asyncio
— Asynchronous I/O¶
asyncio is a library to write concurrent code using the async/await syntax.
asyncio is used as a foundation for multiple Python asynchronous frameworks that provide high-performance network and web-servers, database connection libraries, distributed task queues, etc.
asyncio is often a perfect fit for IO-bound and high-level structured network code.
asyncio provides a set of high-level APIs to:
run Python coroutines concurrently and have full control over their execution;
perform network IO and IPC;
control subprocesses;
distribute tasks via queues;
synchronize concurrent code;
Additionally, there are low-level APIs for library and framework developers to:
create and manage event loops, which provide asynchronous APIs for
networking
, runningsubprocesses
, handlingOS signals
, etc;implement efficient protocols using transports;
bridge callback-based libraries and code with async/await syntax.
asyncio REPL
You can experiment with an asyncio
concurrent context in the REPL:
$ python -m asyncio
asyncio REPL ...
Use "await" directly instead of "asyncio.run()".
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> await asyncio.sleep(10, result='hello')
'hello'
Raises an auditing event cpython.run_stdin
with no arguments.
Zmienione w wersji 3.10.15: (also 3.9.20, and 3.8.20) Emits audit events.
Reference
Informacja
The source code for asyncio can be found in Lib/asyncio/.