Python web开发中的异步IO性能优化技巧

import asyncio

async def my_coroutine():
    print('开始执行协程...')
    await asyncio.sleep(1)
    print('协程执行完毕 !')
    
async def main():
    # 第一个协程
    coro1 = my_coroutine()
    # 第二个协程
    coro2 = my_coroutine()
    print("开始执行两个协程...")
    await coro1
    await coro2

# 实例化一个事件循环
loop = asyncio.get_event_loop()
# 执行主协程
loop.run_until_complete(main())

from aiohttp import web

async def handle(request):
    # 获取get参数，即 ?name=test
    name = request.query.get('name', "Anonymous")
    text = "Hello, " + name
    # 返回Response对象
    return web.Response(text=text)

# 初始化web应用，创建一个app对象
app = web.Application()
# 把URL路径'/'和函数句柄handle绑定到一起
app.add_routes([web.get('/', handle)])

# 启动web应用服务
if __name__ == '__main__':
    web.run_app(app, port=8080)

import aiohttp
import asyncio

async def fetch(session, url):
    async with session.get(url) as response:
        return await response.text()

async def main():
    async with aiohttp.ClientSession() as session:
        tasks = []
        for i in range(50):
            task = asyncio.create_task(fetch(session, f'https://jsonplaceholder.typicode.com/todos/{i}'))
            tasks.append(task)

        responses = await asyncio.gather(*tasks)
        # do something with responses...

# 实例化一个事件循环
loop = asyncio.get_event_loop()
# 执行异步任务
loop.run_until_complete(main())

import asyncio
import aiomysql

async def test_example():
    async with aiomysql.create_pool(host='localhost', user='root',
                                    password='', db='test', charset='utf8mb4',
                                    autocommit=True) as pool:
           async with pool.acquire() as conn:
               async with conn.cursor() as cur:
                    await cur.execute("select id, name from tb_user where id=1")
                    result = await cur.fetchone()
                    print(result)

if __name__ == '__main__':
    # 实例化一个事件循环
    loop = asyncio.get_event_loop()
    # 执行异步任务
    loop.run_until_complete(test_example())