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async/await and asyncio in Python 3.6 and beyond
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Yury Selivanov
May 21, 2017
Programming
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2.2k
async/await and asyncio in Python 3.6 and beyond
Video of the talk:
https://www.youtube.com/watch?v=2ZFFv-wZ8_g
Yury Selivanov
May 21, 2017
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Transcript
async/await and asyncio in Python 3.6 and beyond Yury Selivanov
@1st1 y@magic.io PyCon US 2017
About me Core developer since 2013 PEPs: 362, 492, 525,
530 asyncio/uvloop/asyncpg MagicStack -> magic.io
Let’s talk about async/await.
Why async/await? Other Ways threads; callbacks / promises; generators with
‘yield from’. gevent / eventlet / stackless;
Why async/await? Readability Better than callbacks or Promises; Easier to
reason about than with threads or gevent code; Promotes better patterns: message passing.
Why async/await? Theory Practice Multithreading
Why async/await? Efficiency No threads: no GIL problem; Less memory
per connection; Can handle thousands of long lasting connections.
What is async/await? Syntax: new in 3.5
What is async/await? Syntax: new in 3.6
What is async/await? Syntax: 3.7 (maybe)
What is async/await? Protocol Based on iterator protocol; __await__; __aiter__,
__anext__; __aenter__, __aexit__.
How to async/await? Frameworks OS Python Interpreter Async Framework Application
Framework Application
How to async/await? Twisted and Tornado Twisted is the mother
of async in Python; both own big ecosystems and mindshare; can/will run on top of asyncio.
How to async/await? Twisted and Tornado
How to async/await? Curio and Trio explore new approaches; (influence
asyncio) make async easier to use; not mainstream.
Let’s talk about asyncio.
What is asyncio? Foundation low-level APIs; async/await; here to stay;
pluggable event loop.
What is asyncio? Low-level APIs Transports and Protocols; network, subprocesses,
signals. callbacks;
What is asyncio? async/await streams, sockets, subprocesses, locks, timeouts. run
coroutines;
What is asyncio? Mainstream healthy ecosystem; HTTP: aiohttp and Sanic;
stable and forever supported; DBs: asyncpg, aio-libs, etc.
What is asyncio? Pluggable event loop uvloop: make asyncio 2-4
times faster.
PyO 3
What is asyncio? Pluggable event loop github.com/pyo3: Tokio; Rust meets
Python; incomplete and experimental; aims for safety and performance.
What’s next for asyncio?
What’s next? Goals for 3.7 maybe curio and trio can
be (re-)built on top of asyncio? run/use Twisted on/in asyncio; that Rust loop…
What’s next? Usability Documentation overhaul in 3.7
What’s next? Usability: now asyncio.get_event_loop() loop.create_task() loop.run_until_complete() loop.run_forever() asyncio.gather() loop.run_in_executor()
What’s next? Usability: now asyncio.get_event_loop() in Python 3.6 is predictable
in async functions pass event loop explicitly
What’s next? Usability: in 3.7? asyncio.get_event_loop() loop.create_task() loop.run_until_complete() loop.run_forever() asyncio.gather()
loop.run_in_executor()
What’s next? More New Things? start_tls() Call / Task Context
async REPL
What’s next? We Need Your Help Ask for new features!
bugs.python.org python-tulip mailing list GitHub!
Thank you!