CodePattern/B 高性能模式/协程_code.ipynb

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   "source": [
    "async def job(t):  # async代表这个方法可以异步\n",
    "await代表运行这个方法的时候可以切换到下一个程序"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
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    {
     "ename": "NameError",
     "evalue": "name 'sleep' is not defined",
     "output_type": "error",
     "traceback": [
      "\u001b[0;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[0;31mNameError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[0;32m<ipython-input-9-7abcb23d41ae>\u001b[0m in \u001b[0;36m<module>\u001b[0;34m\u001b[0m\n\u001b[1;32m      8\u001b[0m \u001b[0;31m# type(ff),type( ff() )   # 是个协程类型\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      9\u001b[0m \u001b[0;31m# asyncio.run(main())\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m---> 10\u001b[0;31m \u001b[0;32mawait\u001b[0m \u001b[0mff\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m   \u001b[0;31m# 这样才能执行\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m     11\u001b[0m \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m2\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;32m<ipython-input-9-7abcb23d41ae>\u001b[0m in \u001b[0;36mff\u001b[0;34m()\u001b[0m\n\u001b[1;32m      2\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      3\u001b[0m \u001b[0;32masync\u001b[0m \u001b[0;32mdef\u001b[0m \u001b[0mff\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m:\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0;32m----> 4\u001b[0;31m     \u001b[0msleep\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m2\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[0m\u001b[1;32m      5\u001b[0m     \u001b[0mprint\u001b[0m\u001b[0;34m(\u001b[0m\u001b[0;36m1\u001b[0m\u001b[0;34m)\u001b[0m\u001b[0;34m\u001b[0m\u001b[0;34m\u001b[0m\u001b[0m\n\u001b[1;32m      6\u001b[0m \u001b[0;34m\u001b[0m\u001b[0m\n",
      "\u001b[0;31mNameError\u001b[0m: name 'sleep' is not defined"
     ]
    }
   ],
   "source": [
    "import asyncio\n",
    "\n",
    "async def ff():  \n",
    "    sleep(2)\n",
    "    print(1)\n",
    "\n",
    "# ff()  # 不执行\n",
    "# type(ff),type( ff() )   # 是个协程类型\n",
    "# asyncio.run(main())  \n",
    "await ff()   # 这样才能执行\n",
    "print(2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hi\n",
      "hi\n",
      "hi\n",
      "result\n",
      "result\n",
      "result\n"
     ]
    }
   ],
   "source": [
    "async def foo():\n",
    "    print('hi')\n",
    "    return 'result'\n",
    "\n",
    "# 多个函数执行，但是没有用的轮流切换的特点\n",
    "for x in await asyncio.gather( foo(),foo(),foo() ): print(x)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "A\n",
      "B\n",
      "C\n",
      "name = B,<_MainThread(MainThread, started 139785495770944)> \n",
      "name = C,<_MainThread(MainThread, started 139785495770944)> \n",
      "name = A,<_MainThread(MainThread, started 139785495770944)> \n"
     ]
    }
   ],
   "source": [
    "import threading\n",
    "\n",
    "async def foo( s:str, count: int ):\n",
    "    print(f\"{s}\")\n",
    "    await asyncio.sleep(count) # 假装有一个 io操作，交出控制权\n",
    "    print(f\"name = {s},{threading.currentThread()} \")   \n",
    "\n",
    "async def main():\n",
    "#     task1 = asyncio.create_task(foo(\"A\", 2))\n",
    "#     task2 = asyncio.create_task(foo(\"B\", 3))\n",
    "#     task3 = asyncio.create_task(foo(\"C\", 2))\n",
    "\n",
    "#     await asyncio.gather( task1,task2,task2 ) #并发运行任务    \n",
    "#     await task1\n",
    "#     await task2\n",
    "#     await task3\n",
    "\n",
    "    await asyncio.gather( foo(\"A\", 4),foo(\"B\", 1),foo(\"C\", 2) ) #并发运行任务   \n",
    "\n",
    "# asyncio.run(main())\n",
    "await main()"
   ]
  },
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   "cell_type": "code",
   "execution_count": 85,
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   "source": [
    "# 使用一个爬虫来做验证\n",
    "import aiohttp\n",
    " \n",
    "async def fetch(session, url):\n",
    "    async with session.get(url) as response:\n",
    "        return await response.text()\n",
    " \n",
    "async def main(url):\n",
    "    async with aiohttp.ClientSession() as session:\n",
    "        html = await fetch(session, url)\n",
    "        print(html[:5]) \n",
    "        \n",
    "### 或者写成\n",
    "async def main(url):\n",
    "    async with aiohttp.ClientSession() as session:\n",
    "        async with session.get(url, params=payload) as response:\n",
    "            return await response.text()        \n",
    "\n",
    "# 要句句修饰？ 不太熟悉，这种写法        \n",
    "async def main(url):\n",
    "    async with aiohttp.ClientSession() as session:\n",
    "        async with session.get(url, params=payload) as response:\n",
    "#             return await response.text()\n",
    "            data = await response.text()  # 吐数据的地方\n",
    "            return data\n",
    "        \n",
    "url = \"http://httpbin.org/get\"\n",
    "payload = {'key1': 'value1', 'key2': 'value2'}\n",
    "\n",
    "async def ff():\n",
    "    a = time.time()    \n",
    "    task = asyncio.create_task( main(url) )\n",
    "    data = await asyncio.gather( *[ task for x in range(10)] )\n",
    "    [ x[:20] for x in data ]\n",
    "    return  time.time() - a \n",
    "    \n",
    "await ff()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 82,
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   ],
   "source": [
    "# 比较时间消耗\n",
    "import requests\n",
    "\n",
    "a = time.time()    \n",
    "[ requests.get( url, params=payload ).text[:20]  for x in range(10) ]\n",
    "time.time() - a"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "aiofile, aioredis ..."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 应用案例"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "小明放了一个鱼丸，现在锅里还有1个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有0个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有1个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有2个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有1个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有2个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有3个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有2个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有3个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有4个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有3个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有4个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有5个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有4个鱼丸\n",
      "小明放了一个鱼丸，现在锅里还有5个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有4个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有3个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有2个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有1个鱼丸\n",
      "mony吃了一个鱼丸，现在锅里还有0个鱼丸\n"
     ]
    }
   ],
   "source": [
    "# 生产者，消费者模式\n",
    "\n",
    "arr = []\n",
    "async def produce():\n",
    "    for i in range(10):        \n",
    "        await asyncio.sleep(1)\n",
    "        arr.append(i)\n",
    "        print(\"小明放了一个鱼丸，现在锅里还有%s个鱼丸\"%len(arr))\n",
    "\n",
    "async def consumer():\n",
    "    while True:        \n",
    "        await asyncio.sleep(2)\n",
    "        if arr:  #各一个判断条件\n",
    "            arr.pop()\n",
    "            print(\"mony吃了一个鱼丸，现在锅里还有%s个鱼丸\"%len(arr))        \n",
    "        else:\n",
    "            break\n",
    "\n",
    "async def main():\n",
    "    # t1 = asyncio.create_task(produce())   #创建任务\n",
    "    # t2 = asyncio.create_task(consumer())\n",
    "    # await asyncio.gather(t1,t2) #并发运行任务\n",
    "    await asyncio.gather( produce(),consumer() ) #并发运行任务\n",
    "    \n",
    "await main()"
   ]
  }
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