BolajiOlajide

#!/bin/python3
"""
A Python script to delete tweets.

• It uses tweet ids from a Twitter archive to bypass the Twitter API limit. Use this script if you need to delete more
than 3200 tweets and what's in your archive is a tweets.csv file.

• If you have more than 3200 tweets but your archive has a tweets.json file use this:
https://gist.github.com/flesueur/bcb2d9185b64c5191915d860ad19f23f

BolajiOlajide

- addons.js
- config.js
- webpack.config.js

BolajiOlajide

After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
brew unlink postgresql
brew install postgresql@9.6
brew unlink postgresql@9.6
brew link postgresql

BolajiOlajide

# Kill rails server and guard
bin/spring stop
brew services stop mysql
brew uninstall mysql
brew install mysql@5.5
brew link mysql@5.5 --force
brew services start mysql@5.5
rbenv uninstall 2.3.3
rbenv install 2.3.3
gem install bundle

BolajiOlajide

==========================================        	
             BASH SCRIPTING                       	==========================================
==========================================        	             TEST COMMAND
                                                  	==========================================
Invoke:      bash [options] file                  	
Shebang:     #!/usr/bin/env bash                  	Test:        test expression
                                                  	  In script: [ expression ]
==========================================        	  Alternate: [[ espression ]]
             LOOP                                 	             Does not split string words
==========================================        	             Does not expand pathglobs*

BolajiOlajide

# we need 2 helper mappings, from letters to ints and the inverse
L2I = dict(zip("ABCDEFGHIJKLMNOPQRSTUVWXYZ",range(26)))
I2L = dict(zip(range(26),"ABCDEFGHIJKLMNOPQRSTUVWXYZ"))

key = 3
plaintext = "DEFEND THE EAST WALL OF THE CASTLE"

# encipher
ciphertext = ""
for c in plaintext.upper():

BolajiOlajide

How do I round to 2 decimals?

In python, you have floats and decimals that can be rounded. If you care about the accuracy of rounding, use decimal type. If you use floats, you will have issues with accuracy.

All the examples use demical types, except for the original value, which is automatically casted as a float.

To set the context of what we are working with, let's start with an original value.

Original Value

BolajiOlajide

Afghanistan
Albania
Algeria
Andorra
Angola
Antigua & Deps
Argentina
Armenia
Australia
Austria

BolajiOlajide

function go() {
  var userId = prompt('Username?', 'Guest');
  checkIfUserExists(userId);
}

var USERS_LOCATION = 'https://SampleChat.firebaseIO-demo.com/users';

function userExistsCallback(userId, exists) {
  if (exists) {
    alert('user ' + userId + ' exists!');

BolajiOlajide

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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