René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"deprecate the asyncio child watchers system","articleBody":"Deprecate the child watchers system and the policy system in favour of \r\n`asyncio.Runner(loop_factory=asyncio.ProactorEventLoop/asyncio.SelectorEventLoop/uvloop.new_event_loop)` \r\nthat would be deprecating:\r\n\r\n```\r\nasyncio.get_event_loop() # already deprecated unless the loop is running \r\nasyncio.set_event_loop()  # asyncio.set_event_loop(None) should probably be exempt\r\nasyncio.get_event_loop_policy()\r\nasyncio.set_event_loop_policy()  # asyncio.set_event_loop_policy(None) should probably be exempt\r\nasyncio.set_child_watcher()\r\nasyncio.get_child_watcher()  # `_make_subprocess_transport` will instead attempt to use os.open_pidfd and fallback to starting a thread\r\n```\r\n\r\nI'd also like to introduce a new API: `asyncio.EventLoop` implemented as:\r\n\r\n```\r\nif sys.platform == \"win32\":\r\n    EventLoop = ProactorEventLoop\r\nelse:\r\n    EventLoop = SelectorEventLoop\r\n```\r\n\r\n`asyncio.new_event_loop()` will issue a DeprecationWarning if the current policy is not the default policy, and then in 3 releases become an alias of `asyncio.EventLoop`\r\n\r\n_Originally posted by @graingert in https://github.com/python/cpython/issues/93896#issuecomment-1159182995_\r\n\n\n\u003c!-- gh-pr-number: gh-99386 --\u003e\n* PR: gh-99386\n\u003c!-- /gh-pr-number --\u003e\n\n\n\u003c!-- gh-pr-number: gh-110723 --\u003e\n* PR: gh-110723\n\u003c!-- /gh-pr-number --\u003e\n\n\n\u003c!-- gh-pr-number: gh-110728 --\u003e\n* PR: gh-110728\n\u003c!-- /gh-pr-number --\u003e\n","author":{"url":"https://github.com/graingert","@type":"Person","name":"graingert"},"datePublished":"2022-07-06T08:26:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":33},"url":"https://github.com/94597/cpython/issues/94597"}