Problem with not highlited and red marked text in Visual Studio Code – Python

I have a problem with not highlighted and red marked text in Visual Studio Code.
Some pictures below:

General overview:

Problem in code and not red marked:

Corrected codeS:

Print of corrected code:

Generally:

• Main functionality of Visual Studio Code is meet
• Wrong text is not red marked
• Variables are not blue marked

Settings:

• Color theme: Dark+
• Visual Studio Code 1.83.1
• Python extension v2023.18.0

Other actions I’ve tried:

• Reinstalled Visual Studio Code (also manually deleted everything in subfolders)
• Reinstalled all extensions (also manually deleted everything in subfolders)

I have no clue what isn’t working. Anyway I have tried to do some stuff from other posts which were similar to mine but none of them helped me.