What are unit tests in Python?

 Unit tests in Python are automated tests that verify the functionality of individual units of code, such as functions or methods, in isolation from the rest of the code. They are used to ensure that code changes do not break existing functionality and to catch bugs early in the development process. In Python, unit tests are typically written using the unittest module, which provides a framework for writing and running tests, asserting expected results, and reporting on test results. The goal of unit tests is to identify and isolate issues as early as possible in the development cycle, making it easier to fix them and prevent them from affecting the rest of the codebase.