import music_tag

f = music_tag.load_file("music-tag/sample/440Hz.m4a")

# dict access returns a MetadataItem
title_item = f['title']

# MetadataItems keep track of multi-valued keys
title_item.values  # -> ['440Hz']

# A single value can be extracted
title_item.first  # -> '440Hz'
title_item.value  # -> '440Hz'

# MetadataItems can also be cast to a string
str(title_item)  # -> '440Hz'

# tags can be set as if the file were a dictionary
f['title'] = '440Hz'

# additional values can be appended to the tags
f.append_tag('title', 'subtitle')
title_item.values  # -> ['440Hz', 'subtitle']
title_item.first  # -> '440Hz'
title_item.value  # -> '440Hz, subtitle'
str(title_item)  # -> '440Hz, subtitle'

del f['title']
f.remove_tag('title')

# get artwork
art = f['artwork']

# Note: `art` is a MetadataItem. Use ``art.value`` if there is
#       only one image embeded in the file. This will raise a
#       ValueError if there is more than one image. You can also
#       use ``art.first``, or iterate through ``art.values``.

art.first.mime  # -> 'image/jpeg'
art.first.width  # -> 1280
art.first.height  # -> 1280
art.first.depth  # -> 24
art.first.data  # -> b'... raw image data ...'

# set artwork
with open('music_tag/test/sample/imgA.jpg', 'rb') as img_in:
    f['artwork'] = img_in.read()
with open('music_tag/test/sample/imgB.jpg', 'rb') as img_in:
    f.append_tag('artwork', img_in.read())

# Make a thumbnail (requires Pillow)
art.first.thumbnail([64, 64])  # -> pillow image
art.first.raw_thumbnail([64, 64])  # -> b'... raw thumbnail data ...'

# finally, you can bounce the edits to disk
f.save()