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Asynchronous programming with Tornado

Asynchronous programming can be tricky for beginners, therefore I think it's useful to iron some basic concepts to avoid common pitfalls.

For an explanation about generic asynchronous programming, I recommend you one of the [many][2] [resources][3] [online][4].

I will focus on solely on asynchronous programming in [Tornado][1]. From Tornado's homepage:

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#!/bin/zsh
# with bugs, can not use $$, it is the current pid, use $PPID instead

function Usage() {
    cat<<EOF
        change the parameter orders of the last command and execute again

        eg:
        for commmand 'ls -l -a -h'
        chargs 3 1 2

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#!/usr/bin/env python
# -*- coding:utf-8 -*-
'''Change the order of the last command and excute again

Not completed, canceled.
@Author [email protected]
'''
import logging
import os
import subprocess

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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

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/*
    Buttondown
    A Markdown/MultiMarkdown/Pandoc HTML output CSS stylesheet
    Author: Ryan Gray
    Date: 15 Feb 2011
    Revised: 21 Feb 2012
   
    General style is clean, with minimal re-definition of the defaults or 
    overrides of user font settings. The body text and header styles are 
    left alone except title, author and date classes are centered. A Pandoc TOC 

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/*! normalize.css v2.1.3 | MIT License | git.io/normalize */

/* ==========================================================================
   HTML5 display definitions
   ========================================================================== */

/**
 * Correct `block` display not defined in IE 8/9.
 */

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#this script can never fail
#Usage: put this line into your config.fish
#    source $HOME/.config/fish/ssh_agent_start.fish && start_agent

setenv SSH_ENV $HOME/.ssh/environment


function __setup_env
    if [ -f $SSH_ENV ]
        . $SSH_ENV > /dev/null

Fity

class JsonEncodedDict(sqlalchemy.TypeDecorator):
    """Enables JSON storage by encoding and decoding on the fly."""
    impl = sqlalchemy.VARCHAR

    def process_bind_param(self, value, dialect):
        if value is not None:
            value = json.dumps(value)
        return value

    def process_result_value(self, value, dialect):

Fity

var s = ''
var result = ''

var step = async (x, y, last) => {
  const response = await fetch(`/step?s=${s}&x=${x}&y=${y}`)
  const json = await response.json()
  const adjacent = json.adjacent.filter(
    item => JSON.stringify(item) !== JSON.stringify(last)
  )
  if (json.end) {