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*.c     diff=cpp
*.h     diff=cpp
*.c++   diff=cpp
*.h++   diff=cpp
*.cpp   diff=cpp
*.hpp   diff=cpp
*.cc    diff=cpp
*.hh    diff=cpp
*.cs    diff=csharp
*.css   diff=css

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def extract_values(obj, key):
    """Recursively pull values of specified key from nested JSON."""
    arr = []

    def extract(obj, arr, key):
        """Return all matching values in an object."""
        if isinstance(obj, dict):
            for k, v in obj.items():
                if isinstance(v, (dict, list)):
                    extract(v, arr, key)

numberwhun

Download Audio from YouTube

-i - ignore errors

-c - continue

-t - use video title as file name

--extract-audio - extract audio track

numberwhun

VirtualBox Host-Only Static IP

My typical setup for a development box in VirtualBox uses two NICs. The first uses NAT to allow the box to communicate with the outside world through my host computer’s network connection. (NAT is the default, so shouldn't require any setup.) The second is a "host-only" connection that allows my host and guest to interact.

To create a host-only connection in VirtualBox, start by opening the preferences in VirtualBox. Go to the "Network" tab, and addd a Host-only Network. Modify the host-only network, and disable DHCP. Make a note of the IP address. (Feel free to set the IP address as well, if you like.)

Next, assign this host-only adapter to the virtual machine. Select the VM and press "Settings". Go to the "Network" tab, and select "Adpater 2". Enable the adapter, set it to a "Host-only Adapter", and select the adpater you created above.

Temporary

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# Caesar cipher encoding
echo "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG" | tr '[A-Z]' '[X-ZA-W]'
# output: QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD

# Caesar cipher decoding
echo "QEB NRFZH YOLTK CLU GRJMP LSBO QEB IXWV ALD" | tr '[X-ZA-W]' '[A-Z]'
# output: THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG


# Can also be adjusted to ROT13 instead

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#System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

##Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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Transforming Code into Beautiful, Idiomatic Python

Notes from Raymond Hettinger's talk at pycon US 2013 video, slides.

The code examples and direct quotes are all from Raymond's talk. I've reproduced them here for my own edification and the hopes that others will find them as handy as I have!

Looping over a range of numbers

for i in [0, 1, 2, 3, 4, 5]:

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to create a new environment

  conda create -n mynewenviron package1 package2 etc
  conda create -n newenv --clone ~anaconda  
  
to remove an environment

  conda remove -n myenvirontoremove --all
  
always start with

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#!/bin/bash

NAME=Phil Tysoe
[email protected]
SUBLIME_TEXT_2_DOWNLOAD_URL=http://c758482.r82.cf2.rackcdn.com/Sublime%20Text%202.0.1%20x64.tar.bz2
ECLIPSE_DOWNLOAD_URL=http://www.mirrorservice.org/sites/download.eclipse.org/eclipseMirror/eclipse/downloads/drops4/R-4.2.2-201302041200/eclipse-SDK-4.2.2-linux-gtk-x86_64.tar.gz

# setup ssh key
ssh-keygen -t rsa -C "${EMAIL}"
cat ~/.ssh/id_rsa.pub

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 #color and git branch
 parse_git_branch() {··
   git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
 }
 export CLICOLOR=1
 export GREP_OPTIONS="--color"
 export LSCOLORS=gxfxcxdxbxegedabagacad
 
 PS1='\n\[\e[1;36m\]\w \[\e[m\]\[\e[1;33m\]$(parse_git_branch)\[\e[m\] \n> '