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10 Commits

Author SHA1 Message Date
Kazantcev Andrey 178695b7ae
bpo-40816 Add AsyncContextDecorator class (GH-20516) 
Co-authored-by: Yury Selivanov <yury@edgedb.com>
 2020-11-05 10:52:24 +02:00
Joongi Kim 6e8dcdaaa4
bpo-41229: Update docs for explicit aclose()-required cases and add contextlib.aclosing() method (GH-21545) 
This is a PR to:

 * Add `contextlib.aclosing` which ia analogous to `contextlib.closing` but for async-generators with an explicit test case for [bpo-41229]()
 * Update the docs to describe when we need explicit `aclose()` invocation.

which are motivated by the following issues, articles, and examples:

 * [bpo-41229]()
 * https://github.com/njsmith/async_generator
 * https://vorpus.org/blog/some-thoughts-on-asynchronous-api-design-in-a-post-asyncawait-world/#cleanup-in-generators-and-async-generators
 * https://www.python.org/dev/peps/pep-0533/
 * https://github.com/achimnol/aiotools/blob/ef7bf0cea7af/src/aiotools/context.py#L152

Particuarly regarding [PEP-533](https://www.python.org/dev/peps/pep-0533/), its acceptance (`__aiterclose__()`) would make this little addition of `contextlib.aclosing()` unnecessary for most use cases, but until then this could serve as a good counterpart and analogy to `contextlib.closing()`. The same applies for `contextlib.closing` with `__iterclose__()`.
Also, still there are other use cases, e.g., when working with non-generator objects with `aclose()` methods.
 2020-11-02 00:02:48 -08:00
Serhiy Storchaka 142566c028
[3.9] bpo-37116: Use PEP 570 syntax for positional-only parameters. (GH-12620) 
Turn deprecation warnings added in 3.8 into TypeError.
 2019-06-05 18:22:31 +03:00
Serhiy Storchaka 42a139ed88
bpo-36492: Deprecate passing some arguments as keyword arguments. (GH-12637) 
Deprecated passing the following arguments as keyword arguments:

- "func" in functools.partialmethod(), weakref.finalize(),
  profile.Profile.runcall(), cProfile.Profile.runcall(),
  bdb.Bdb.runcall(), trace.Trace.runfunc() and
  curses.wrapper().
- "function" in unittest.addModuleCleanup() and
  unittest.TestCase.addCleanup().
- "fn" in the submit() method of concurrent.futures.ThreadPoolExecutor
  and concurrent.futures.ProcessPoolExecutor.
- "callback" in contextlib.ExitStack.callback(),
  contextlib.AsyncExitStack.callback() and
  contextlib.AsyncExitStack.push_async_callback().
- "c" and "typeid" in the create() method of multiprocessing.managers.Server
  and multiprocessing.managers.SharedMemoryServer.
- "obj" in weakref.finalize().

Also allowed to pass arbitrary keyword arguments (even "self" and "func")
if the above arguments are passed as positional argument.
 2019-04-01 09:16:35 +03:00
Serhiy Storchaka db8e3a1e44
bpo-34183: Fix running Lib/test/test_contextlib_async.py as a script. (GH-8381) 2018-07-23 23:38:31 +03:00
Yury Selivanov 52698c7ad9
bpo-33786: Fix asynchronous generators to handle GeneratorExit in athrow() (GH-7467) 2018-06-07 20:31:26 -04:00
Brett Cannon 8425de4147
bpo-33562: Check the global asyncio event loop policy isn't set after any tests (GH-7328) 2018-06-01 20:34:09 -07:00
Ilya Kulakov 1aa094f740 bpo-29302: Implement contextlib.AsyncExitStack. (#4790) 2018-01-25 15:51:18 -05:00
Jelle Zijlstra 176baa326b bpo-30241: implement contextlib.AbstractAsyncContextManager (#1412) 2017-12-13 20:19:17 -05:00
Jelle Zijlstra 2e624690bd bpo-29679: Implement @contextlib.asynccontextmanager (#360) 2017-04-30 18:25:58 -07:00