In my experience with Python, I have extensively used unit testing to ensure the reliability and functionality of the code. I typically use the Pytest framework for unit testing due to its simplicity and powerful features. Let me clarify this with an example: In one of my projects, I was responsible for developing a RESTful API using Flask. During the development phase, I encountered a challenge where certain API endpoints were not returning the expected data. To address this, I wrote a series of unit tests to isolate the problem. These tests helped me identify that the issue was due to incorrect data mapping in the database queries. By debugging through these tests, I was able to correct the mapping and ensure that all endpoints returned the correct data. This experience taught me the importance of thorough testing and debugging in maintaining code quality and reliability.