Need to use a class to describe information of each media file returned

[jtara1]

Right now I'm using this JSON compatible structure that'll look something like this:

    expected_data = [
        [abspath('tests/media/about.txt'),
         {'General': {'duration': None, 'format': None, 'size': (None, None)}},
         1513722595.3195267],
        [abspath('tests/media/044838940-mountain-range-and-lake-2006-a.jpg'),
         {'General': {'duration': None, 'format': 'JPEG',
                      'size': (None, None)},
          'Image': {'duration': None, 'format': 'JPEG', 'size': (800, 536)}},
         1513722595.3235266],
        [abspath('tests/media/044837513-two-women-walking-hill-1930s-v.jpg'),
         {'General': {'duration': None, 'format': 'JPEG',
                      'size': (None, None)},
          'Image': {'duration': None, 'format': 'JPEG', 'size': (1024, 772)}},
         1513722595.3275266],
        [abspath('tests/media/045844231-my-mother.wav'),
         {'Audio': {'duration': 12863, 'format': 'PCM', 'size': (None, None)},
          'General': {'duration': 12863, 'format': 'Wave',
                      'size': (None, None)}},
         1513722595.3315265]
    ]

but I'd like to organize info of each file to be described in a class that has attributes like audio and inherits from the ABC MutableMapping so I can do media.get_info()['audio'] or media.get_info().audio