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currentmodule:: asyncio\n\n\n\u003c/pre\u003e\n\u003ca name=\"user-content-extending\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch2 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eExtending\u003c/h2\u003e\u003ca id=\"user-content-extending\" class=\"anchor\" aria-label=\"Permalink: Extending\" href=\"#extending\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eThe main direction for \u003ca href=\"#id1\"\u003e\u003cspan id=\"user-content-id2\"\u003e:mod:`asyncio`\u003c/span\u003e\u003c/a\u003e extending is writing custom \u003cem\u003eevent loop\u003c/em\u003e\nclasses. Asyncio has helpers that could be used to simplify this task.\u003c/p\u003e\n\u003cdiv dir=\"auto\"\u003e\n\u003cp dir=\"auto\"\u003eNote\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eThird-parties should reuse existing asyncio code with caution,\na new Python version is free to break backward compatibility\nin \u003cem\u003einternal\u003c/em\u003e part of API.\u003c/p\u003e\n\u003c/div\u003e\n\u003ca name=\"user-content-writing-a-custom-event-loop\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eWriting a Custom Event Loop\u003c/h3\u003e\u003ca id=\"user-content-writing-a-custom-event-loop\" class=\"anchor\" aria-label=\"Permalink: Writing a Custom Event Loop\" href=\"#writing-a-custom-event-loop\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"#id3\"\u003e\u003cspan id=\"user-content-id4\"\u003e:class:`asyncio.AbstractEventLoop`\u003c/span\u003e\u003c/a\u003e declares very many methods. Implementing all them\nfrom scratch is a tedious job.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eA loop can get many common methods implementation for free by inheriting from\n\u003ca href=\"#id5\"\u003e\u003cspan id=\"user-content-id6\"\u003e:class:`asyncio.BaseEventLoop`\u003c/span\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eIn turn, the successor should implement a bunch of \u003cem\u003eprivate\u003c/em\u003e methods declared but not\nimplemented in \u003ca href=\"#id7\"\u003e\u003cspan id=\"user-content-id8\"\u003e:class:`asyncio.BaseEventLoop`\u003c/span\u003e\u003c/a\u003e.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor example, \u003ccode\u003eloop.create_connection()\u003c/code\u003e checks arguments, resolves DNS addresses, and\ncalls \u003ccode\u003eloop._make_socket_transport()\u003c/code\u003e that should be implemented by inherited class.\nThe \u003ccode\u003e_make_socket_transport()\u003c/code\u003e method is not documented and is considered as an\n\u003cem\u003einternal\u003c/em\u003e API.\u003c/p\u003e\n\u003ca name=\"user-content-future-and-task-private-constructors\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eFuture and Task private constructors\u003c/h3\u003e\u003ca id=\"user-content-future-and-task-private-constructors\" class=\"anchor\" aria-label=\"Permalink: Future and Task private constructors\" href=\"#future-and-task-private-constructors\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003e\u003ca href=\"#id9\"\u003e\u003cspan id=\"user-content-id10\"\u003e:class:`asyncio.Future`\u003c/span\u003e\u003c/a\u003e and \u003ca href=\"#id11\"\u003e\u003cspan id=\"user-content-id12\"\u003e:class:`asyncio.Task`\u003c/span\u003e\u003c/a\u003e should be never created directly,\nplease use corresponding \u003ca href=\"#id13\"\u003e\u003cspan id=\"user-content-id14\"\u003e:meth:`loop.create_future`\u003c/span\u003e\u003c/a\u003e and \u003ca href=\"#id15\"\u003e\u003cspan id=\"user-content-id16\"\u003e:meth:`loop.create_task`\u003c/span\u003e\u003c/a\u003e,\nor \u003ca href=\"#id17\"\u003e\u003cspan id=\"user-content-id18\"\u003e:func:`asyncio.create_task`\u003c/span\u003e\u003c/a\u003e factories instead.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eHowever, third-party \u003cem\u003eevent loops\u003c/em\u003e may \u003cem\u003ereuse\u003c/em\u003e built-in future and task implementations\nfor the sake of getting a complex and highly optimized code for free.\u003c/p\u003e\n\u003cp dir=\"auto\"\u003eFor this purpose the following, \u003cem\u003eprivate\u003c/em\u003e constructors are listed:\u003c/p\u003e\n\u003cpre\u003e.. method:: Future.__init__(*, loop=None)\n\n Create a built-in future instance.\n\n *loop* is an optional event loop instance.\n\n\u003c/pre\u003e\n\u003cpre\u003e.. method:: Task.__init__(coro, *, loop=None, name=None, context=None)\n\n Create a built-in task instance.\n\n *loop* is an optional event loop instance. The rest of arguments are described in\n :meth:`loop.create_task` description.\n\n .. versionchanged:: 3.11\n\n *context* argument is added.\n\n\n\n\u003c/pre\u003e\n\u003ca name=\"user-content-task-lifetime-support\"\u003e\u003c/a\u003e\n\u003cdiv class=\"markdown-heading\" dir=\"auto\"\u003e\u003ch3 tabindex=\"-1\" class=\"heading-element\" dir=\"auto\"\u003eTask lifetime support\u003c/h3\u003e\u003ca id=\"user-content-task-lifetime-support\" class=\"anchor\" aria-label=\"Permalink: Task lifetime support\" href=\"#task-lifetime-support\"\u003e\u003csvg class=\"octicon octicon-link\" viewBox=\"0 0 16 16\" version=\"1.1\" width=\"16\" height=\"16\" aria-hidden=\"true\"\u003e\u003cpath d=\"m7.775 3.275 1.25-1.25a3.5 3.5 0 1 1 4.95 4.95l-2.5 2.5a3.5 3.5 0 0 1-4.95 0 .751.751 0 0 1 .018-1.042.751.751 0 0 1 1.042-.018 1.998 1.998 0 0 0 2.83 0l2.5-2.5a2.002 2.002 0 0 0-2.83-2.83l-1.25 1.25a.751.751 0 0 1-1.042-.018.751.751 0 0 1-.018-1.042Zm-4.69 9.64a1.998 1.998 0 0 0 2.83 0l1.25-1.25a.751.751 0 0 1 1.042.018.751.751 0 0 1 .018 1.042l-1.25 1.25a3.5 3.5 0 1 1-4.95-4.95l2.5-2.5a3.5 3.5 0 0 1 4.95 0 .751.751 0 0 1-.018 1.042.751.751 0 0 1-1.042.018 1.998 1.998 0 0 0-2.83 0l-2.5 2.5a1.998 1.998 0 0 0 0 2.83Z\"\u003e\u003c/path\u003e\u003c/svg\u003e\u003c/a\u003e\u003c/div\u003e\n\u003cp dir=\"auto\"\u003eA third party task implementation should call the following functions to keep a task\nvisible by \u003ca href=\"#id19\"\u003e\u003cspan id=\"user-content-id20\"\u003e:func:`asyncio.all_tasks`\u003c/span\u003e\u003c/a\u003e and \u003ca href=\"#id21\"\u003e\u003cspan id=\"user-content-id22\"\u003e:func:`asyncio.current_task`\u003c/span\u003e\u003c/a\u003e:\u003c/p\u003e\n\u003cpre\u003e.. function:: _register_task(task)\n\n Register a new *task* as managed by *asyncio*.\n\n Call the function from a task constructor.\n\n\u003c/pre\u003e\n\u003cpre\u003e.. function:: _unregister_task(task)\n\n Unregister a *task* from *asyncio* internal structures.\n\n The function should be called when a task is about to finish.\n\n\u003c/pre\u003e\n\u003cpre\u003e.. function:: _enter_task(loop, task)\n\n Switch the current task to the *task* argument.\n\n Call the function just before executing a portion of embedded *coroutine*\n (:meth:`coroutine.send` or :meth:`coroutine.throw`).\n\n\u003c/pre\u003e\n\u003cpre\u003e.. function:: _leave_task(loop, task)\n\n Switch the current task back from *task* to ``None``.\n\n Call the function just after :meth:`coroutine.send` or :meth:`coroutine.throw`\n execution.\n\u003c/pre\u003e\n\n\u003c/article\u003e","renderedFileInfo":null,"shortPath":null,"symbolsEnabled":true,"tabSize":8,"topBannersInfo":{"overridingGlobalFundingFile":false,"globalPreferredFundingPath":"/python/.github/blob/5a0a7cb55767fb3667fe2391bcb66bda638edcb4/FUNDING.yml","showInvalidCitationWarning":false,"citationHelpUrl":"https://docs.github.com/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-citation-files","actionsOnboardingTip":null},"truncated":false,"viewable":true,"workflowRedirectUrl":null,"symbols":{"timed_out":false,"not_analyzed":true,"symbols":[]}},"copilotInfo":null,"copilotAccessAllowed":false,"modelsAccessAllowed":false,"modelsRepoIntegrationEnabled":false,"csrf_tokens":{"/python/cpython/branches":{"post":"BTRY3kcQsa1REcACOVDbUj8X1SxxKSRKDXXDs0hpcQ3mmSDApWqhhgr25kh_CW9FZK84l_cCMxejpowYbcCjBA"},"/repos/preferences":{"post":"p5QQ494DcnIXerh0ylDbdHhckQtgV0ZnKyYdSk_Vk_zvPsYLprWSZPPiQUTLnG1P4ZbeJSDSeCVVRAC1RD42dw"}}},"title":"cpython/Doc/library/asyncio-extending.rst at main · python/cpython","appPayload":{"helpUrl":"https://docs.github.com","findFileWorkerPath":"/assets-cdn/worker/find-file-worker-7d7eb7c71814.js","findInFileWorkerPath":"/assets-cdn/worker/find-in-file-worker-1ae9fa256942.js","githubDevUrl":null,"enabled_features":{"code_nav_ui_events":false,"react_blob_overlay":false,"accessible_code_button":true,"github_models_repo_integration":false}}}
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