pytest is a robust testing framework designed for developers requiring a solution for complex functional tests across applications and libraries. It simplifies testing with plain assert statements and provides detailed information on failing assertions. The framework supports auto-discovery of test modules and functions, along with modular fixtures to manage both small and long-lived test resources effectively.

Supporting Python 3.6+ and PyPy 3, pytest boasts a rich plugin architecture with over 315 external plugins available, enhancing its functionality. It is compatible with unittest and nose test suites, making it versatile for various testing needs. With commercial support and maintenance options from Tidelift, pytest aims to improve code health and streamline operations for businesses of all sizes.