python-asyncio

问题 I'm trying to get data from a website using async in python. As an example I used this code (under A Better Coroutine Example): https://www.blog.pythonlibrary.org/2016/07/26/python-3-an-intro-to-asyncio/ Now this works fine, but it writes the binary chunks to a file and I don't want it in a file. I want the resulting data directly. But I currently have a list of coroutine objects which I can not get the data out of. The code: # -*- coding: utf-8 -*- import aiohttp import asyncio import async

问题 I've written a script in python in combination with pyppeteer along with asyncio to scrape the links of different posts from its landing page and eventually get the title of each post by tracking the url leading to its inner page. The content I parsed here are not dynamic ones. However, I made use of pyppeteer and asyncio to see how efficiently it performs asynchronously . The following script goes well for some moments but then enounters an error: File "C:\Users\asyncio\tasks.py", line 526,

问题 where This is on Linux, Python 3.5.1. what I'm developing a monitor process with asyncio , whose tasks at various places await on asyncio.sleep calls of various durations. There are points in time when I would like to be able to interrupt all said asyncio.sleep calls and let all tasks proceed normally, but I can't find how to do that. An example is for graceful shutdown of the monitor process. how (failed assumption) I thought that I could send an ALRM signal to that effect, but the process

问题 I was reading asyncio documentation for task cancel and I came across this - To cancel a running Task use the cancel() method. Calling it will cause the Task to throw a CancelledError exception into the wrapped coroutine. If a coroutine is awaiting on a Future object during cancellation, the Future object will be cancelled. cancelled() can be used to check if the Task was cancelled. The method returns True if the wrapped coroutine did not suppress the CancelledError exception and was actually

问题 I have an RDD containing 10000 urls to be fetched. list = ['http://SDFKHSKHGKLHSKLJHGSDFKSJH.com', 'http://google.com', 'http://twitter.com'] urls = sc.parallelize(list) I need to check which urls are broken and preferably fetch the results to a corresponding RDD in Python. I tried this: import asyncio import concurrent.futures import requests async def get(url): with concurrent.futures.ThreadPoolExecutor() as executor: loop = asyncio.get_event_loop() futures = [ loop.run_in_executor(

问题 I am trying to create a Discord bot with Python, however whenever I run the sample code here: import discord client = discord.Client() @client.event async def on_message(message): # we do not want the bot to reply to itself if message.author == client.user: return if message.content.startswith('!hello'): msg = 'Hello {0.author.mention}'.format(message) await client.send_message(message.channel, msg) @client.event async def on_ready(): print('Logged in as') print(client.user.name) print(client

问题 After perusing many docs on AsyncIO and articles I still could not find an answer to this : Run a function asynchronously (without using a thread) and also ensure the function calling this async function continues its execution. Pseudo - code : async def functionAsync(p): #... #perform intensive calculations #... print ("Async loop done") def functionNormal(): p = "" functionA(p) return ("Main loop ended") print ("Start Code") print functionNormal() Expected Output : Start code Main loop

问题 Here is an example how to do non-blocking socket connects (as client) within asyncore . Since this module is deprecated with recomendation 'Deprecated since version 3.6: Please use asyncio instead.' How does it possible within asyncio ? Creating socket and it's connect inside coroutine is working syncronious and create problem like it described in linked question. 回答1: A connect inside a coroutine appears synchronous to that coroutine, but is in fact asynchronous with respect to the event

问题 Here is an example how to do non-blocking socket connects (as client) within asyncore . Since this module is deprecated with recomendation 'Deprecated since version 3.6: Please use asyncio instead.' How does it possible within asyncio ? Creating socket and it's connect inside coroutine is working syncronious and create problem like it described in linked question. 回答1: A connect inside a coroutine appears synchronous to that coroutine, but is in fact asynchronous with respect to the event

问题 I mean what do I get from using async for . Here is the code I write with async for , AIter(10) could be replaced with get_range() . But the code runs like sync not async. import asyncio async def get_range(): for i in range(10): print(f"start {i}") await asyncio.sleep(1) print(f"end {i}") yield i class AIter: def __init__(self, N): self.i = 0 self.N = N def __aiter__(self): return self async def __anext__(self): i = self.i print(f"start {i}") await asyncio.sleep(1) print(f"end {i}") if i >=