internaut

"""
Shows how to do a cross join (i.e. cartesian product) between two pandas DataFrames using an example on
calculating the distances between origin and destination cities.

Tested with pandas 0.17.1 and 0.18 on Python 3.4 and Python 3.5

Best run this with Spyder (see https://github.com/spyder-ide/spyder)
Author: Markus Konrad <post@mkonrad.net>

April 2016

mlynch

Single Page Apps are ruling the world and AngularJS is leading the charge. But many of the lessons we learned in the Web 2.0 era no longer apply, and few are as drastically different as authentication.

CORS

CORS is an oft-misunderstood feature of new browsers that is configured by a remote server. CORS stands for Cross-Origin-Resource-Sharing, and was designed to make it possible to access services outside of the current origin (or domain) of the current page.

Like many browser features, CORS works because we all agree that it works. So all major browsers like Chrome, Firefox, and IE support and enforce it. By using these browsers, you benefit from the security of CORS.

That means certain browsers do not enforce it, so it is not relevant there. One large example is a native Web View for things like Cordova and Phonegap. However, these tools often have configuration options for whitelisting domains so you can add some security that way.

rabbitt

import psycopg2 as pg

from io import BytesIO
from collections import defaultdict
from contextlib import contextmanager
from psycopg2.extensions import ISOLATION_LEVEL_AUTOCOMMIT, ISOLATION_LEVEL_READ_COMMITTED

READ_COMMIT = ISOLATION_LEVEL_READ_COMMITTED
AUTO_COMMIT = ISOLATION_LEVEL_AUTOCOMMIT

craigvantonder

#!/bin/bash

# NB: First install nscd with sudo apt-get install nscd

# run this command to flush dns cache:
sudo /etc/init.d/dns-clean restart
# or use:
sudo /etc/init.d/networking force-reload
# Flush nscd dns cache:
sudo /etc/init.d/nscd restart

statico

How to use a PS3 controller on Mac OS X 10.7 (Lion)

1. Open Apple menu -> System Preferences -> Bluetooth and disable Bluetooth on Mac as well as any other nearby Macs or devices which will try to pair with and confuse the controller.

2. Reset PS3 controller by inserting paperclip into pinhole near L2 button.

3. Connect PS3 controller to Mac with USB cable.

4. Enable Bluetooth.

littlemove

;; Code folding
(add-hook 'ruby-mode-hook
          (lambda () (hs-minor-mode)))

(eval-after-load "hideshow"
  '(add-to-list 'hs-special-modes-alist
                `(ruby-mode
                  ,(rx (or "def" "class" "module" "do" "{" "[")) ; Block start
                  ,(rx (or "}" "]" "end"))                       ; Block end
                  ,(rx (or "#" "=begin"))                        ; Comment start

scy

How to delete a file from a Git repository, but not other users' working copies

Suppose you have, by mistake, added your IDE's project folder (you know, these .idea folders with all kinds of local paths and configuration data and settings in it) to the Git repository of your project. (We're talking about a whole folder here, but the same rules apply to individual files as well.)

Of course, you only realize that two days after the fact and have already pushed it, and your colleagues have already pulled it. They use the same IDE as you do, so whenever they change a setting or fix paths, they can either

• commit that, causing nasty merge conflicts for you and others or
• ignore the changes and carry around a modified file until the end of time without ever committing it.

Why .gitignore won't help

macagua

mkdir -p ~/.conda/pkgs && printf 'pkgs_dirs:\n   - ~/.conda/pkgs\n' >> ~/.condarc

borkdude

#!/usr/bin/env bash
set -eo pipefail

CERT_FILE="./certs/dev/dev-ca/rootCA.pem"
CERT_NAME="Nextjournal Development Root CA"

echo "Installing development Root CA into system store..."

if uname -a | grep -q Darwin; then
  sudo security add-trusted-cert -d -r trustRoot -k /Library/Keychains/System.keychain $CERT_FILE

jhngrant

# PostgreSQL can be on a remote server but you'll need root privileges in Linux and superuser in PostgreSQL.

# First install build tools

sudo su
aptitude install build-essential
aptitude install postgresql-server-dev-9.4

# Clone and build the PL/pgSQL server-side debugger