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asyncio.sleep

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  • 从asyncio.sleep(延迟)`得到什么?

    Nutshell中Python的示例设置 x为 23 延迟一秒半之后: @asyncio.coroutinedef delayed_result(delay, result): yield from asyncio.sleep= asyncio.get_event_loop()x = loop.run_until_complete(delayed_result(1.5, 23)) 我觉得很难理解什么是yield from asyncio.sleep来自https:docs.python.org3libraryasyncio-task.html#asyncio.sleep Coroutine asyncio.sleep(delay, result=所以asyncio.sleep(delay)返回一个协程对象。 协程对象“完成”是什么意思? yield from asyncio.sleep(delay)为主体计划提供了什么? 谢谢。
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  • Python异步编程之 协程 & asyncio & 异步

    推荐使用asyncio的使用在python3.4及之后加入内置模块import asyncio @asyncio.coroutinedef func1(): print(函数func1) yield asyncio.sleep(5) print(函数func1完成) @asyncio.coroutinedef func2(): print(函数func2) yield asyncio.sleep(3) print(函数func2asyncio.wait(tasks)) async & await 关键字python3.5之后版本import asyncio async def func1(): print(函数func1) await asyncio.sleep(5) print(函数func1完成) async def func2(): print(函数func2) await asyncio.sleep(3) print(函数func2完成) tasks
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  • Python 18.2 asyncio

    由于asyncio.sleep()也是一个coroutine,所以线程不会等待asyncio.sleep(),而是直接中断并执行下一个消息循环。当asyncio.sleep()返回时,线程就可以从yield from拿到返回值(此处是None),然后接着执行下一个语句。把asyncio.sleep()看作是一个耗时1s的IO操作,在此期间,主线程并未等待,而是去执行EventLoop中其他可执行的coroutine了。因此可以实现并发执行。(%s) % threading.currentThread())    yield from asyncio.sleep(1)    print(Hello,again!如果把asyncio.sleep()换成真正的IO操作,则多个coroutine就可以由一个线程并发执行。
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  • Python协程-asyncio、asyncawait

    await asyncio.sleep(1) print(欢迎回到 a !) async def b(): print(欢迎来到 b !)await asyncio.sleep(2) print(欢迎回到 b !),运行到await asyncio.sleep(1),从当前任务切出,事件调度器开始调度 b6、b 开始运行,输出欢迎来到b!await asyncio.sleep(1) print(欢迎回到 a !) async def b(): print(欢迎来到 b !)await asyncio.sleep(2) print(欢迎回到 b !)
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  • python asyncio coroutine协程的并发 task(并行编程 28)

    (num): f=1 for i in range(2,num+1): print(Asyncio.Task:Computer factories({}).format(i)) yield from asyncio.sleepa,b=0,1 for i in range(2, num + 1): print(Asyncio.Task:Computer fibonacci({}).format(i)) yield from asyncio.sleeprange(1,k+1): result=result(n-i+1)i print(Asyncio.Task:Computer binomialcoeff({}).format(i)) yield from asyncio.sleep
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  • Python 的异步 IO:Asyncio 简介

    协程可以:* 等待一个 future 结束 * 等待另一个协程(产生一个结果,或引发一个异常) * 产生一个结果给正在等它的协程 * 引发一个异常给正在等它的协程asyncio.sleep 也是一个协程,所以 await asyncio.sleep(x) 就是等待另一个协程。可参见 asyncio.sleep 的文档:sleep(delay, result=None, *, loop=None)Coroutine that completes after a given time所以,只能在协程中调 stop:async def do_some_work(loop, x): print(Waiting + str(x)) await asyncio.sleep(x) printTimerC++ Boost.Asio 提供了 IO 对象 timer,但是 Python 并没有原生支持 timer,不过可以用 asyncio.sleep 模拟。
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  • 关于asyncio知识(一)

    我们先通过下面的一个例子理解:import asyncioasync def foo(): print(running in foo) await asyncio.sleep(0) print(backfoo)async def bar(): print(running in bar) await asyncio.sleep(0) print(back bar)async def main(): tasks是为了模拟每个请求有一定延迟返回 await asyncio.sleep(sleepy_time) response.close() return coroutine {}: {}, took: {:.2f是为了模拟每个请求有一定延迟返回 await asyncio.sleep(sleepy_time) response.close() return coroutine {}: {}, took: {:.2f是为了模拟每个请求有一定延迟返回 await asyncio.sleep(sleepy_time) response.close() return coroutine {}: {}, took: {:.2f
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  • 学习一下Python3的协程

    获取异步的结果 import asyncio async def slow_operation(future): await asyncio.sleep(1) future.set_result(Future回调 import asyncio async def slow_operation(): await asyncio.sleep(1) return Future is done!number): f = 1 for i in range(2, number+1): print(Task %s: Compute factorial(%s)... % (name, i)) await asyncio.sleep一些小细节 在看这个内容的时候,我一直在想,使用time.sleep(1)和await asyncio.sleep(1)有什么区别。把上面的多任务执行实例中的await asyncio.sleep(1)改成time.sleep(1)。你会发现,这三个任务是串行的。
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  • python协程

    版本 3.7 以上import asyncioasync def print_num(num): print(Maoli is printing + str(num) + nows ) await asyncio.sleepimport asyncioasync def print_num(num): print(Maoli is printing + str(num) + nows ) await asyncio.sleeptasks)这种方法import asyncioasync def print_num(num): print(Maoli is printing + str(num) + nows ) await asyncio.sleep(5): val = random.randint(1, 10) await queue.put(val) print({} put a val: {}.format(id, val)) await asyncio.sleepproducer_1)) # 生产者2号 producer_2 = asyncio.create_task(producer(queue, producer_2)) # stop 10秒 await asyncio.sleep
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  • Python抓取Google Trends(谷歌指数)

    geo=US) await page.type(selector=input#input-254, text=bitcoin) await asyncio.sleep(1) # 等待网页加载出来,懒得用条件判断了await page.keyboard.press(Enter) await asyncio.sleep(2) # print(await page.title()) await page.goto(date=now%207-d&q=bitcoin) await asyncio.sleep(2) content_text = await page.content() # print(content_text
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  • python asyncio 协程futures结果回调(并行编程 29)

    asyncio,sys @asyncio.coroutine def f(fu,n): count=0 for i in range(1,n+1): count=count+i yield from asyncio.sleepcoroute+str(count)) @asyncio.coroutine def s(fu,n): count=1 for i in range(2,n+1): count*=i yield from asyncio.sleep
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  • python 性能的优化

    # 异步调用asyncio.sleep(1): r = yield from asyncio.sleep(1) print(Hello again!)由于asyncio.sleep()也是一个coroutine,所以线程不会等待asyncio.sleep(),而是直接中断并执行下一个消息循环。当asyncio.sleep()返回时,线程就可以从yield from拿到返回值(此处是None),然后接着执行下一行语句。(%s) % threading.currentThread()) yield from asyncio.sleep(1) print(Hello again!r = await asyncio.sleep(1) print(Hello again!)
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  • python:python中异步的使用姿势

    最简单的用法如下:import asyncio loop = asyncio.get_event_loop() async def test(): print(test is run) await asyncio.sleep单实例下一种常见的“错误”写法如下:import asyncio loop = asyncio.get_event_loop() async def test(): print(test is run) await asyncio.sleepawait task.import asyncio loop = asyncio.get_event_loop() async def test(): print(test is run) await asyncio.sleep
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  • Day26异步IO

    (%s) %threading.currentThread()) yield from asyncio.sleep(1) print(Hello world!如果把asyncio.sleep()换成真正的IO操作,则多个coroutine就可以由一个线程并发执行。r = yield from asyncio.sleep(1) print(Hello again!)用新语法重新编写:async def hello(): print(Hello world!)r = await asyncio.sleep(1) print(Hello again!)
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  • 异步函数中的变量不会在while-True循环中重新计算?

    通过await asyncio.sleep(1)在for循环之后添加一行来解决该问题。但为什么?self.subscriptions每次启动for循环时都不应重新评估?try: await self.send(json.dumps(dummy_data)) except Exception as e: await self.close() break await asyncio.sleep
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    回答:1
  • 最新的 Python 异步到底是怎么实现的?本篇为你深度解析!

    代码例子:import asyncio async def gen(): await asyncio.sleep(0.1) v = yield 42 print(v) await asyncio.sleep代码如下:import asyncio async def gen(): try: await asyncio.sleep(0.1) yield hello except IndexError: awaitasyncio.sleep(0.2) yield world async def start(): g = gen() v = await g.asend(None) print(v) # Willimport asyncio async def gen(): try: await asyncio.sleep(0.1) v = yield 42 print(v) await asyncio.sleepasync def gen(): try: await asyncio.sleep(0.1) v = yield 42 print(v) await asyncio.sleep(0.2) except:
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  • Python - 如何使任务使用asyncio异步运行?

    usrbinenv python3 import asyncio async def do_b(client): print({}: doing b....format(client)) await asyncio.sleepformat(client)) async def do_a(client): print({}: doing a....format(client)) await asyncio.sleep(1) print
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    回答:2
  • Python3.7的新API:asyncio.run()

    wait_and_echo(content): wait = random.randint(0, 10) print(fprint {content} after {wait} seconds) await asyncio.sleepExample: async def main(): await asyncio.sleep(1) print(hello) asyncio.run(main())File: c:userspcappdatalocalprogramspythonpython37libasynciorunners.pyTypewait_and_echo(content): wait = random.randint(0, 10) print(fprint {content} after {wait} seconds) await asyncio.sleep
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  • PEP 525--异步生成器

    代码例子:import asyncio async def gen(): await asyncio.sleep(0.1) v = yield 42 print(v) await asyncio.sleepasyncio.sleep(0.2) yield world async def start(): g = gen() v = await g.asend(None) print(v) # Willimport asyncio async def gen(): try: await asyncio.sleep(0.1) v = yield 42 print(v) await asyncio.sleepasync def gen(): try: await asyncio.sleep(0.1) v = yield 42 print(v) await asyncio.sleep(0.2) except:代码示例async def ticker(delay, to): for i in range(to): yield i await asyncio.sleep(delay) async def run
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  • Python asyncio对等待和任务感到困惑

    在这里完成newb,阅读有关此示例的Asycnio Tasks: import asyncioimport time async def say_after(delay, what): await asyncio.sleep. import asyncioimport time async def say_after(delay, what): print(Received {}.format(what)) await asyncio.sleep
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    回答:2

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