Advanced Python Programming

Coroutines, event loops, and futures

There are a few common elements that most asynchronous programs have, and coroutines, event loops, and futures are three of those elements. They are defined as follows:

• Event loops are the main coordinators of tasks in an asynchronous program. An event loop keeps track of all of the tasks that are to be run asynchronously, and decides which of those tasks should be executed at a given moment. In other words, event loops handle the task switching aspect (or the execution flow) of asynchronous programming.
• Coroutines are a special type of function that wrap around specific tasks, so that they can be executed asynchronously. A coroutine is required in order to specify where in the function the task switching ...