Worked on the numpy/numpy repository to enhance the documentation and code quality of the count_nonzero API. Focused on improving maintainability and clarity, the work involved removing outdated Python 2 references from the docstring and addressing linting issues identified by continuous integration checks. Using Python and leveraging skills in documentation and code quality improvement, the changes ensured that the API guidance is clearer for users and that the codebase aligns with modern standards. These updates did not alter the function’s behavior but reduced future maintenance risks and made onboarding easier for new contributors, supporting more reliable and maintainable development workflows.