gevent：轻松异步 I/O_程序人生

gevent：轻松异步 I/O

admin

2023-07-31 00:38:12

0次

介绍

gevent是一个使用完全同步编程模型的可扩展的异步I/O框架。

让我们先来看一些示例，这里有一个 echo 服务器：

123456789

from gevent.server import StreamServer def connection_handler(socket, address): for l in socket.makefile(\’r\’): socket.sendall(l) if __name__ == \’__main__\’: server = StreamServer((\’0.0.0.0\’, 8000), connection_handler) server.serve_forever()

在这个例子中，我们并行发出100个web请求:

12345678910111213

from gevent import monkeymonkey.patch_all() import urllib2from gevent.pool import Pool def download(url): return urllib2.urlopen(url).read() if __name__ == \’__main__\’: urls = [\’http://httpbin.org/get\’] * 100 pool = Pool(20) print pool.map(download, urls)

有些奇怪monkey.patch_all()的调用？不用担心，这可不像你每天打的猴子补丁(译注：monkey patching，即动态修改执行代码)。这仅仅是Python发行版恰好要打的一组猴子补丁。

最后一个例子是一个聊天服务器：

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859

import geventfrom gevent.queue import Queuefrom gevent.server import StreamServer users = {} # mapping of username -> Queue def broadcast(msg): msg += \’\\n\’ for v in users.values(): v.put(msg) def reader(username, f): for l in f: msg = \’%s> %s\’ % (username, l.strip()) broadcast(msg) def writer(q, sock): while True: msg = q.get() sock.sendall(msg) def read_name(f, sock): while True: sock.sendall(\’Please enter your name: \’) name = f.readline().strip() if name: if name in users: sock.sendall(\’That username is already taken.\\n\’) else: return name def handle(sock, client_addr): f = sock.makefile() name = read_name(f, sock) broadcast(\’## %s joined from %s.\’ % (name, client_addr[0])) from %s.\’ % (name, client_addr[0]))有一个 echo 服务器：

123456789

在这个例子中，我们并行发出100个web请求:

12345678910111213

最后一个例子是一个聊天服务器：

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859

import geventfrom gevent.queue import Queuefrom gevent.server import StreamServer users = {} # mapping of username -> Queue def broadcast(msg): msg += \’\\n\’ for v in users.values(): v.put(msg) def reader(username, f): for l in f: msg = \’%s> %s\’ % (username, l.strip()) broadcast(msg) def writer(q, sock): while True: msg = q.get() sock.sendall(msg) def read_name(f, sock): while True: sock.sendall(\’Please enter your name: \’) name = f.readline().strip() if name: if name in users: sock.sendall(\’That username is already taken.\\n\’) else: return name def handle(sock, client_addr): f = sock.makefile() name = read_name(f, sock) broadcast(\’## %s joined from %s.\’ % (name, client_addr[0]))lass=\”crayon-sy\”>() import urllib2from gevent.pool import Pool def download(url): return urllib2.urlopen(url).read()

上一篇：简化 Django

下一篇：在 Ubuntu 上使用 Nginx 部署 Flask 应用

gevent：轻松异步 I/O

介绍

相关内容

热门资讯