[Python] How do I add cover image to a mp3 file using mutagen in Python?

The code below doesnt seem to update the artwork of the mp3 file. Code:-

from mutagen.id3 import ID3, APIC
audio = ID3(musicFilename)
with open(coverFilename, 'rb') as albumart:
print albumart.read()
audio['APIC'] = APIC(
encoding=3,
mime='image/jpeg',
type=3, desc=u'Cover',
data=albumart.read()
)
audio.save()


After running the script, the cover of the mp3 file remain empty.

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