Александр Жилин. Асинхронный Python глазами новичка

Я расскажу об особенностях асинхронного программирования на Python 3 и о своем опыте разработки микросервисов на Tornado и asyncio.

Transcript

10. 10 async def foo(): return "Hello, world! I'm asynchronous.“ async def bar(): return "Hi! I'm asynchronous too."
12. 12 import asyncio async def foo(): await asyncio.sleep(100500) return 'DATA' async def bar(): foo_result = await foo() return foo_result.lower()
14. 14 async def foo(): return "Hello, world! I'm asynchronous." result = foo() print(result)
15. 15 async def foo(): return "Hello, world! I'm asynchronous." result = foo() print(result) <coroutine object foo at 0x03C18F60>
16. 16 async def foo(): return "Hello, world! I'm asynchronous." result = await foo() print(result)
17. 17 async def foo(): return "Hello, world! I'm asynchronous." result = await foo() print(result) SyntaxError: invalid syntax
18. 18 from asyncio import get_event_loop async def foo(): return "Hello, world! I'm asynchronous." loop = get_event_loop() result = loop.run_until_complete(foo()) print(result)
19. 19 from asyncio import get_event_loop async def foo(): return "Hello, world! I'm asynchronous." loop = get_event_loop() result = loop.run_until_complete(foo()) print(result) Hello, world! I’m asynchronous.
20. 20 from asyncio import get_event_loop async def foo(): return "Hello, world! I'm asynchronous." loop = get_event_loop() result = loop.run_until_complete(foo()) print(result) Hello, world! I’m asynchronous.
21. 21 from tornado.platform.asyncio import AsyncIOMainLoop async def foo(): return "Hello, world! I'm asynchronous." loop = AsyncIOMainLoop() result = loop.run_sync(foo) print(result) Hello, world! I’m asynchronous.
22. 22 from tornado.platform.asyncio import AsyncIOMainLoop async def foo(): return "Hello, world! I'm asynchronous." loop = AsyncIOMainLoop() result = loop.run_sync(foo) print(result) Hello, world! I’m asynchronous.
23. 23 from tornado.platform.asyncio import AsyncIOMainLoop from functools import partial async def bar(username): return f"Hello, {username}! I'm asynchronous." loop = AsyncIOMainLoop() result = loop.run_sync(partial(bar, 'Vasya')) print(result) Hello, Vasya! I’m asynchronous.
24. 24 from tornado.platform.asyncio import AsyncIOMainLoop from functools import partial async def bar(username): return f"Hello, {username}! I'm asynchronous." loop = AsyncIOMainLoop() result = loop.run_sync(partial(bar, 'Vasya')) print(result) Hello, Vasya! I’m asynchronous.
26. 26 from mock import patch, mock import time def foo(): time.sleep(100500) return 'DATA' def bar(): foo_result = foo() return foo_result.lower() ... def test_bar(): patch('foo', new=mock.MagicMock(return_value='DATA')) assert bar() == 'data'
27. 27 from mock import patch, mock import time def foo(): time.sleep(100500) return 'DATA' def bar(): foo_result = foo() return foo_result.lower() ... def test_bar(): patch('foo', new=mock.MagicMock(return_value='DATA')) assert bar() == 'data'
28. 28 from mock import patch, mock import time def foo(): time.sleep(100500) return 'DATA' def bar(): foo_result = foo() return foo_result.lower() ... def test_bar(): patch('foo', new=mock.MagicMock(return_value='DATA')) assert bar() == 'data'
29. 29 from mock import patch, mock import pytest import asyncio async def foo(): await asyncio.sleep(100500) return 'DATA' async def bar(): foo_result = await foo() return foo_result.lower() ... async def test_bar(): patch('foo', new=mock.MagicMock(return_value='DATA')) assert await bar() == 'data'
30. 30 from mock import mock def async_mock(*args, **kwargs): m = mock.MagicMock(*args, **kwargs) async def mock_coroutine(*inner_args, **inner_kwargs): return m(*inner_args, **inner_kwargs) mock_coroutine.mock = m return mock_coroutine
31. 31 from mock import patch, mock import pytest def async_mock(*args, **kwargs): m = mock.MagicMock(*args, **kwargs) async def mock_coroutine(*inner_args, **inner_kwargs): return m(*inner_args, **inner_kwargs) mock_coroutine.mock = m return mock_coroutine async def test_bar(): patch('foo', new=async_mock(return_value='DATA')) assert await bar() == 'data'
32. 32 from mock import patch, mock import pytest def async_mock(*args, **kwargs): m = mock.MagicMock(*args, **kwargs) async def mock_coroutine(*inner_args, **inner_kwargs): return m(*inner_args, **inner_kwargs) mock_coroutine.mock = m return mock_coroutine async def test_bar(): patch('foo', new=async_mock(return_value='DATA')) assert await bar() == 'data'