Worked on the python/typeshed repository to enhance type safety and clarity in Python’s standard library stubs. Focused on correcting the type annotation for the unittest.TestProgram.module attribute, updating it to accept ModuleType or None. This targeted change addressed a bug that previously caused static-analysis false positives for unittest usage, aligning the stubs more closely with actual runtime behavior. The update was implemented as a single, well-scoped commit and validated through continuous integration to ensure no regressions. Leveraged expertise in Python, type annotations, and unit testing to improve developer experience for those relying on accurate type hints in their workflows.