How Does asyncio Enable Concurrency in Python?

How does asyncio work?

asyncio is a Python module that provides support for asynchronous I/O. It allows multiple coroutines to run concurrently, sharing a single event loop. Coroutines are functions that can be paused and resumed, and they are essential for writing asynchronous code.

asyncio uses a combination of features from Python 3.4 and 3.5 to implement coroutines. These features include yield from, which allows coroutines to pass data back and forth, and await, which allows coroutines to be paused and resumed.

In addition to coroutines, asyncio also provides a number of other objects, including tasks, futures, and event loops. Tasks are objects that wrap around coroutines and provide a number of additional features, such as the ability to be cancelled. Futures are objects that represent the result of an asynchronous operation, and they can be used to wait for the operation to complete. Event loops are objects that drive the execution of coroutines and tasks.

asyncio's event loop is based on the select function, which is a system call that allows programs to wait for multiple events to occur. When an event occurs, select returns the set of sockets that are ready for reading or writing. asyncio uses this information to schedule the execution of the appropriate coroutines and tasks.

asyncio is a powerful tool for writing asynchronous code in Python. It can be used to write a variety of applications, including web servers, network servers, and distributed systems.

The above is the detailed content of How Does asyncio Enable Concurrency in Python?. For more information, please follow other related articles on the PHP Chinese website!