Angelos Panagiotopoulos angelospanag

Using websockets to easily build GUIs for Python programs

I recently built a small agent-based model using Python and wanted to visualize the model in action. But as much as Python is an ideal tool for scientific computation (numpy, scipy, matplotlib), it's not as good for dynamic visualization (pygame?).

You know what's a very mature and flexible tool for drawing graphics? The DOM! For simple graphics you can use HTML and CSS; for more complicated stuff you can use Canvas, SVG, or WebGL. There are countless frameworks, libraries, and tutorials to help you draw exactly what you need. In my case, this was the animation I wanted:

(Each row represents a "worker" in my model, and each rectangle represents a "task.")

Websockets-through-ELB-to-Nginx-to-another-ELB recap

We need to setup an ELB with SSL termination in front of a Nginx reverse proxy to some already working ELB + project system. IOW: SSL-ELB -> Nginx reverse proxy -> ELB -> project. We'll assume the last ELB + project bit works properly.

Front ELB configuration

Configure the listeners to use TCP (80) instead of HTTP to allow the websockets (non-HTTP) to pass through. For HTTPS with SSL termination, simply use SSL (443) -> TCP (80)

VSCode

Bracket Pair Colorizer

Sublime Text

BracketHighlighter rainbowth for ST 3 rainbowth for ST 2

FINALLY no need for tricks!

bonus tip: for more darkness > https://darkreader.org/

Remove MySQL completely

Open the Terminal
Use mysqldump to backup your databases
Check for MySQL processes with: ps -ax | grep mysql
Stop and kill any MySQL processes
Analyze MySQL on HomeBrew:
```
brew remove mysql
```

agnoster.zsh-theme

A ZSH theme optimized for people who use:

Solarized
Git
Unicode-compatible fonts and terminals (I use iTerm2 + Menlo)

For Mac users, I highly recommend iTerm 2 + Solarized Dark

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!

	# install openjdk
	sudo apt-get install openjdk-7-jdk

	# download android sdk
	wget http://dl.google.com/android/android-sdk_r24.2-linux.tgz

	tar -xvf android-sdk_r24.2-linux.tgz
	cd android-sdk-linux/tools

	# install all sdk packages

	package main

	import (
	"fmt"
	"log"
	"net"
	"net/mail"
	"net/smtp"
	"crypto/tls"
	)

	package main

	import (

	"log"
	"net/mail"
	"encoding/base64"
	"net/smtp"
	"fmt"
	"strings"