The `exec_()` method in the `ModelerDialog` class of the `processing.modeler.ModelerDialog` module in Python is used to execute the modeler dialog. It displays the modeler dialog window on the screen and allows the user to interactively define and run processing models. This method starts the event loop for the modeler dialog, allowing the user to interact with the interface and perform model-related actions such as adding, editing, or removing model algorithm nodes. Additionally, this method handles user inputs and triggers the corresponding actions in the modeler dialog.
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