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A looping call in the Twisted framework's internet reactor module is a function that is repeatedly called at a fixed interval using a timer mechanism. The function is called with a delay between calls, and is intended to perform non-blocking I/O operations. This allows the application to perform other operations while waiting for I/O events to occur. When an I/O event occurs, the reactor signals the application to perform the actual I/O, and the application can then resume executing its main loop. Looping calls are a useful way to handle recurring tasks such as polling a network service or periodically checking for new data.