How to rename the resulting file in Python without changing its extension?

Question

Python

I receive an email, and if it has an attachment, I receive that as well. Then I send this letter along with an attachment to telegram. But the problem is that if the file name in the attachment is in Russian, then I get an error

TypeError: decoding to str: need a bytes-like object, Header found

How did you solve the problem with the Cyrillic alphabet?

PS: the encoding is set in the script header

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

Answer 1

I read the "Unicode HOWTO" section of the documentation, I had no problems with Cyrillic.