PR Description

Summary

Fixes #2937 - Python f-string comment parsing for Python 3.12+

Problem

Python 3.12+ allows # comments inside f-string expressions, where comments extend to the end of line. However, Pygments incorrectly recognized } inside comments as the end of the f-string expression.

Changes Made

Modified pygments/lexers/python.py in the expr-inside-fstring state:

'expr-inside-fstring': [
    (r'#[^\n]*', Comment.Single),     # Match # comment to end of line
    (r'\n', Whitespace),       # Return to parent state on newline
    # ... existing rules
],

Result

Related Issues

#2937