yazinsai

PostgreSQL JSON Cheatsheet

Using JSON in Postgres by example.

Quick setup via Docker

1. Download and install: Docker Toolbox
2. Open Docker Quickstart Terminal
3. Start a new postgres container:
   docker run --name my-postgres -e POSTGRES_PASSWORD=mysecretpassword -d postgres

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Getting the Android Emulator running on EC2 📱

# @ your EC2 instance
sudo apt update
sudo apt install openjdk-8-jre unzip
wget https://dl.google.com/android/repository/sdk-tools-linux-4333796.zip
unzip sdk-tools-linux-4333796.zip -d android-sdk
sudo mv android-sdk /opt/
export ANDROID_SDK_ROOT=/opt/android-sdk

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#!/bin/sh
if test -t 1; then  exec 1>/dev/null
fi
if test -t 2; then  exec 2>/dev/null
fi
"$@" &

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'''
This is an example of how to send data to Slack webhooks in Python with the
requests module.

Detailed documentation of Slack Incoming Webhooks:
https://api.slack.com/incoming-webhooks
'''
import requests

# Set the webhook_url to the one provided by Slack when you create the webhook at 

yazinsai

Keybase proof

I hereby claim:

• I am yazinsai on github.
• I am yazin (https://keybase.io/yazin) on keybase.
• I have a public key whose fingerprint is 0D54 C43C 6D83 3AEE 0E44 32DE C193 119E 305E D218

To claim this, I am signing this object:

yazinsai

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

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/*
Coded by Marjan Olesch
Sketch from Insctructables.com
Open source - do what you want with this code!
*/
#include <Servo.h>

int PIN_ESC = 9, value = 0;
Servo srvESC;

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/*====================================================================================================================================*
  ImportJSON by Trevor Lohrbeer (@FastFedora)
  ====================================================================================================================================
  Version:      1.2.1
  Project Page: http://blog.fastfedora.com/projects/import-json
  Copyright:    (c) 2012-2013 by Trevor Lohrbeer
  License:      GNU General Public License, version 3 (GPL-3.0) 
                http://www.opensource.org/licenses/gpl-3.0.html
  ------------------------------------------------------------------------------------------------------------------------------------
  A library for importing JSON feeds into Google spreadsheets. Functions include:

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yazinsai

# y = theta_1 * x + theta_0
# Not actually required in the gradient descent calculation; just used to verify
# the sanity of the results :)
def compute_error_for_line_given_points(theta_0, theta_1, points):
  totalError = 0
  for i in range(0, len(points)):
      x = points[i, 0]
      y = points[i, 1]
      totalError += (y - (theta_1 * x + theta_0)) ** 2
  return totalError / (2 * float(len(points)))