The `run_sync` method in the `tornado.ioloop.IOLoop` class is used to run a single coroutine synchronously in the event loop. This method takes a coroutine as input, executes it, and then returns the result. It ensures that the code inside the coroutine is executed sequentially and in a non-blocking manner, allowing other coroutines to run concurrently. This method is commonly used in Tornado applications to execute asynchronous code in a synchronous manner, simplifying the programming model.
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