Python has a rich ecosystem of libraries that can be used for automation testing. Here are some popular Python libraries for automation testing:

1. Selenium WebDriver: Selenium is one of the most widely used automation testing tools for web applications. Selenium WebDriver allows you to interact with web elements and simulate user actions like clicking, typing, and navigating. You can use Selenium WebDriver with various web browsers such as Chrome, Firefox, Safari, etc.

2. pytest: pytest is a popular testing framework that provides a simple and easy-to-use syntax for writing test cases. It has excellent support for fixtures, parameterized testing, and plugins that can integrate with other tools easily.

3. unittest: unittest is Python’s built-in testing framework, inspired by Java’s JUnit. It provides a testing framework, test discovery, and test execution for writing unit tests.

4. PyTest-BDD: PyTest-BDD is a plugin for pytest that allows you to write BDD (Behavior Driven Development) style tests using Gherkin language. It integrates with tools like Behave and lets you write feature files and step definitions.

5. Robot Framework: Robot Framework is an open-source automation testing framework that uses a simple and readable tabular syntax. It supports keyword-driven testing and can be extended with libraries written in Python or other languages.

6. Appium: Appium is an automation tool specifically designed for mobile applications. It allows you to test native, hybrid, and mobile web apps on Android and iOS platforms.

7. Cypress: Although Cypress is primarily used for front-end testing, it has excellent capabilities for automating browser-based applications. While it’s not Python-based, you can use Python to interact with Cypress through its REST API.

8. Requests: Requests is a widely-used library for making HTTP requests in Python. It’s not an automation testing tool per se, but it can be useful for API testing and interacting with web services.

9. TestProject: TestProject is a cloud-based test automation platform that allows you to write automation tests in Python using its SDK. It provides an easy-to-use interface and supports web, mobile, and API testing.

10. Behave: Behave is a BDD framework for Python that lets you write human-readable tests using the Gherkin language. It integrates well with Selenium WebDriver for web application testing.

These libraries offer various features and functionalities, so the choice of the right library depends on the specific requirements of your automation project. Selenium WebDriver is the most commonly used for web testing, while pytest and unittest are excellent choices for general-purpose testing. For mobile testing, Appium is a popular option.