Worked on enhancing the visualization component in the optuna/optuna repository by refactoring the core visualization script to adopt Python f-strings, focusing on improving code readability and reducing formatting overhead. This update streamlined the data visualization workflow, making the codebase more maintainable and accessible for contributors. The approach emphasized refactoring existing Python code to align with project standards, supporting faster iteration and easier onboarding for new developers. No major bugs were addressed during this period, as the primary effort centered on code quality and performance readiness. The work leveraged skills in Python, data visualization, and code refactoring to improve maintainability.