[Python] Telegram bot API limitations

If you open telegram bot FAQ you can see 1 message per second inside particular chat, 30 messages per second inside group chat and less than 20 messages per minute inside group chat.

I have simple telegram bot with simple rate limiter:

1. it doesn't use group chats;
2. it sends only 1 message per second inside particular chat;
3. it sends less than 20 messages per minute inside particular chat;

But i always receive 429 error:

"error_code":429,"description":"Too Many Requests: retry after 236"


I confused since i don't violate telegram limitations. Please, help me to find problem.

Source code here, bot uses this library for interaction with telegram in poll mode. Steps to reproduce:

1) python3 bot.py;
2) /start in bot;
3) click "Спектакли";
4) click very fast on "Трагикомедии" or "Драма";

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