video = {'betaVideo':'beta.avi', 'motionVideo':'motion.mp4', 'videoLength':12}

video['betaVideo'] --> 'beta.avi'

video.get('betaVideo') --> 'beta.avi'

video['check'] --> 'KeyError: 'check''

video.get('check') --> None

video.get('check', 'nothing') --> 'nothing'

video['betaVideo']='test.avi'

--> {'videoLength': 12, 'motionVideo': 'motion.mp4', 'betaVideo': 'test.avi'}

videoFile['director']='sboku'

-->{'director': 'sboku', 'videoLength': 12, 'motionVideo': 'motion.mp4', 'betaVideo': 'test.avi'}

video = dict(betaVideo='betaVideo.avi', motionVideo='motionVideo.mp4', videoLength=100)

-->

{'betaVideo': 'betaVideo.avi', 'motionVideo': 'motionVideo.mp4', 'videoLength': 100}

author = {'Author':'sboku'}

video.update(author)

-->

{'betaVideo': 'betaVideo.avi', 'motionVideo': 'motionVideo.mp4', 'videoLength': 100, 'Author': 'sboku'}

video.keys()

--> dict_keys(['betaVideo', 'motionVideo', 'videoLength', 'Author'])

video.values()

--> dict_values(['betaVideo.avi', 'motionVideo.mp4', 100, 'sboku'])

video.items()

--> dict_items([('betaVideo', 'betaVideo.avi'), ('motionVideo', 'motionVideo.mp4'), ('videoLength', 100), ('Author', 'sboku')])