To implement unit testing in Python, use the built-in `unittest` module. Create test cases as subclasses of `unittest.TestCase` and use assertions to validate expected outcomes.

Unit testing is a vital part of software development that helps ensure your code functions as intended. Python provides a built-in unittest module that makes it easy to write and run tests. To get started, create a separate test file where you will define your test cases. Each test case should be a subclass of unittest.TestCase. Inside this class, define methods that test specific functionality, using assert statements to compare expected outcomes with actual results. For instance, use self.assertEqual(actual, expected) to check for equality. You can organize your tests into test suites, allowing you to run multiple tests at once. To execute the tests, run your test script, or use the command line with python -m unittest to discover and run all tests. Additionally, consider using pytest, a third-party testing framework that offers more features and simpler syntax. Incorporating unit testing into your development workflow helps catch bugs early, facilitates code changes, and ultimately leads to more reliable software.