{"id":5000,"date":"2021-01-26T16:41:37","date_gmt":"2021-01-26T08:41:37","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5000"},"modified":"2021-01-26T16:41:37","modified_gmt":"2021-01-26T08:41:37","slug":"python%e5%8d%8f%e7%a8%8b%e7%b3%bb%e5%88%97%ef%bc%88%e5%85%ad%ef%bc%89-asyncio%e7%9a%84eventloop%e4%bb%a5%e5%8f%8afuture%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5000","title":{"rendered":"python\u534f\u7a0b\u7cfb\u5217\uff08\u516d\uff09\u2014\u2014asyncio\u7684EventLoop\u4ee5\u53caFuture\u8be6\u89e3"},"content":{"rendered":"
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<\/div>\n<\/div>\n<\/div>\n
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\u539f\u6587\u5730\u5740<\/a><\/p>\n

 <\/p>\n

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\u58f0\u660e\uff1a<\/strong>python\u534f\u7a0b\u7cfb\u5217\u6587\u7ae0\u7684\u4e0a\u4e00\u7bc7\uff0c\u5373\u7b2c\u4e94\u7bc7\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86asyncio\u7684\u6838\u5fc3\u6982\u5ff5\uff0casyncio\u7684\u8bbe\u8ba1\u67b6\u6784\uff0cTask\u7c7b\u7684\u8be6\u7ec6\u4f5c\u7528\uff0c\u672c\u6587\u4e3a\u7cfb\u5217\u6587\u7ae0\u7684\u7b2c\u516d\u7bc7\uff0c\u5c06\u4ecb\u7ecd\u66f4\u52a0\u5e95\u5c42\u7684API\uff0c\u4ee5EventLoop\u548cFuture\u4e3a\u4e3b\uff0c\u4ecb\u7ecd\u4ed6\u4eec\u7684\u8bbe\u8ba1\u7406\u5ff5\uff0c\u5305\u542b\u7684\u65b9\u6cd5\u4ee5\u53ca\u4f7f\u7528\u6280\u5de7\u3002<\/p>\n

\u4e00\u3001\u4e8b\u4ef6\u5faa\u73afEventLoop<\/h2>\n

\u4e8b\u4ef6\u5faa\u73af\u662fasyncio\u7684\u6838\u5fc3\uff0c\u5f02\u6b65\u4efb\u52a1\u7684\u8fd0\u884c\u3001\u4efb\u52a1\u5b8c\u6210\u4e4b\u540e\u7684\u56de\u8c03\u3001\u7f51\u7edcIO\u64cd\u4f5c\u3001\u5b50\u8fdb\u7a0b\u7684\u8fd0\u884c\uff0c\u90fd\u662f\u901a\u8fc7\u4e8b\u4ef6\u5faa\u73af\u5b8c\u6210\u7684\u3002\u5728\u524d\u4e00\u7bc7\u6587\u7ae0\u4e2d\uff0c\u5df2\u7ecf\u63d0\u5230\u8fc7\uff0c\u5728python3.7\u4e2d\uff0c\u6211\u4eec\u751a\u81f3\u5b8c\u5168\u4e0d\u7528\u7ba1\u4e8b\u4ef6\u5faa\u73af\uff0c\u53ea\u9700\u8981\u4f7f\u7528\u9ad8\u5c42API\uff0c\u5373asyncio\u4e2d\u7684\u65b9\u6cd5\uff0c\u6211\u4eec\u5f88\u5c11\u76f4\u63a5\u4e0e\u4e8b\u4ef6\u5faa\u73af\u6253\u4ea4\u9053\uff0c\u4f46\u662f\u4e3a\u4e86\u66f4\u52a0\u719f\u6089asyncio\u7684\u8fd0\u884c\u539f\u7406\uff0c\u6700\u597d\u8fd8\u662f\u4e86\u89e3EventLoop\u7684\u8bbe\u8ba1\u539f\u7406\u3002<\/p>\n

1\u3001\u4e8b\u4ef6\u5faa\u73af\u7684\u521b\u5efa\u3001\u83b7\u53d6\u3001\u8bbe\u7f6e\uff08\u4e0a\u6587\u5df2\u7ecf\u4ecb\u7ecd\u8fc7\u4e86\uff09<\/strong><\/p>\n

\uff081\uff09asyncio.<\/code>get_running_loop<\/code>()\u3002python3.7\u65b0\u6dfb\u52a0\u7684<\/p>\n

\uff082\uff09asyncio.<\/code>get_event_loop<\/code>()<\/p>\n

\uff083\uff09asyncio.set_event_loop<\/code>(loop<\/em>)<\/p>\n

\uff084\uff09asyncio.<\/code>new_event_loop<\/code>()<\/p>\n

2\u3001\u8fd0\u884c\u548c\u505c\u6b62\u4e8b\u4ef6\u5faa\u73af<\/strong><\/p>\n

\uff081\uff09loop.<\/code>run_until_complete<\/code>(future<\/em>)\u3002\u8fd0\u884c\u4e8b\u4ef6\u5faa\u73af\uff0c\u76f4\u5230future\u8fd0\u884c\u7ed3\u675f<\/p>\n

\uff082\uff09loop.<\/code>run_forever<\/code>()\u3002\u5728python3.7\u4e2d\u5df2\u7ecf\u53d6\u6d88\u4e86\uff0c\u8868\u793a\u4e8b\u4ef6\u5faa\u73af\u4f1a\u4e00\u76f4\u8fd0\u884c\uff0c\u76f4\u5230\u9047\u5230stop\u3002<\/p>\n

\uff083\uff09loop.<\/code>stop<\/code>()\u3002\u505c\u6b62\u4e8b\u4ef6\u5faa\u73af<\/p>\n

\uff084\uff09loop.<\/code>is_running<\/code>()\u3002\u5982\u679c\u4e8b\u4ef6\u5faa\u73af\u4f9d\u7136\u5728\u8fd0\u884c\uff0c\u5219\u8fd4\u56deTrue<\/p>\n

\uff085\uff09loop.<\/code>is_closed<\/code>()\u3002\u5982\u679c\u4e8b\u4ef6\u5faa\u73af\u5df2\u7ecfclose\uff0c\u5219\u8fd4\u56deTrue<\/p>\n

\uff086\uff09loop.<\/code>close<\/code>()\u3002\u5173\u95ed\u4e8b\u4ef6\u5faa\u73af<\/p>\n

3\u3001\u521b\u5efaFuture\u548cTask<\/strong><\/p>\n

\uff081\uff09loop.<\/code>create_future<\/code>(coroutine) \uff0c\u8fd4\u56defuture\u5bf9\u8c61<\/p>\n

\uff082\uff09loop.<\/code>create_task<\/code>(corootine<\/em>) \uff0c\u8fd4\u56detask\u5bf9\u8c61<\/p>\n

\uff083\uff09loop.<\/code>set_task_factory<\/code>(factory<\/em>)<\/p>\n

\uff084\uff09loop.<\/code>get_task_factory<\/code>()<\/p>\n

4\u3001\u4e8b\u4ef6\u5faa\u73af\u7684\u65f6\u949f<\/strong><\/p>\n

loop.time()\u3002\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3\uff0c\u4e8b\u4ef6\u5faa\u73af\u5185\u90e8\u4e5f\u7ef4\u62a4\u7740\u4e00\u4e2a\u65f6\u949f\uff0c\u53ef\u4ee5\u67e5\u770b\u4e8b\u4ef6\u5faa\u73af\u73b0\u5728\u8fd0\u884c\u7684\u65f6\u95f4\u70b9\u662f\u591a\u5c11\uff0c\u5c31\u50cf\u666e\u901a\u7684time.time()\u7c7b\u4f3c\uff0c\u5b83\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u6d6e\u70b9\u6570\u503c\uff0c\u6bd4\u5982\u4e0b\u9762\u7684\u4ee3\u7801\u3002<\/p>\n

    \n
  1. \n
    \n
    <\/div>\n<\/div>\n
    \n
    import<\/span> asyncio<\/div>\n<\/div>\n<\/li>\n
  2. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  3. \n
    \n
    <\/div>\n<\/div>\n
    \n
    async<\/span> def<\/span> hello1<\/span>(a,b<\/span>):<\/span><\/div>\n<\/div>\n<\/li>\n
  4. \n
    \n
    <\/div>\n<\/div>\n
    \n
    print(‘\u51c6\u5907\u505a\u52a0\u6cd5\u8fd0\u7b97’<\/span>)<\/div>\n<\/div>\n<\/li>\n
  5. \n
    \n
    <\/div>\n<\/div>\n
    \n
    await<\/span> asyncio.sleep(3<\/span>)<\/div>\n<\/div>\n<\/li>\n
  6. \n
    \n
    <\/div>\n<\/div>\n
    \n
    return<\/span> a+b<\/div>\n<\/div>\n<\/li>\n
  7. \n
    \n
    <\/div>\n<\/div>\n
    \n
    <\/div>\n<\/div>\n<\/li>\n
  8. \n
    \n
    <\/div>\n<\/div>\n
    \n
    loop=asyncio.get_event_loop()<\/div>\n<\/div>\n<\/li>\n
  9. \n
    \n
    <\/div>\n<\/div>\n
    \n
    t1=loop.time() #\u5f00\u59cb\u65f6\u95f4<\/span><\/div>\n<\/div>\n<\/li>\n
  10. \n
    \n
    <\/div>\n<\/div>\n
    \n
    print(t1)<\/div>\n<\/div>\n<\/li>\n
  11. \n
    \n
    <\/div>\n<\/div>\n
    \n
    loop.run_until_complete(hello1(3<\/span>,4<\/span>))<\/div>\n<\/div>\n<\/li>\n
  12. \n
    \n
    <\/div>\n<\/div>\n
    \n
    t2=loop.time() #\u7ed3\u675f\u65f6\u95f4<\/span><\/div>\n<\/div>\n<\/li>\n
  13. \n
    \n
    <\/div>\n<\/div>\n
    \n
    print(t2)<\/div>\n<\/div>\n<\/li>\n
  14. \n
    \n
    <\/div>\n<\/div>\n
    \n
    print(t2-t1) #\u65f6\u95f4\u95f4\u9694<\/span><\/div>\n<\/div>\n<\/li>\n
  15. \n
    \n
    <\/div>\n<\/div>\n
    \n
    ”’\u8fd0\u884c\u7ed3\u679c\u4e3a\uff1a<\/span><\/div>\n<\/div>\n<\/li>\n
  16. \n
    \n
    <\/div>\n<\/div>\n
    \n
    28525.671<\/span><\/div>\n<\/div>\n<\/li>\n
  17. \n
    \n
    <\/div>\n<\/div>\n
    \n
    \u51c6\u5907\u505a\u52a0\u6cd5\u8fd0\u7b97<\/span><\/div>\n<\/div>\n<\/li>\n
  18. \n
    \n
    <\/div>\n<\/div>\n
    \n
    28528.703<\/span><\/div>\n<\/div>\n<\/li>\n
  19. \n
    \n
    <\/div>\n<\/div>\n
    \n
    3.0320000000028813<\/span><\/div>\n<\/div>\n<\/li>\n
  20. \n
    \n
    <\/div>\n<\/div>\n
    \n
    ”’<\/span><\/div>\n<\/div>\n<\/li>\n<\/ol>\n

    5\u3001\u8ba1\u5212\u6267\u884c\u56de\u8c03\u51fd\u6570\uff08CallBacks\uff09<\/strong><\/p>\n

    \uff081\uff09loop.call_later(delay<\/em>,\u00a0callback<\/em>,\u00a0*args<\/em>,\u00a0context=None<\/em>)<\/p>\n

    \u9996\u5148\u7b80\u5355\u7684\u8bf4\u4e00\u4e0b\u5b83\u7684\u542b\u4e49\uff0c\u5c31\u662f\u4e8b\u4ef6\u5faa\u73af\u5728delay\u591a\u957f\u65f6\u95f4\u4e4b\u540e\u624d\u6267\u884ccallback\u51fd\u6570\uff0c\u5b83\u7684\u8fd4\u56de\u503c\u662fasyncio.TimerHandle\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u5bf9\u8c61\u3002<\/p>\n

    \uff082\uff09loop.call_at(when<\/em>,\u00a0callback<\/em>,\u00a0*args<\/em>,\u00a0context=None<\/em>)<\/p>\n

    \u5373\u5728\u67d0\u4e00\u4e2a\u65f6\u523b\u8fdb\u884c\u8c03\u7528\u8ba1\u5212\u7684\u56de\u8c03\u51fd\u6570\uff0c\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e0d\u518d\u662fdelay\u800c\u662fwhen\uff0c\u8868\u793a\u4e00\u4e2a\u7edd\u5bf9\u7684\u65f6\u95f4\u70b9\uff0c\u7ed3\u5408\u524d\u9762\u7684loop.time\u4f7f\u7528\uff0c\u5b83\u7684\u4f7f\u7528\u65b9\u6cd5\u548ccall_later()\u5f88\u7c7b\u4f3c\u3002\u5b83\u7684\u8fd4\u56de\u503c\u662fasyncio.TimerHandle\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u5bf9\u8c61\u3002<\/p>\n

    \uff083\uff09loop.<\/code>call_soon<\/code>(callback<\/em>,\u00a0*args<\/em>,\u00a0context=None<\/em>)<\/p>\n

    \u5728\u4e0b\u4e00\u4e2a\u8fed\u4ee3\u7684\u65f6\u95f4\u5faa\u73af\u4e2d\u7acb\u523b\u8c03\u7528\u56de\u8c03\u51fd\u6570\uff0c\u7528\u6cd5\u540c\u4e0a\u9762\u3002\u5b83\u7684\u8fd4\u56de\u503c\u662fasyncio.Handle\u7c7b\u7684\u4e00\u4e2a\u5b9e\u4f8b\u5bf9\u8c61\u3002<\/p>\n

    \uff084\uff09loop.<\/code>call_soon_threadsafe<\/code>(callback<\/em>,\u00a0*args<\/em>,\u00a0context=None<\/em>)<\/p>\n

    \u8fd9\u662fcall_soon()\u51fd\u6570\u7684\u7ebf\u7a0b\u5b89\u5168\u7248\u672c\uff0c\u8ba1\u5212\u56de\u8c03\u51fd\u6570\u5fc5\u987b\u5728\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u4f7f\u7528\u3002<\/p>\n

    \u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/strong>\u4e0a\u9762\u7684\u51e0\u4e2a\u56de\u8c03\u51fd\u6570\u90fd\u53ea\u4f7f\u7528\u4e86\u201c\u4f4d\u7f6e\u53c2\u6570\u201d\u54e6\uff0casyncio\u4e2d\uff0c\u5927\u90e8\u5206\u7684\u8ba1\u5212\u56de\u8c03\u51fd\u6570\u90fd\u4e0d\u652f\u6301\u201c\u5173\u952e\u5b57\u53c2\u6570\u201d\uff0c\u5982\u679c\u662f\u60f3\u8981\u4f7f\u7528\u5173\u952e\u5b57\u53c2\u6570\uff0c\u5219\u63a8\u8350\u4f7f\u7528functools.aprtial()\u5bf9\u65b9\u6cd5\u8fdb\u4e00\u6b65\u5305\u88c5\uff0c\u8be6\u7ec6\u53ef\u4ee5\u53c2\u8003\u524d\u9762\u7684python\u6807\u51c6\u5e93\u7cfb\u5217\u6587\u7ae0\u3002<\/p>\n

    \u5982\uff1a<\/p>\n

      \n
    1. \n
      \n
      <\/div>\n<\/div>\n
      \n
      # will schedule “print(“Hello”, flush=True)”<\/span><\/div>\n<\/div>\n<\/li>\n
    2. \n
      \n
      <\/div>\n<\/div>\n
      \n
      loop.call_soon(<\/div>\n<\/div>\n<\/li>\n
    3. \n
      \n
      <\/div>\n<\/div>\n
      \n
      functools.partial(print<\/span>, “Hello”<\/span>, flush=True<\/span>))<\/div>\n<\/div>\n<\/li>\n<\/ol>\n

      \u4e0b\u9762\u6765\u770b\u4e00\u4e0b\u5177\u4f53\u7684\u4f7f\u7528\u4f8b\u5b50\u3002<\/p>\n

        \n
      1. \n
        \n
        <\/div>\n<\/div>\n
        \n
        import<\/span> asyncio<\/div>\n<\/div>\n<\/li>\n
      2. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      3. \n
        \n
        <\/div>\n<\/div>\n
        \n
        def<\/span> callback<\/span>(n<\/span>):<\/span><\/div>\n<\/div>\n<\/li>\n
      4. \n
        \n
        <\/div>\n<\/div>\n
        \n
        print(‘\u6211\u662f\u56de\u8c03\u51fd\u6570\uff0c\u53c2\u6570\u4e3a\uff1a {0} ‘<\/span>.format(n))<\/div>\n<\/div>\n<\/li>\n
      5. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      6. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      7. \n
        \n
        <\/div>\n<\/div>\n
        \n
        async<\/span> def<\/span> main<\/span>(loop<\/span>):<\/span><\/div>\n<\/div>\n<\/li>\n
      8. \n
        \n
        <\/div>\n<\/div>\n
        \n
        print(‘\u5728\u5f02\u6b65\u51fd\u6570\u4e2d\u6ce8\u518c\u56de\u8c03\u51fd\u6570’<\/span>)<\/div>\n<\/div>\n<\/li>\n
      9. \n
        \n
        <\/div>\n<\/div>\n
        \n
        loop.call_later(2<\/span>, callback, 1<\/span>)<\/div>\n<\/div>\n<\/li>\n
      10. \n
        \n
        <\/div>\n<\/div>\n
        \n
        loop.call_later(1<\/span>, callback, 2<\/span>)<\/div>\n<\/div>\n<\/li>\n
      11. \n
        \n
        <\/div>\n<\/div>\n
        \n
        loop.call_soon(callback, 3<\/span>)<\/div>\n<\/div>\n<\/li>\n
      12. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      13. \n
        \n
        <\/div>\n<\/div>\n
        \n
        await<\/span> asyncio.sleep(4<\/span>)<\/div>\n<\/div>\n<\/li>\n
      14. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      15. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      16. \n
        \n
        <\/div>\n<\/div>\n
        \n
        loop = asyncio.get_event_loop()<\/div>\n<\/div>\n<\/li>\n
      17. \n
        \n
        <\/div>\n<\/div>\n
        \n
        print(‘\u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af’<\/span>)<\/div>\n<\/div>\n<\/li>\n
      18. \n
        \n
        <\/div>\n<\/div>\n
        \n
        loop.run_until_complete(main(loop))<\/div>\n<\/div>\n<\/li>\n
      19. \n
        \n
        <\/div>\n<\/div>\n
        \n
        print(‘\u5173\u95ed\u4e8b\u4ef6\u5faa\u73af’<\/span>)<\/div>\n<\/div>\n<\/li>\n
      20. \n
        \n
        <\/div>\n<\/div>\n
        \n
        loop.close()<\/div>\n<\/div>\n<\/li>\n
      21. \n
        \n
        <\/div>\n<\/div>\n
        \n
        <\/div>\n<\/div>\n<\/li>\n
      22. \n
        \n
        <\/div>\n<\/div>\n
        \n
        ”’\u8fd0\u884c\u7ed3\u679c\u4e3a\uff1a<\/span><\/div>\n<\/div>\n<\/li>\n
      23. \n
        \n
        <\/div>\n<\/div>\n
        \n
        \u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af<\/span><\/div>\n<\/div>\n<\/li>\n
      24. \n
        \n
        <\/div>\n<\/div>\n
        \n
        \u5728\u5f02\u6b65\u51fd\u6570\u4e2d\u6ce8\u518c\u56de\u8c03\u51fd\u6570<\/span><\/div>\n<\/div>\n<\/li>\n
      25. \n
        \n
        <\/div>\n<\/div>\n
        \n
        \u6211\u662f\u56de\u8c03\u51fd\u6570\uff0c\u53c2\u6570\u4e3a\uff1a 3<\/span><\/div>\n<\/div>\n<\/li>\n
      26. \n
        \n
        <\/div>\n<\/div>\n
        \n
        \u6211\u662f\u56de\u8c03\u51fd\u6570\uff0c\u53c2\u6570\u4e3a\uff1a 2<\/span><\/div>\n<\/div>\n<\/li>\n
      27. \n
        \n
        <\/div>\n<\/div>\n
        \n
        \u6211\u662f\u56de\u8c03\u51fd\u6570\uff0c\u53c2\u6570\u4e3a\uff1a 1<\/span><\/div>\n<\/div>\n<\/li>\n
      28. \n
        \n
        <\/div>\n<\/div>\n
        \n
        \u5173\u95ed\u4e8b\u4ef6\u5faa\u73af<\/span><\/div>\n<\/div>\n<\/li>\n
      29. \n
        \n
        <\/div>\n<\/div>\n
        \n
        ”’<\/span><\/div>\n<\/div>\n<\/li>\n<\/ol>\n

        \u518d\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50\uff1a<\/p>\n

          \n
        1. \n
          \n
          <\/div>\n<\/div>\n
          \n
          import<\/span> asyncio<\/div>\n<\/div>\n<\/li>\n
        2. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        3. \n
          \n
          <\/div>\n<\/div>\n
          \n
          def<\/span> callback<\/span>(a, loop<\/span>):<\/span><\/div>\n<\/div>\n<\/li>\n
        4. \n
          \n
          <\/div>\n<\/div>\n
          \n
          print(“\u6211\u7684\u53c2\u6570\u4e3a {0}\uff0c\u6267\u884c\u7684\u65f6\u95f4\u4e3a{1}”<\/span>.format(a,loop.time()))<\/div>\n<\/div>\n<\/li>\n
        5. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        6. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        7. \n
          \n
          <\/div>\n<\/div>\n
          \n
          #call_later, call_at<\/span><\/div>\n<\/div>\n<\/li>\n
        8. \n
          \n
          <\/div>\n<\/div>\n
          \n
          if<\/span> __name__ == “__main__”<\/span>:<\/div>\n<\/div>\n<\/li>\n
        9. \n
          \n
          <\/div>\n<\/div>\n
          \n
          try<\/span>:<\/div>\n<\/div>\n<\/li>\n
        10. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop = asyncio.get_event_loop()<\/div>\n<\/div>\n<\/li>\n
        11. \n
          \n
          <\/div>\n<\/div>\n
          \n
          now = loop.time()<\/div>\n<\/div>\n<\/li>\n
        12. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop.call_later(5<\/span>, callback, 5<\/span>, loop) #\u7b2c\u4e00\u4e2a\u53c2\u6570\u8bbe\u7f6e\u7684\u65f6\u95f45.5\u79d2\u540e\u6267\u884c\uff0c<\/span><\/div>\n<\/div>\n<\/li>\n
        13. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop.call_at(now+2<\/span>, callback, 2<\/span>, loop) #\u5728\u6307\u5b9a\u7684\u65f6\u95f4\uff0c\u8fd0\u884c\uff0c\u5f53\u524d\u65f6\u95f4+2\u79d2<\/span><\/div>\n<\/div>\n<\/li>\n
        14. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop.call_at(now+1<\/span>, callback, 1<\/span>, loop)<\/div>\n<\/div>\n<\/li>\n
        15. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop.call_at(now+3<\/span>, callback, 3<\/span>, loop)<\/div>\n<\/div>\n<\/li>\n
        16. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop.call_soon(callback, 4<\/span>, loop)<\/div>\n<\/div>\n<\/li>\n
        17. \n
          \n
          <\/div>\n<\/div>\n
          \n
          loop.run_forever() #\u8981\u7528\u8fd9\u4e2arun_forever\u8fd0\u884c\uff0c\u56e0\u4e3a\u6ca1\u6709\u4f20\u5165\u534f\u7a0b\uff0c\u8fd9\u4e2a\u51fd\u6570\u57283.7\u4e2d\u5df2\u7ecf\u88ab\u53d6\u6d88<\/span><\/div>\n<\/div>\n<\/li>\n
        18. \n
          \n
          <\/div>\n<\/div>\n
          \n
          except<\/span> KeyboardInterrupt:<\/div>\n<\/div>\n<\/li>\n
        19. \n
          \n
          <\/div>\n<\/div>\n
          \n
          print(“Goodbye!”<\/span>)<\/div>\n<\/div>\n<\/li>\n
        20. \n
          \n
          <\/div>\n<\/div>\n
          \n
          <\/div>\n<\/div>\n<\/li>\n
        21. \n
          \n
          <\/div>\n<\/div>\n
          \n
          ”’\u8fd0\u884c\u7ed3\u679c\u4e3a\uff1a<\/span><\/div>\n<\/div>\n<\/li>\n
        22. \n
          \n
          <\/div>\n<\/div>\n
          \n
          \u6211\u7684\u53c2\u6570\u4e3a 4\uff0c\u6267\u884c\u7684\u65f6\u95f4\u4e3a266419.843<\/span><\/div>\n<\/div>\n<\/li>\n
        23. \n
          \n
          <\/div>\n<\/div>\n
          \n
          \u6211\u7684\u53c2\u6570\u4e3a 1\uff0c\u6267\u884c\u7684\u65f6\u95f4\u4e3a266420.843<\/span><\/div>\n<\/div>\n<\/li>\n
        24. \n
          \n
          <\/div>\n<\/div>\n
          \n
          \u6211\u7684\u53c2\u6570\u4e3a 2\uff0c\u6267\u884c\u7684\u65f6\u95f4\u4e3a266421.859<\/span><\/div>\n<\/div>\n<\/li>\n
        25. \n
          \n
          <\/div>\n<\/div>\n
          \n
          \u6211\u7684\u53c2\u6570\u4e3a 3\uff0c\u6267\u884c\u7684\u65f6\u95f4\u4e3a266422.859<\/span><\/div>\n<\/div>\n<\/li>\n
        26. \n
          \n
          <\/div>\n<\/div>\n
          \n
          \u6211\u7684\u53c2\u6570\u4e3a 5\uff0c\u6267\u884c\u7684\u65f6\u95f4\u4e3a266424.843<\/span><\/div>\n<\/div>\n<\/li>\n
        27. \n
          \n
          <\/div>\n<\/div>\n
          \n
          ”’<\/span><\/div>\n<\/div>\n<\/li>\n<\/ol>\n

          \u603b\u7ed3\u6ce8\u610f\u4e8b\u9879\uff1a<\/strong><\/p>\n

          \uff081\uff09CallBack\u51fd\u6570\u53ea\u80fd\u591f\u5b9a\u4e49\u4e3a\u540c\u6b65\u65b9\u6cd5\uff0c\u4e0d\u80fd\u591f\u5b9a\u4e49\u4e3aasync\u65b9\u6cd5\uff0c\u53ca\u4e0d\u80fd\u4f7f\u7528async\u548c@asyncio.coroutine\u4fee\u9970\uff1b<\/p>\n

          \uff082\uff09\u6bcf\u4e00\u4e2aCallBack\u65b9\u6cd5\u53ea\u4f1a\u8c03\u7528\u4e00\u6b21\uff0c\u5982\u679c\u5728\u540c\u4e00\u4e2a\u65f6\u523b\u6709\u53e6\u4e2aCallBack\u65b9\u6cd5\u9700\u8981\u8c03\u7528\uff0c\u5219\u4ed6\u4eec\u7684\u6267\u884c\u987a\u5e8f\u662f\u4e0d\u786e\u5b9a\u7684\uff1b<\/p>\n

          \uff083\uff09\u6ce8\u610f\u4f7f\u7528functools.partial\uff08\uff09\u53bb\u4fee\u9970\u5e26\u6709\u5173\u952e\u5b57\u53c2\u6570\u7684CallBack\u65b9\u6cd5\uff1b<\/p>\n

          \uff084\uff09\u5982\u4f55\u7406\u89e3\uff1f<\/strong>\u5bf9\u4e8e\u4e00\u822c\u7684\u5f02\u6b65\u51fd\u6570\uff0c\u6211\u4eec\u9700\u8981\u5c06\u5b83\u653e\u5728\u65f6\u95f4\u5faa\u73af\u91cc\u9762\uff0c\u7136\u540e\u901a\u8fc7\u4e8b\u4ef6\u5faa\u73af\u53bb\u5faa\u73af\u8c03\u7528\u5b83\uff0c\u800c\u56e0\u4e3aCallBack\u5e76\u4e0d\u662f\u5f02\u6b65\u51fd\u6570\uff0c\u5b83\u662f\u5b9a\u4e49\u4e3a\u666e\u901a\u7684\u540c\u6b65\u65b9\u6cd5\uff0c\u6240\u4ee5\u4e0d\u80fd\u591f\u653e\u5728\u65f6\u95f4\u5faa\u73af\u91cc\u9762\uff0c\u4f46\u662f\u5982\u679c\u6211\u4f9d\u7136\u60f3\u8981\u8ba9\u4e8b\u4ef6\u5faa\u73af\u53bb\u6267\u884c\u5b83\u600e\u4e48\u529e\u5462\uff1f\u90a3\u5c31\u4e0d\u653e\u8fdb\u4e8b\u4ef6\u5faa\u73af\uff0c\u76f4\u63a5\u8ba9\u4e8b\u4ef6\u5faa\u73af\u201c\u7acb\u5373\u3001\u7a0d\u540e\u3001\u5728\u4ec0\u4e48\u65f6\u5019\u201d\u53bb\u6267\u884c\u5b83\u4e0d\u5c31\u884c\u4e86\u561b\uff0ccall\u7684\u542b\u4e49\u5c31\u662f\u201c\u6267\u884c\u201d\u3002<\/p>\n

          \u4e8c\u3001\u5e95\u5c42API\u4e4bFuture<\/h2>\n

          1\u3001Future\u7684\u5b9a\u4e49\u6982\u89c8<\/strong><\/p>\n

          Future\u7684\u672c\u8d28\u662f\u4e00\u4e2a\u7c7b\u3002\u4ed6\u8868\u793a\u7684\u662f\u5f02\u6b65\u64cd\u4f5c\u7684\u6700\u7ec8\u5c06\u8981\u8fd4\u56de\u7684\u7ed3\u679c\uff0c\u6545\u800c\u547d\u540d\u4e3aFuture\uff0c\u5b83\u4e0d\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002Future\u5bf9\u8c61\u662fawaitable\u7684\uff0c\u53c2\u89c1\u7cfb\u7c7b\u6587\u7ae0\u7684\u524d\u9762\uff0c<\/p>\n

          class\u00a0<\/em>asyncio.<\/code>Future<\/code>(*<\/em>,\u00a0loop=None<\/em>)<\/p>\n

          2\u3001asyncio\u4e2d\u5173\u4e8eFuture\u7684\u51e0\u4e2a\u65b9\u6cd5<\/strong><\/p>\n

          \uff081\uff09asyncio.<\/code>isfuture<\/code>(obj<\/em>) \u3002\u5224\u65ad\u4e00\u4e2a\u5bf9\u8c61\u662f\u4e0d\u662fFuture\uff0c\u6ce8\u610fpython\u4e2d\u4e00\u5207\u7686\u5bf9\u8c61\u54e6\uff0c\u5305\u62ec\u51fd\u6570\uff0c\u5f53obj\u662f\u4e0b\u9762\u51e0\u79cd\u60c5\u51b5\u65f6\u8fd4\u56detrue\uff1a<\/p>\n