igor sotsugov

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

Array

Definition:

Stores data elements based on an sequential, most commonly 0 based, index.

	from django.contrib.sessions.backends.base import SessionBase, CreateError
	from django.conf import settings
	from django.utils.encoding import force_unicode
	import redis

	class SessionStore(SessionBase):
	""" Redis store for sessions"""

	def __init__(self, session_key=None):
	self.redis = redis.Redis(

	#! /usr/bin/env python

	import redis
	import random
	import pylibmc
	import sys

	r = redis.Redis(host = 'localhost', port = 6389)
	mc = pylibmc.Client(['localhost:11222'])

	from selenium.webdriver import ActionChains

	class Select2(object):
	def __init__(self, element):
	self.browser = element.parent
	self.replaced_element = element
	self.element = browser.find_element_by_id(
	's2id_{0}'.format(element.get_attribute('id')))

	def click(self):

	"""
	This file contains code that, when run on Python 2.7.5 or earlier, creates
	a string that should not exist: u'\Udeadbeef'. That's a single "character"
	that's illegal in Python because it's outside the valid Unicode range.

	It then uses it to crash various things in the Python standard library and
	corrupt a database.

	On Python 3... well, this file is full of syntax errors on Python 3. But
	if you were to change the print statements and byte literals and stuff:

	from dateutil.parser import parse
	from pytz import utc

	datestr = 'Fri, 24 Apr 2015 14:49:32 -0400'
	dt = parse(datestr)
	utc_dt = dt.astimezone(utc)
	final = utc_dt.replace(tzinfo=None)

	"""
	if we list all the natural numbers below 10 that are multiples of 3 or 5, we get
	3, 5, 6 and 9. The sum of these multiples is 23.
	"""

	cap = 1000
	total = 0

	for i in range(1,cap):

	"""
	Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
	BSD License
	"""
	import numpy as np

	# data I/O
	data = open('input.txt', 'r').read() # should be simple plain text file
	chars = list(set(data))
	data_size, vocab_size = len(data), len(chars)