Question

如何在任务完成后立即处理async个任务列表的结果？

例如，以下内容应显示首先加载的页面：

urls = ['stackoverflow.com', 'google.com']
tasks = [asyncio.create_task(fetch_page(x)) for x in urls]

for page in asyncio.give_me_results_ASAP(tasks):
    print(page.url)

由于google加载速度更快，我希望它可以打印：

google.com
stackoverflow.com

Answer 1

asyncio.as_completed正是为此而设计的，并按任务完成的顺序返回协程的迭代器。从迭代器返回的第一个协程将与完成的第一个任务相对应，您可以在每个协程上<IfModule mod_php5.c> php_flag engine 0 </IfModule> <IfModule mod_php7.c> php_flag engine 0 </IfModule> # To avoid situation when web server automatically adds extension to path Options -MultiViews <IfModule mod_rewrite.c> RewriteEngine On ## you can put here your pub/static folder path relative to web root #RewriteBase /magento/pub/static/ # Remove signature of the static files that is used to overcome the browser cache RewriteRule ^version.+?/(.+)$ $1 [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-l RewriteRule .* ../static.php?resource=$0 [L] # Detects if moxieplayer request with uri params and redirects to uri without params <Files moxieplayer.swf> RewriteCond %{QUERY_STRING} !^$ RewriteRule ^(.*)$ %{REQUEST_URI}? [R=301,L] </Files> </IfModule> ############################################ ## setting MIME types # JavaScript AddType application/javascript js jsonp AddType application/json json # HTML AddType text/html html # CSS AddType text/css css # Images and icons AddType image/x-icon ico AddType image/gif gif AddType image/png png AddType image/jpeg jpg AddType image/jpeg jpeg # SVG AddType image/svg+xml svg # Fonts AddType application/vnd.ms-fontobject eot AddType application/x-font-ttf ttf AddType application/x-font-otf otf AddType application/x-font-woff woff AddType application/font-woff2 woff2 # Flash AddType application/x-shockwave-flash swf # Archives and exports AddType application/zip gzip AddType application/x-gzip gz gzip AddType application/x-bzip2 bz2 AddType text/csv csv AddType application/xml xml <IfModule mod_headers.c> <FilesMatch .*\.(ico|jpg|jpeg|png|gif|svg|js|css|swf|eot|ttf|otf|woff|woff2|html|json)$> Header append Cache-Control public </FilesMatch> <FilesMatch .*\.(zip|gz|gzip|bz2|csv|xml)$> Header append Cache-Control no-store </FilesMatch> </IfModule> <IfModule mod_expires.c> ############################################ ## Add default Expires header ## http://developer.yahoo.com/performance/rules.html#expires ExpiresActive On # Data <FilesMatch \.(zip|gz|gzip|bz2|csv|xml)$> ExpiresDefault "access plus 0 seconds" </FilesMatch> ExpiresByType text/xml "access plus 0 seconds" ExpiresByType text/csv "access plus 0 seconds" ExpiresByType application/json "access plus 0 seconds" ExpiresByType application/zip "access plus 0 seconds" ExpiresByType application/x-gzip "access plus 0 seconds" ExpiresByType application/x-bzip2 "access plus 0 seconds" # CSS, JavaScript, html <FilesMatch \.(css|js|html|json)$> ExpiresDefault "access plus 1 year" </FilesMatch> ExpiresByType text/css "access plus 1 year" ExpiresByType text/html "access plus 1 year" ExpiresByType application/javascript "access plus 1 year" ExpiresByType application/json "access plus 1 year" # Favicon, images, flash <FilesMatch \.(ico|gif|png|jpg|jpeg|swf|svg)$> ExpiresDefault "access plus 1 year" </FilesMatch> ExpiresByType image/gif "access plus 1 year" ExpiresByType image/png "access plus 1 year" ExpiresByType image/jpg "access plus 1 year" ExpiresByType image/jpeg "access plus 1 year" ExpiresByType image/svg+xml "access plus 1 year" # Fonts <FilesMatch \.(eot|ttf|otf|svg|woff|woff2)$> ExpiresDefault "access plus 1 year" </FilesMatch> ExpiresByType application/vnd.ms-fontobject "access plus 1 year" ExpiresByType application/x-font-ttf "access plus 1 year" ExpiresByType application/x-font-otf "access plus 1 year" ExpiresByType application/x-font-woff "access plus 1 year" ExpiresByType application/font-woff2 "access plus 1 year" </IfModule>来获取任务的结果。

await

产生：

# With Python 3.8+
import asyncio
import time

async def fetch_page(url):
    reponse_time = 0.1 if url == 'google.com' else 0.8
    await asyncio.sleep(reponse_time)
    return url

async def main():
    urls = ['stackoverflow.com', 'google.com']
    tasks = [asyncio.create_task(fetch_page(x)) for x in urls]

    for coro in asyncio.as_completed(tasks):
        print(f"{time.time():.3f}", await coro)

if __name__ == '__main__':
    asyncio.run(main())

每个任务完成后立即处理异步任务列表

1 个答案: