PyQt graphical user interface (GUI) applications have a main thread of execution that runs the event loop and GUI. If you launch a long-running task in this thread, then your GUI will freeze until the task terminates. During that time, the user won’t be able to interact with the application, resulting in a bad user experience. Luckily, PyQt’s QThread class allows you to work around this issue.

In this tutorial, you’ll learn how to:

• Use PyQt’s QThread to prevent freezing GUIs
• Create reusable threads with QThreadPool and QRunnable
• Manage interthread communication using signals and slots
• Safely use shared resources with PyQt’s locks
• Use best practices for developing GUI applications with PyQt’s thread support

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