Tao Yang ninehills

One-line Tree in Python

Using Python's built-in defaultdict we can easily define a tree data structure:

def tree(): return defaultdict(tree)

That's it!

Python Number Conversion Chart

From	To	Expression

ZeroRPC简介 - 轻量级分布式通信框架

概述

分布式系统的核心是分布式通信，而传统上开发一套支持上千台规模集群，可靠性非常高的分布式通信框架，需要不少的精力投入。而在多数情景下，我们（特别是时间宝贵的OP）并不是非常关注技术实现的细节，而是希望有一套成熟、轻量、可靠性高、使用方便而且易于调试的分布式通信框架，可以直接使用，从而把时间放在具体业务逻辑上。

在PyCon 2012大会上，dotcloud公司开源了一套基于ZeroMQ和MessagePack的分布式通信框架（或者说是协议+Python实现）。该框架因为基于ZeroMQ，使用方法是RPC，所以被命名为ZeroRPC。ZeroRPC的特点在其官网的介绍中一目了然[1]：

ZeroRPC is a light-weight, reliable and language-agnostic library for distributed communication between server-side processes.

	# Copyright (c) 2010, Philip Plante of EndlessPaths.com
	#
	# Permission is hereby granted, free of charge, to any person obtaining a copy
	# of this software and associated documentation files (the "Software"), to deal
	# in the Software without restriction, including without limitation the rights
	# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	# copies of the Software, and to permit persons to whom the Software is
	# furnished to do so, subject to the following conditions:
	#
	# The above copyright notice and this permission notice shall be included in

	from time import sleep
	import tornado
	from multiprocessing.pool import ThreadPool

	_workers = ThreadPool(10)

	class BackgroundMix(tornado.web.RequestHandler):
	"""将block任务放入线程池中执行
	EXAMPLE:
	# blocking task like querying to MySQL

	#!/usr/bin/env python
	#coding:utf-8

	import sys, os, re
	import logging

	from tornado.ioloop import IOLoop
	from tornado.iostream import IOStream
	from tornado.netutil import TCPServer

	(function () {
	if ("undefined" !== typeof Send2eg300) {
	return
	};
	window.Send2eg300 = Send2eg300 = {
	server: "http://send2.eg300.com/",
	jQuery: "js/jquery-1.8.3.min.js",
	params: {
	"isLinkConverted": false
	},

	#!/bin/bash
	#Usage: sh $0 <app_id>

	if [[ $? != 1 ]];then
	echo "Usage: sh $0 <extension_id>" >&2
	echo "Output: <extension_id>.crx (zip file)"
	exit 1
	fi

	app_id=$1