The `exec` method of `QEventLoop` in PyQt5.QtCore is used to start and run the event loop.
An event loop is responsible for handling and processing events, such as user input or system signals, in a graphical user interface (GUI) application. The `exec` method starts the event loop and blocks the program until the loop is terminated or exited.
During the event loop, the application waits for events to occur and dispatches them to the appropriate event handlers. This allows the application to respond to user interactions and update the GUI accordingly.
The `exec` method is typically called after setting up the necessary event handlers and initiating the initial state of the application. It is commonly used to start the execution of a PyQt5 application and keep it running until it is explicitly terminated or the user closes the main window.
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