Alan Dong ldong

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

brew install tree rmtrash ag sift python python3 gawk tmux cscope ctags fasd git git-flow aria2 wget mmv rename

brew install tig jq fpp cloc htop ctop shellcheck mycli

brew tap homebrew/command-not-found

A curated list of AWS resources to prepare for the AWS Certifications

A curated list of awesome AWS resources you need to prepare for the all 5 AWS Certifications. This gist will include: open source repos, blogs & blogposts, ebooks, PDF, whitepapers, video courses, free lecture, slides, sample test and many other resources.

CSS `:focus` Selector

The :focus selector is used to select the element that has focus. It is allowed on elements that accept keyboard events or other user inputs.

HTMLInputElement
HTMLSelectElement
HTMLTextAreaElement
HTMLAnchorElement
HTMLButtonElement
HTMLAreaElement

CRUD with Ember (+ Data)

Ember's official documentation describes a number of low-level APIs, but doesn't talk much about how to put them together. As a result, a simple task such as creating a simple CRUD application is not obvious to a newcomer.

Using Python 3 + Google Cloud Vision API's OCR to extract text from photos and scanned documents

Just a quickie test in Python 3 (using Requests) to see if Google Cloud Vision can be used to effectively OCR a scanned data table and preserve its structure, in the way that products such as ABBYY FineReader can OCR an image and provide Excel-ready output.

The short answer: No. While Cloud Vision provides bounding polygon coordinates in its output, it doesn't provide it at the word or region level, which would be needed to then calculate the data delimiters.

On the other hand, the OCR quality is pretty good, if you just need to identify text anywhere in an image, without regards to its physical coordinates. I've included two examples:

####### 1. A low-resolution photo of road signs

	" ==============================================================================
	" Author: Alan Dong
	" Version: 0.3.5
	" Last Modified Date: 8/17/2018
	" Description: My Vim Configuration file
	" ==============================================================================

	" set shell for bash as default
	set shell=/bin/bash

	var assert = require('assert')
	var util = require('util')

	function test (inherits) {
	function Fruit () {

	}
	Fruit.prototype.round = false
	Fruit.prototype.sweet = true
	Fruit.prototype.eat = function () {}

	/*
	Let us re-create `Promise.all`

	`Promise.all` method returns a promise that resolves when all of the promises in the iterable argument have resolved,
	or rejects with the reason of the first passed promise that rejects.

	Read more about `Promise.all` on MDN: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all

	A basic example would be something like this:

	g=git
	ga='git add'
	gaa='git add --all'
	galias='alias \| grep git'
	gapa='git add --patch'
	gb='git branch'
	gba='git branch -a'
	gbda='git branch --merged \| command grep -vE "^(\\|\smaster\s*$)" \| command xargs -n 1 git branch -d'
	gbl='git blame -b -w'
	gbnm='git branch --no-merged'