QPersistentModelIndex is a class in PyQt4.QtCore module of Python's PyQt library. It provides a persistent model index that can be used to track model items even when the underlying model changes. This class is useful when you want to maintain a reference to a model index after model modifications, allowing you to access and manipulate the model data consistently. QPersistentModelIndex is particularly useful in scenarios where you need to store indexes across different sessions or application restarts.
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