feedparser.parse(rssurl)
title = feed['entries'][1]['title']
text = feed['entries'][1]['summary']

The same code, run on Ubuntu python3 test.py - produces

title = feed['entries'][1]['title']
IndexError: list index out of range.

Question - why so? After all, there is no difference - in both systems python3.