Worked on the mne-tools/mne-python repository to modernize code quality by refactoring string formatting throughout the codebase. Focused on replacing legacy percent-style string formatting with Python f-strings, the update aimed to enhance both readability and long-term maintainability. This targeted refactor, implemented in Python, standardized formatting practices and reduced the risk of formatting-related errors, laying groundwork for future code improvements. No major bugs were addressed during this period, as the primary contribution centered on software maintenance and code refactoring. The work supports easier future changes and helps ensure consistent, modern coding standards across the repository’s Python codebase.