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  197.   <section id="low-level-api-index">

  198. <h1>Low-level API Index<a class="headerlink" href="#low-level-api-index" title="Link to this heading">¶</a></h1>

  199. <p>This page lists all low-level asyncio APIs.</p>

  200. <section id="obtaining-the-event-loop">

  201. <h2>Obtaining the Event Loop<a class="headerlink" href="#obtaining-the-event-loop" title="Link to this heading">¶</a></h2>

  202. <table class="full-width-table docutils align-default">

  203. <colgroup>

  204. <col style="width: 50.0%" />

  205. <col style="width: 50.0%" />

  206. </colgroup>

  207. <tbody>

  208. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.get_running_loop" title="asyncio.get_running_loop"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.get_running_loop()</span></code></a></p></td>

  209. <td><p>The <strong>preferred</strong> function to get the running event loop.</p></td>

  210. </tr>

  211. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.get_event_loop" title="asyncio.get_event_loop"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.get_event_loop()</span></code></a></p></td>

  212. <td><p>Get an event loop instance (running or current via the current policy).</p></td>

  213. </tr>

  214. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.set_event_loop" title="asyncio.set_event_loop"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.set_event_loop()</span></code></a></p></td>

  215. <td><p>Set the event loop as current via the current policy.</p></td>

  216. </tr>

  217. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.new_event_loop" title="asyncio.new_event_loop"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.new_event_loop()</span></code></a></p></td>

  218. <td><p>Create a new event loop.</p></td>

  219. </tr>

  220. </tbody>

  221. </table>

  222. <p class="rubric">Examples</p>

  223. <ul class="simple">

  224. <li><p><a class="reference internal" href="asyncio-future.html#asyncio-example-future"><span class="std std-ref">Using asyncio.get_running_loop()</span></a>.</p></li>

  225. </ul>

  226. </section>

  227. <section id="event-loop-methods">

  228. <h2>Event Loop Methods<a class="headerlink" href="#event-loop-methods" title="Link to this heading">¶</a></h2>

  229. <p>See also the main documentation section about the

  230. <a class="reference internal" href="asyncio-eventloop.html#asyncio-event-loop-methods"><span class="std std-ref">Event Loop Methods</span></a>.</p>

  231. <p class="rubric">Lifecycle</p>

  232. <table class="full-width-table docutils align-default">

  233. <colgroup>

  234. <col style="width: 50.0%" />

  235. <col style="width: 50.0%" />

  236. </colgroup>

  237. <tbody>

  238. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.run_until_complete" title="asyncio.loop.run_until_complete"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.run_until_complete()</span></code></a></p></td>

  239. <td><p>Run a Future/Task/awaitable until complete.</p></td>

  240. </tr>

  241. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.run_forever" title="asyncio.loop.run_forever"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.run_forever()</span></code></a></p></td>

  242. <td><p>Run the event loop forever.</p></td>

  243. </tr>

  244. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.stop" title="asyncio.loop.stop"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.stop()</span></code></a></p></td>

  245. <td><p>Stop the event loop.</p></td>

  246. </tr>

  247. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.close" title="asyncio.loop.close"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.close()</span></code></a></p></td>

  248. <td><p>Close the event loop.</p></td>

  249. </tr>

  250. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.is_running" title="asyncio.loop.is_running"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.is_running()</span></code></a></p></td>

  251. <td><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the event loop is running.</p></td>

  252. </tr>

  253. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.is_closed" title="asyncio.loop.is_closed"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.is_closed()</span></code></a></p></td>

  254. <td><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the event loop is closed.</p></td>

  255. </tr>

  256. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.shutdown_asyncgens" title="asyncio.loop.shutdown_asyncgens"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.shutdown_asyncgens()</span></code></a></p></td>

  257. <td><p>Close asynchronous generators.</p></td>

  258. </tr>

  259. </tbody>

  260. </table>

  261. <p class="rubric">Debugging</p>

  262. <table class="full-width-table docutils align-default">

  263. <colgroup>

  264. <col style="width: 50.0%" />

  265. <col style="width: 50.0%" />

  266. </colgroup>

  267. <tbody>

  268. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.set_debug" title="asyncio.loop.set_debug"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.set_debug()</span></code></a></p></td>

  269. <td><p>Enable or disable the debug mode.</p></td>

  270. </tr>

  271. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.get_debug" title="asyncio.loop.get_debug"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.get_debug()</span></code></a></p></td>

  272. <td><p>Get the current debug mode.</p></td>

  273. </tr>

  274. </tbody>

  275. </table>

  276. <p class="rubric">Scheduling Callbacks</p>

  277. <table class="full-width-table docutils align-default">

  278. <colgroup>

  279. <col style="width: 50.0%" />

  280. <col style="width: 50.0%" />

  281. </colgroup>

  282. <tbody>

  283. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.call_soon" title="asyncio.loop.call_soon"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.call_soon()</span></code></a></p></td>

  284. <td><p>Invoke a callback soon.</p></td>

  285. </tr>

  286. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.call_soon_threadsafe" title="asyncio.loop.call_soon_threadsafe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.call_soon_threadsafe()</span></code></a></p></td>

  287. <td><p>A thread-safe variant of <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.call_soon" title="asyncio.loop.call_soon"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.call_soon()</span></code></a>.</p></td>

  288. </tr>

  289. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.call_later" title="asyncio.loop.call_later"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.call_later()</span></code></a></p></td>

  290. <td><p>Invoke a callback <em>after</em> the given time.</p></td>

  291. </tr>

  292. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.call_at" title="asyncio.loop.call_at"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.call_at()</span></code></a></p></td>

  293. <td><p>Invoke a callback <em>at</em> the given time.</p></td>

  294. </tr>

  295. </tbody>

  296. </table>

  297. <p class="rubric">Thread/Process Pool</p>

  298. <table class="full-width-table docutils align-default">

  299. <colgroup>

  300. <col style="width: 50.0%" />

  301. <col style="width: 50.0%" />

  302. </colgroup>

  303. <tbody>

  304. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.run_in_executor" title="asyncio.loop.run_in_executor"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.run_in_executor()</span></code></a></p></td>

  305. <td><p>Run a CPU-bound or other blocking function in

  306. a <a class="reference internal" href="concurrent.futures.html#module-concurrent.futures" title="concurrent.futures: Execute computations concurrently using threads or processes."><code class="xref py py-mod docutils literal notranslate"><span class="pre">concurrent.futures</span></code></a> executor.</p></td>

  307. </tr>

  308. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.set_default_executor" title="asyncio.loop.set_default_executor"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.set_default_executor()</span></code></a></p></td>

  309. <td><p>Set the default executor for <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.run_in_executor" title="asyncio.loop.run_in_executor"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.run_in_executor()</span></code></a>.</p></td>

  310. </tr>

  311. </tbody>

  312. </table>

  313. <p class="rubric">Tasks and Futures</p>

  314. <table class="full-width-table docutils align-default">

  315. <colgroup>

  316. <col style="width: 50.0%" />

  317. <col style="width: 50.0%" />

  318. </colgroup>

  319. <tbody>

  320. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_future" title="asyncio.loop.create_future"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_future()</span></code></a></p></td>

  321. <td><p>Create a <a class="reference internal" href="asyncio-future.html#asyncio.Future" title="asyncio.Future"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a> object.</p></td>

  322. </tr>

  323. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_task" title="asyncio.loop.create_task"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_task()</span></code></a></p></td>

  324. <td><p>Schedule coroutine as a <a class="reference internal" href="asyncio-task.html#asyncio.Task" title="asyncio.Task"><code class="xref py py-class docutils literal notranslate"><span class="pre">Task</span></code></a>.</p></td>

  325. </tr>

  326. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.set_task_factory" title="asyncio.loop.set_task_factory"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.set_task_factory()</span></code></a></p></td>

  327. <td><p>Set a factory used by <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_task" title="asyncio.loop.create_task"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_task()</span></code></a> to

  328. create <a class="reference internal" href="asyncio-task.html#asyncio.Task" title="asyncio.Task"><code class="xref py py-class docutils literal notranslate"><span class="pre">Tasks</span></code></a>.</p></td>

  329. </tr>

  330. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.get_task_factory" title="asyncio.loop.get_task_factory"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.get_task_factory()</span></code></a></p></td>

  331. <td><p>Get the factory <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_task" title="asyncio.loop.create_task"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_task()</span></code></a> uses

  332. to create <a class="reference internal" href="asyncio-task.html#asyncio.Task" title="asyncio.Task"><code class="xref py py-class docutils literal notranslate"><span class="pre">Tasks</span></code></a>.</p></td>

  333. </tr>

  334. </tbody>

  335. </table>

  336. <p class="rubric">DNS</p>

  337. <table class="full-width-table docutils align-default">

  338. <colgroup>

  339. <col style="width: 50.0%" />

  340. <col style="width: 50.0%" />

  341. </colgroup>

  342. <tbody>

  343. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.getaddrinfo" title="asyncio.loop.getaddrinfo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.getaddrinfo()</span></code></a></p></td>

  344. <td><p>Asynchronous version of <a class="reference internal" href="socket.html#socket.getaddrinfo" title="socket.getaddrinfo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">socket.getaddrinfo()</span></code></a>.</p></td>

  345. </tr>

  346. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.getnameinfo" title="asyncio.loop.getnameinfo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.getnameinfo()</span></code></a></p></td>

  347. <td><p>Asynchronous version of <a class="reference internal" href="socket.html#socket.getnameinfo" title="socket.getnameinfo"><code class="xref py py-meth docutils literal notranslate"><span class="pre">socket.getnameinfo()</span></code></a>.</p></td>

  348. </tr>

  349. </tbody>

  350. </table>

  351. <p class="rubric">Networking and IPC</p>

  352. <table class="full-width-table docutils align-default">

  353. <colgroup>

  354. <col style="width: 50.0%" />

  355. <col style="width: 50.0%" />

  356. </colgroup>

  357. <tbody>

  358. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_connection" title="asyncio.loop.create_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_connection()</span></code></a></p></td>

  359. <td><p>Open a TCP connection.</p></td>

  360. </tr>

  361. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_server" title="asyncio.loop.create_server"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_server()</span></code></a></p></td>

  362. <td><p>Create a TCP server.</p></td>

  363. </tr>

  364. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_unix_connection" title="asyncio.loop.create_unix_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_unix_connection()</span></code></a></p></td>

  365. <td><p>Open a Unix socket connection.</p></td>

  366. </tr>

  367. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_unix_server" title="asyncio.loop.create_unix_server"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_unix_server()</span></code></a></p></td>

  368. <td><p>Create a Unix socket server.</p></td>

  369. </tr>

  370. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_accepted_socket" title="asyncio.loop.connect_accepted_socket"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_accepted_socket()</span></code></a></p></td>

  371. <td><p>Wrap a <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a> into a <code class="docutils literal notranslate"><span class="pre">(transport,</span> <span class="pre">protocol)</span></code>

  372. pair.</p></td>

  373. </tr>

  374. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_datagram_endpoint" title="asyncio.loop.create_datagram_endpoint"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_datagram_endpoint()</span></code></a></p></td>

  375. <td><p>Open a datagram (UDP) connection.</p></td>

  376. </tr>

  377. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sendfile" title="asyncio.loop.sendfile"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sendfile()</span></code></a></p></td>

  378. <td><p>Send a file over a transport.</p></td>

  379. </tr>

  380. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.start_tls" title="asyncio.loop.start_tls"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.start_tls()</span></code></a></p></td>

  381. <td><p>Upgrade an existing connection to TLS.</p></td>

  382. </tr>

  383. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_read_pipe" title="asyncio.loop.connect_read_pipe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_read_pipe()</span></code></a></p></td>

  384. <td><p>Wrap a read end of a pipe into a <code class="docutils literal notranslate"><span class="pre">(transport,</span> <span class="pre">protocol)</span></code> pair.</p></td>

  385. </tr>

  386. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_write_pipe" title="asyncio.loop.connect_write_pipe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_write_pipe()</span></code></a></p></td>

  387. <td><p>Wrap a write end of a pipe into a <code class="docutils literal notranslate"><span class="pre">(transport,</span> <span class="pre">protocol)</span></code> pair.</p></td>

  388. </tr>

  389. </tbody>

  390. </table>

  391. <p class="rubric">Sockets</p>

  392. <table class="full-width-table docutils align-default">

  393. <colgroup>

  394. <col style="width: 50.0%" />

  395. <col style="width: 50.0%" />

  396. </colgroup>

  397. <tbody>

  398. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_recv" title="asyncio.loop.sock_recv"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_recv()</span></code></a></p></td>

  399. <td><p>Receive data from the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a>.</p></td>

  400. </tr>

  401. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_recv_into" title="asyncio.loop.sock_recv_into"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_recv_into()</span></code></a></p></td>

  402. <td><p>Receive data from the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a> into a buffer.</p></td>

  403. </tr>

  404. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_recvfrom" title="asyncio.loop.sock_recvfrom"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_recvfrom()</span></code></a></p></td>

  405. <td><p>Receive a datagram from the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a>.</p></td>

  406. </tr>

  407. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_recvfrom_into" title="asyncio.loop.sock_recvfrom_into"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_recvfrom_into()</span></code></a></p></td>

  408. <td><p>Receive a datagram from the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a> into a buffer.</p></td>

  409. </tr>

  410. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_sendall" title="asyncio.loop.sock_sendall"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_sendall()</span></code></a></p></td>

  411. <td><p>Send data to the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a>.</p></td>

  412. </tr>

  413. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_sendto" title="asyncio.loop.sock_sendto"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_sendto()</span></code></a></p></td>

  414. <td><p>Send a datagram via the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a> to the given address.</p></td>

  415. </tr>

  416. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_connect" title="asyncio.loop.sock_connect"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_connect()</span></code></a></p></td>

  417. <td><p>Connect the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a>.</p></td>

  418. </tr>

  419. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_accept" title="asyncio.loop.sock_accept"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_accept()</span></code></a></p></td>

  420. <td><p>Accept a <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a> connection.</p></td>

  421. </tr>

  422. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">await</span></code> <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.sock_sendfile" title="asyncio.loop.sock_sendfile"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.sock_sendfile()</span></code></a></p></td>

  423. <td><p>Send a file over the <a class="reference internal" href="socket.html#socket.socket" title="socket.socket"><code class="xref py py-class docutils literal notranslate"><span class="pre">socket</span></code></a>.</p></td>

  424. </tr>

  425. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_reader" title="asyncio.loop.add_reader"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_reader()</span></code></a></p></td>

  426. <td><p>Start watching a file descriptor for read availability.</p></td>

  427. </tr>

  428. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.remove_reader" title="asyncio.loop.remove_reader"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.remove_reader()</span></code></a></p></td>

  429. <td><p>Stop watching a file descriptor for read availability.</p></td>

  430. </tr>

  431. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_writer" title="asyncio.loop.add_writer"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_writer()</span></code></a></p></td>

  432. <td><p>Start watching a file descriptor for write availability.</p></td>

  433. </tr>

  434. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.remove_writer" title="asyncio.loop.remove_writer"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.remove_writer()</span></code></a></p></td>

  435. <td><p>Stop watching a file descriptor for write availability.</p></td>

  436. </tr>

  437. </tbody>

  438. </table>

  439. <p class="rubric">Unix Signals</p>

  440. <table class="full-width-table docutils align-default">

  441. <colgroup>

  442. <col style="width: 50.0%" />

  443. <col style="width: 50.0%" />

  444. </colgroup>

  445. <tbody>

  446. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.add_signal_handler" title="asyncio.loop.add_signal_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.add_signal_handler()</span></code></a></p></td>

  447. <td><p>Add a handler for a <a class="reference internal" href="signal.html#module-signal" title="signal: Set handlers for asynchronous events."><code class="xref py py-mod docutils literal notranslate"><span class="pre">signal</span></code></a>.</p></td>

  448. </tr>

  449. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.remove_signal_handler" title="asyncio.loop.remove_signal_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.remove_signal_handler()</span></code></a></p></td>

  450. <td><p>Remove a handler for a <a class="reference internal" href="signal.html#module-signal" title="signal: Set handlers for asynchronous events."><code class="xref py py-mod docutils literal notranslate"><span class="pre">signal</span></code></a>.</p></td>

  451. </tr>

  452. </tbody>

  453. </table>

  454. <p class="rubric">Subprocesses</p>

  455. <table class="full-width-table docutils align-default">

  456. <colgroup>

  457. <col style="width: 50.0%" />

  458. <col style="width: 50.0%" />

  459. </colgroup>

  460. <tbody>

  461. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.subprocess_exec" title="asyncio.loop.subprocess_exec"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.subprocess_exec()</span></code></a></p></td>

  462. <td><p>Spawn a subprocess.</p></td>

  463. </tr>

  464. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.subprocess_shell" title="asyncio.loop.subprocess_shell"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.subprocess_shell()</span></code></a></p></td>

  465. <td><p>Spawn a subprocess from a shell command.</p></td>

  466. </tr>

  467. </tbody>

  468. </table>

  469. <p class="rubric">Error Handling</p>

  470. <table class="full-width-table docutils align-default">

  471. <colgroup>

  472. <col style="width: 50.0%" />

  473. <col style="width: 50.0%" />

  474. </colgroup>

  475. <tbody>

  476. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.call_exception_handler" title="asyncio.loop.call_exception_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.call_exception_handler()</span></code></a></p></td>

  477. <td><p>Call the exception handler.</p></td>

  478. </tr>

  479. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.set_exception_handler" title="asyncio.loop.set_exception_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.set_exception_handler()</span></code></a></p></td>

  480. <td><p>Set a new exception handler.</p></td>

  481. </tr>

  482. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.get_exception_handler" title="asyncio.loop.get_exception_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.get_exception_handler()</span></code></a></p></td>

  483. <td><p>Get the current exception handler.</p></td>

  484. </tr>

  485. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.default_exception_handler" title="asyncio.loop.default_exception_handler"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.default_exception_handler()</span></code></a></p></td>

  486. <td><p>The default exception handler implementation.</p></td>

  487. </tr>

  488. </tbody>

  489. </table>

  490. <p class="rubric">Examples</p>

  491. <ul class="simple">

  492. <li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio-example-lowlevel-helloworld"><span class="std std-ref">Using asyncio.new_event_loop() and loop.run_forever()</span></a>.</p></li>

  493. <li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio-example-call-later"><span class="std std-ref">Using loop.call_later()</span></a>.</p></li>

  494. <li><p>Using <code class="docutils literal notranslate"><span class="pre">loop.create_connection()</span></code> to implement

  495. <a class="reference internal" href="asyncio-protocol.html#asyncio-example-tcp-echo-client-protocol"><span class="std std-ref">an echo-client</span></a>.</p></li>

  496. <li><p>Using <code class="docutils literal notranslate"><span class="pre">loop.create_connection()</span></code> to

  497. <a class="reference internal" href="asyncio-protocol.html#asyncio-example-create-connection"><span class="std std-ref">connect a socket</span></a>.</p></li>

  498. <li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio-example-watch-fd"><span class="std std-ref">Using add_reader() to watch an FD for read events</span></a>.</p></li>

  499. <li><p><a class="reference internal" href="asyncio-eventloop.html#asyncio-example-unix-signals"><span class="std std-ref">Using loop.add_signal_handler()</span></a>.</p></li>

  500. <li><p><a class="reference internal" href="asyncio-protocol.html#asyncio-example-subprocess-proto"><span class="std std-ref">Using loop.subprocess_exec()</span></a>.</p></li>

  501. </ul>

  502. </section>

  503. <section id="transports">

  504. <h2>Transports<a class="headerlink" href="#transports" title="Link to this heading">¶</a></h2>

  505. <p>All transports implement the following methods:</p>

  506. <table class="full-width-table docutils align-default">

  507. <colgroup>

  508. <col style="width: 50.0%" />

  509. <col style="width: 50.0%" />

  510. </colgroup>

  511. <tbody>

  512. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.BaseTransport.close" title="asyncio.BaseTransport.close"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.close()</span></code></a></p></td>

  513. <td><p>Close the transport.</p></td>

  514. </tr>

  515. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.BaseTransport.is_closing" title="asyncio.BaseTransport.is_closing"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.is_closing()</span></code></a></p></td>

  516. <td><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the transport is closing or is closed.</p></td>

  517. </tr>

  518. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.BaseTransport.get_extra_info" title="asyncio.BaseTransport.get_extra_info"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_extra_info()</span></code></a></p></td>

  519. <td><p>Request for information about the transport.</p></td>

  520. </tr>

  521. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.BaseTransport.set_protocol" title="asyncio.BaseTransport.set_protocol"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.set_protocol()</span></code></a></p></td>

  522. <td><p>Set a new protocol.</p></td>

  523. </tr>

  524. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.BaseTransport.get_protocol" title="asyncio.BaseTransport.get_protocol"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_protocol()</span></code></a></p></td>

  525. <td><p>Return the current protocol.</p></td>

  526. </tr>

  527. </tbody>

  528. </table>

  529. <p>Transports that can receive data (TCP and Unix connections,

  530. pipes, etc).  Returned from methods like

  531. <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_connection" title="asyncio.loop.create_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_connection()</span></code></a>, <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_unix_connection" title="asyncio.loop.create_unix_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_unix_connection()</span></code></a>,

  532. <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_read_pipe" title="asyncio.loop.connect_read_pipe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_read_pipe()</span></code></a>, etc:</p>

  533. <p class="rubric">Read Transports</p>

  534. <table class="full-width-table docutils align-default">

  535. <colgroup>

  536. <col style="width: 50.0%" />

  537. <col style="width: 50.0%" />

  538. </colgroup>

  539. <tbody>

  540. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.ReadTransport.is_reading" title="asyncio.ReadTransport.is_reading"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.is_reading()</span></code></a></p></td>

  541. <td><p>Return <code class="docutils literal notranslate"><span class="pre">True</span></code> if the transport is receiving.</p></td>

  542. </tr>

  543. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.ReadTransport.pause_reading" title="asyncio.ReadTransport.pause_reading"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.pause_reading()</span></code></a></p></td>

  544. <td><p>Pause receiving.</p></td>

  545. </tr>

  546. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.ReadTransport.resume_reading" title="asyncio.ReadTransport.resume_reading"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.resume_reading()</span></code></a></p></td>

  547. <td><p>Resume receiving.</p></td>

  548. </tr>

  549. </tbody>

  550. </table>

  551. <p>Transports that can Send data (TCP and Unix connections,

  552. pipes, etc).  Returned from methods like

  553. <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_connection" title="asyncio.loop.create_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_connection()</span></code></a>, <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_unix_connection" title="asyncio.loop.create_unix_connection"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_unix_connection()</span></code></a>,

  554. <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.connect_write_pipe" title="asyncio.loop.connect_write_pipe"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.connect_write_pipe()</span></code></a>, etc:</p>

  555. <p class="rubric">Write Transports</p>

  556. <table class="full-width-table docutils align-default">

  557. <colgroup>

  558. <col style="width: 50.0%" />

  559. <col style="width: 50.0%" />

  560. </colgroup>

  561. <tbody>

  562. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.write" title="asyncio.WriteTransport.write"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.write()</span></code></a></p></td>

  563. <td><p>Write data to the transport.</p></td>

  564. </tr>

  565. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.writelines" title="asyncio.WriteTransport.writelines"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.writelines()</span></code></a></p></td>

  566. <td><p>Write buffers to the transport.</p></td>

  567. </tr>

  568. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.can_write_eof" title="asyncio.WriteTransport.can_write_eof"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.can_write_eof()</span></code></a></p></td>

  569. <td><p>Return <a class="reference internal" href="constants.html#True" title="True"><code class="xref py py-const docutils literal notranslate"><span class="pre">True</span></code></a> if the transport supports sending EOF.</p></td>

  570. </tr>

  571. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.write_eof" title="asyncio.WriteTransport.write_eof"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.write_eof()</span></code></a></p></td>

  572. <td><p>Close and send EOF after flushing buffered data.</p></td>

  573. </tr>

  574. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.abort" title="asyncio.WriteTransport.abort"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.abort()</span></code></a></p></td>

  575. <td><p>Close the transport immediately.</p></td>

  576. </tr>

  577. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.get_write_buffer_size" title="asyncio.WriteTransport.get_write_buffer_size"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_write_buffer_size()</span></code></a></p></td>

  578. <td><p>Return the current size of the output buffer.</p></td>

  579. </tr>

  580. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.get_write_buffer_limits" title="asyncio.WriteTransport.get_write_buffer_limits"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_write_buffer_limits()</span></code></a></p></td>

  581. <td><p>Return high and low water marks for write flow control.</p></td>

  582. </tr>

  583. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.WriteTransport.set_write_buffer_limits" title="asyncio.WriteTransport.set_write_buffer_limits"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.set_write_buffer_limits()</span></code></a></p></td>

  584. <td><p>Set new high and low water marks for write flow control.</p></td>

  585. </tr>

  586. </tbody>

  587. </table>

  588. <p>Transports returned by <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.create_datagram_endpoint" title="asyncio.loop.create_datagram_endpoint"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.create_datagram_endpoint()</span></code></a>:</p>

  589. <p class="rubric">Datagram Transports</p>

  590. <table class="full-width-table docutils align-default">

  591. <colgroup>

  592. <col style="width: 50.0%" />

  593. <col style="width: 50.0%" />

  594. </colgroup>

  595. <tbody>

  596. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.DatagramTransport.sendto" title="asyncio.DatagramTransport.sendto"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.sendto()</span></code></a></p></td>

  597. <td><p>Send data to the remote peer.</p></td>

  598. </tr>

  599. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.DatagramTransport.abort" title="asyncio.DatagramTransport.abort"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.abort()</span></code></a></p></td>

  600. <td><p>Close the transport immediately.</p></td>

  601. </tr>

  602. </tbody>

  603. </table>

  604. <p>Low-level transport abstraction over subprocesses.

  605. Returned by <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.subprocess_exec" title="asyncio.loop.subprocess_exec"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.subprocess_exec()</span></code></a> and

  606. <a class="reference internal" href="asyncio-eventloop.html#asyncio.loop.subprocess_shell" title="asyncio.loop.subprocess_shell"><code class="xref py py-meth docutils literal notranslate"><span class="pre">loop.subprocess_shell()</span></code></a>:</p>

  607. <p class="rubric">Subprocess Transports</p>

  608. <table class="full-width-table docutils align-default">

  609. <colgroup>

  610. <col style="width: 50.0%" />

  611. <col style="width: 50.0%" />

  612. </colgroup>

  613. <tbody>

  614. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.get_pid" title="asyncio.SubprocessTransport.get_pid"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_pid()</span></code></a></p></td>

  615. <td><p>Return the subprocess process id.</p></td>

  616. </tr>

  617. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.get_pipe_transport" title="asyncio.SubprocessTransport.get_pipe_transport"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_pipe_transport()</span></code></a></p></td>

  618. <td><p>Return the transport for the requested communication pipe

  619. (<em>stdin</em>, <em>stdout</em>, or <em>stderr</em>).</p></td>

  620. </tr>

  621. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.get_returncode" title="asyncio.SubprocessTransport.get_returncode"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.get_returncode()</span></code></a></p></td>

  622. <td><p>Return the subprocess return code.</p></td>

  623. </tr>

  624. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.kill" title="asyncio.SubprocessTransport.kill"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.kill()</span></code></a></p></td>

  625. <td><p>Kill the subprocess.</p></td>

  626. </tr>

  627. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.send_signal" title="asyncio.SubprocessTransport.send_signal"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.send_signal()</span></code></a></p></td>

  628. <td><p>Send a signal to the subprocess.</p></td>

  629. </tr>

  630. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.terminate" title="asyncio.SubprocessTransport.terminate"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.terminate()</span></code></a></p></td>

  631. <td><p>Stop the subprocess.</p></td>

  632. </tr>

  633. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessTransport.close" title="asyncio.SubprocessTransport.close"><code class="xref py py-meth docutils literal notranslate"><span class="pre">transport.close()</span></code></a></p></td>

  634. <td><p>Kill the subprocess and close all pipes.</p></td>

  635. </tr>

  636. </tbody>

  637. </table>

  638. </section>

  639. <section id="protocols">

  640. <h2>Protocols<a class="headerlink" href="#protocols" title="Link to this heading">¶</a></h2>

  641. <p>Protocol classes can implement the following <strong>callback methods</strong>:</p>

  642. <table class="full-width-table docutils align-default">

  643. <colgroup>

  644. <col style="width: 50.0%" />

  645. <col style="width: 50.0%" />

  646. </colgroup>

  647. <tbody>

  648. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BaseProtocol.connection_made" title="asyncio.BaseProtocol.connection_made"><code class="xref py py-meth docutils literal notranslate"><span class="pre">connection_made()</span></code></a></p></td>

  649. <td><p>Called when a connection is made.</p></td>

  650. </tr>

  651. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BaseProtocol.connection_lost" title="asyncio.BaseProtocol.connection_lost"><code class="xref py py-meth docutils literal notranslate"><span class="pre">connection_lost()</span></code></a></p></td>

  652. <td><p>Called when the connection is lost or closed.</p></td>

  653. </tr>

  654. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BaseProtocol.pause_writing" title="asyncio.BaseProtocol.pause_writing"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pause_writing()</span></code></a></p></td>

  655. <td><p>Called when the transport’s buffer goes over the high water mark.</p></td>

  656. </tr>

  657. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BaseProtocol.resume_writing" title="asyncio.BaseProtocol.resume_writing"><code class="xref py py-meth docutils literal notranslate"><span class="pre">resume_writing()</span></code></a></p></td>

  658. <td><p>Called when the transport’s buffer drains below the low water mark.</p></td>

  659. </tr>

  660. </tbody>

  661. </table>

  662. <p class="rubric">Streaming Protocols (TCP, Unix Sockets, Pipes)</p>

  663. <table class="full-width-table docutils align-default">

  664. <colgroup>

  665. <col style="width: 50.0%" />

  666. <col style="width: 50.0%" />

  667. </colgroup>

  668. <tbody>

  669. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.Protocol.data_received" title="asyncio.Protocol.data_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">data_received()</span></code></a></p></td>

  670. <td><p>Called when some data is received.</p></td>

  671. </tr>

  672. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.Protocol.eof_received" title="asyncio.Protocol.eof_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">eof_received()</span></code></a></p></td>

  673. <td><p>Called when an EOF is received.</p></td>

  674. </tr>

  675. </tbody>

  676. </table>

  677. <p class="rubric">Buffered Streaming Protocols</p>

  678. <table class="full-width-table docutils align-default">

  679. <colgroup>

  680. <col style="width: 50.0%" />

  681. <col style="width: 50.0%" />

  682. </colgroup>

  683. <tbody>

  684. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BufferedProtocol.get_buffer" title="asyncio.BufferedProtocol.get_buffer"><code class="xref py py-meth docutils literal notranslate"><span class="pre">get_buffer()</span></code></a></p></td>

  685. <td><p>Called to allocate a new receive buffer.</p></td>

  686. </tr>

  687. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BufferedProtocol.buffer_updated" title="asyncio.BufferedProtocol.buffer_updated"><code class="xref py py-meth docutils literal notranslate"><span class="pre">buffer_updated()</span></code></a></p></td>

  688. <td><p>Called when the buffer was updated with the received data.</p></td>

  689. </tr>

  690. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.BufferedProtocol.eof_received" title="asyncio.BufferedProtocol.eof_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">eof_received()</span></code></a></p></td>

  691. <td><p>Called when an EOF is received.</p></td>

  692. </tr>

  693. </tbody>

  694. </table>

  695. <p class="rubric">Datagram Protocols</p>

  696. <table class="full-width-table docutils align-default">

  697. <colgroup>

  698. <col style="width: 50.0%" />

  699. <col style="width: 50.0%" />

  700. </colgroup>

  701. <tbody>

  702. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.DatagramProtocol.datagram_received" title="asyncio.DatagramProtocol.datagram_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">datagram_received()</span></code></a></p></td>

  703. <td><p>Called when a datagram is received.</p></td>

  704. </tr>

  705. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.DatagramProtocol.error_received" title="asyncio.DatagramProtocol.error_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">error_received()</span></code></a></p></td>

  706. <td><p>Called when a previous send or receive operation raises an

  707. <a class="reference internal" href="exceptions.html#OSError" title="OSError"><code class="xref py py-class docutils literal notranslate"><span class="pre">OSError</span></code></a>.</p></td>

  708. </tr>

  709. </tbody>

  710. </table>

  711. <p class="rubric">Subprocess Protocols</p>

  712. <table class="full-width-table docutils align-default">

  713. <colgroup>

  714. <col style="width: 50.0%" />

  715. <col style="width: 50.0%" />

  716. </colgroup>

  717. <tbody>

  718. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessProtocol.pipe_data_received" title="asyncio.SubprocessProtocol.pipe_data_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pipe_data_received()</span></code></a></p></td>

  719. <td><p>Called when the child process writes data into its

  720. <em>stdout</em> or <em>stderr</em> pipe.</p></td>

  721. </tr>

  722. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessProtocol.pipe_connection_lost" title="asyncio.SubprocessProtocol.pipe_connection_lost"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pipe_connection_lost()</span></code></a></p></td>

  723. <td><p>Called when one of the pipes communicating with

  724. the child process is closed.</p></td>

  725. </tr>

  726. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">callback</span></code> <a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessProtocol.process_exited" title="asyncio.SubprocessProtocol.process_exited"><code class="xref py py-meth docutils literal notranslate"><span class="pre">process_exited()</span></code></a></p></td>

  727. <td><p>Called when the child process has exited. It can be called before

  728. <a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessProtocol.pipe_data_received" title="asyncio.SubprocessProtocol.pipe_data_received"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pipe_data_received()</span></code></a> and

  729. <a class="reference internal" href="asyncio-protocol.html#asyncio.SubprocessProtocol.pipe_connection_lost" title="asyncio.SubprocessProtocol.pipe_connection_lost"><code class="xref py py-meth docutils literal notranslate"><span class="pre">pipe_connection_lost()</span></code></a> methods.</p></td>

  730. </tr>

  731. </tbody>

  732. </table>

  733. </section>

  734. <section id="event-loop-policies">

  735. <h2>Event Loop Policies<a class="headerlink" href="#event-loop-policies" title="Link to this heading">¶</a></h2>

  736. <p>Policies is a low-level mechanism to alter the behavior of

  737. functions like <a class="reference internal" href="asyncio-eventloop.html#asyncio.get_event_loop" title="asyncio.get_event_loop"><code class="xref py py-func docutils literal notranslate"><span class="pre">asyncio.get_event_loop()</span></code></a>.  See also

  738. the main <a class="reference internal" href="asyncio-policy.html#asyncio-policies"><span class="std std-ref">policies section</span></a> for more

  739. details.</p>

  740. <p class="rubric">Accessing Policies</p>

  741. <table class="full-width-table docutils align-default">

  742. <colgroup>

  743. <col style="width: 50.0%" />

  744. <col style="width: 50.0%" />

  745. </colgroup>

  746. <tbody>

  747. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-policy.html#asyncio.get_event_loop_policy" title="asyncio.get_event_loop_policy"><code class="xref py py-meth docutils literal notranslate"><span class="pre">asyncio.get_event_loop_policy()</span></code></a></p></td>

  748. <td><p>Return the current process-wide policy.</p></td>

  749. </tr>

  750. <tr class="row-even"><td><p><a class="reference internal" href="asyncio-policy.html#asyncio.set_event_loop_policy" title="asyncio.set_event_loop_policy"><code class="xref py py-meth docutils literal notranslate"><span class="pre">asyncio.set_event_loop_policy()</span></code></a></p></td>

  751. <td><p>Set a new process-wide policy.</p></td>

  752. </tr>

  753. <tr class="row-odd"><td><p><a class="reference internal" href="asyncio-policy.html#asyncio.AbstractEventLoopPolicy" title="asyncio.AbstractEventLoopPolicy"><code class="xref py py-class docutils literal notranslate"><span class="pre">AbstractEventLoopPolicy</span></code></a></p></td>

  754. <td><p>Base class for policy objects.</p></td>

  755. </tr>

  756. </tbody>

  757. </table>

  758. </section>

  759. </section>

  760. 

  761. 

  762.             <div class="clearer"></div>

  763.           </div>

  764.         </div>

  765.       </div>

  766.       <div class="sphinxsidebar" role="navigation" aria-label="main navigation">

  767.         <div class="sphinxsidebarwrapper">

  768.   <div>

  769.     <h3><a href="../contents.html">Table of Contents</a></h3>

  770.     <ul>

  771. <li><a class="reference internal" href="#">Low-level API Index</a><ul>

  772. <li><a class="reference internal" href="#obtaining-the-event-loop">Obtaining the Event Loop</a></li>

  773. <li><a class="reference internal" href="#event-loop-methods">Event Loop Methods</a></li>

  774. <li><a class="reference internal" href="#transports">Transports</a></li>

  775. <li><a class="reference internal" href="#protocols">Protocols</a></li>

  776. <li><a class="reference internal" href="#event-loop-policies">Event Loop Policies</a></li>

  777. </ul>

  778. </li>

  779. </ul>

  780. 

  781.   </div>

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