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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:

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#
# I would expect entries in the stop_times.txt file to be unique when grouped by `trip_id` and `stop_id`.
#
# Indeed, of the current file's 520 entries, 510 are unique, but 10 are not (5 groups of 2).
#
# The following data structure contains entries from stop_times.txt grouped by `trip_id` and `stop_id`.
# 
# My question is, are these entires duplicative or do they have some significance?
#
# Thank you!

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# resources:
#   + https://www.tutorialspoint.com/python/python_gui_programming.htm
#   + https://www.tutorialspoint.com/python/tk_radiobutton.htm
#   + https://www.tutorialspoint.com/python/tk_entry.htm

from Tkinter import *

window = Tk()

#

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# prompt:
#   Joe's Automotive performs the following routine maintenance services:
#     + Oil change - $30.00
#     + Lube job - $20.00
#     + Radiator flush - $40.00
#     + Transmission flush - $100.00
#     + Inspection - $35.00
#     + Muffler replacement - $200.00
#     + Tire rotation - $20.00
#   Write a GUI program with check buttons that allow the user to select any or all of these services.

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#
# example using recursion, but output is reversed
#

def print_stars_desc(n):
    print(str(n) + " stars: " + (n * "*"))
    if n > 1:
        print_stars_desc(n - 1)

print("")

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class Person:
    def __init__(self, name, address, phone):
        self._name = name
        self._address = address
        self._phone = phone

#boy = Person("Jake", "123 Main Street", "123-456-7890")
#print(boy._name, boy._address, boy._phone)

class Customer(Person):

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class Employee:
    def __init__(self, name, number):
        self._name = name
        self._number = number

#employee = Employee("Mike", "123")
#print(employee._name, employee._number)

class Supervisor(Employee):
    def __init__(self, name, number, annual_salary, bonus):

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# resources:
#   https://docs.python.org/3/tutorial/classes.html
#   https://www.tutorialspoint.com/python/python_classes_objects.htm
#   https://learnpythonthehardway.org/book/ex40.html

class Pet:

    # expects to be instantiated using a dictionary like ...
    # pet = Pet({'name':'Kirby', 'type':'Dog', 'age':'really old'})
    def __init__(self, options):

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import os
import pickle # reference: https://wiki.python.org/moin/UsingPickle

#
# Write a program that keeps names and email addresses in a dictionary as key-value pairs.
# Each time the program starts, it should retrieve the dictionary from the file and unpickle it.
#

ADDRESS_BOOK_FILE_NAME = os.path.join(os.path.dirname(__file__), "address_book.p")

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from random import shuffle

state_capitals = {
  "Alaska":	"Juneau",
  "Arizona": "Phoenix",
  "Arkansas": "Little Rock",
  "California": "Sacramento"
} # todo: get the rest from the internet