The `QMutexLocker` class in PySide2.QtCore provides a convenient RAII (Resource Acquisition Is Initialization) mechanism for automatically locking and unlocking a mutex in multithreaded applications. It ensures that the mutex is always correctly released, even in the case of exceptions or early returns, by utilizing the C++ RAII principle. By using `QMutexLocker`, developers can simplify the management of mutex locks, resulting in more robust and reliable code.
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